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ATENA Program Documentation Part 8 User`s Manual for ATENA

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1. It is done by selecting icon SL Toggle between pre and postprocess see Fig 10 7 After that a dialog window appears and the button OK should be pressed The program switches into pre processing Then the command Data Problem Data Post Data can be selected in the main menu and a window for the definition of the post data will appear see Fig 10 8 This dialog you can run directly by clicking to icon in postprocessor ATENA GiD 52 GiD AtenaV4 Static 2D and 3D Interface Project AtenaResults Files View Utilities Do cuts View results Options Window Help PIST ERENER il s x Toggle between pre and postprocess me B i gg p dll This icon should be selected to switch between pre and post processing NWE dy z gt fb IMT T LE IS x 7 L COD1 0 0005707 0 00050729 0 00044388 0 00038047 0 00031706 0 00025364 0 00019023 0 00012682 6 3411e 05 0 a T 1 J A A B p gt ey b ES Ey SL U gt CITE e v i PS k x step 35 Contour Fill of CRACK WIDTH COD1 Selected new analysis and step Contour Fill COD1 Min 0 Max 0 0005707 Command l Fig 10 7 Switch between pre and postprocessing Post data General l Load and Forces l Strain stress je CRACK WIDTH hf DISPLACEMENTS EIGENVECTORS IMPERFECTIONS PERFORMANCE INDEX PHYSICAL PARAMETERS SOFT HARD PARAMETER CURRENT NODAL COORDINATES REFERENCE NODAL COORDINATES Close
2. Fig 10 8 The selection of the data which should be available for the post processing For example the FRACTURE STRAIN can be chosen The definition of post data is completed by selecting Accept button see Fig 10 9 Then the button Close can be pressed and the GiD will switch to post process automatically But there in the post process the data from AtenaWin has to be imported again a It is done by the clicking on the AtenaWin icon Then the FRACTURE STRAIN can be found in the options for the post processing see Fig 10 10 to obtain this figure the 35 step has to be selected again 53 User s Manual Post data General Load and Forces strain Stress ELEM INIT STRAIN INCA ED PLASTIC STRAIN EXTERNAL CABLE SLIPS FRACTURE STRAIN MAKSIMAL FRALT STRAIN PLASTIC STRAIN PRINCIPAL FRACTURE STRAIN PRINCIPAL PLASTIC STRAIN PRINCIPAL SHELL MEMBRANE m Tra Aiki if UE I Options Window Help B D Re Ei BS Gil Versions No Graphs 2 f Default Analysis Step CRACKWIDTH Par Smooth Contour Fill gt DISPLACEMENTS gt Pr b EEE T Contour Lines gt lt FRACTURE STRAIN gt eps f xx 9 Cy Contour Ranges gt STRAIN eps f yy iE V Show Min Max gt STRESS b epstzz A xs Display Vectors gt gamma f xy a F aX jet Iso Surfaces gamma f yz a Ai uae Zx Stream Lines gamma f xz ie zs Graphs gt Si FRACTURE STRAIN g x Resu
3. 10 5 The selection of the step which should be post processed 51 User s Manual By the clicking on the Contour fill icon or by the selecting the command from main menu View results Contour Fill CRACK WIDTH COD1 crack width can be displayed see Fig 10 6 GiD AtenaV4 Static 2D and 3D Interface Project AtenaResults Files View Utilities Do cuts MENTES Options Window Help EON PTY O in No Results ZB 2 Gil versen 9 No Graphs Default Analysis Step P DISPLACEMENTS COD2 STRAIN COD3 STRESS CRACK WIDTHI Smooth Contour Fill Contour Lines Contour Ranges Show Min Max Display Wectors Iso Surfaces Stream Lines Graphs Result Surface ES Deformation T P P YY F E T F TTT PF Line Diagram A LT j A IX i od fn f gt j tales COD1 0 0005707 0 00050729 0 00044388 0 00038047 0 00031706 0 00025364 0 00019023 The message window shows maximum podi u e and minimum crack width z o EN M a des Contour Fill of CRACK WIDTH COD1 Selected new analysis and step Contour Fill CODI Min 0 Max 0 0005707 Command Fig 10 6 The display of the crack width In the command Contour Fill the pull down menu offers options which can be displayed Currently rather limited set of quantities is available however much more result types are available in ATENA To be able to visualize these additional quantities the program has to be switched to pre processing
4. 2 Fig 5 26 Creating a contact surface Steps 1 2 Step 3 Select Utilities Swap Normals Lines to check the interface line vectors If needed change the vector directions on the interface lines so that each ones points to the other surface Step 4 Move the displaced surface back with the option duplicate entities checked Notice the overlapping labels of the interface lines and points ARRE PE AE PEPE SERRE ma LL EB je l mm sk MNE ed 4 Fig 5 27 Creating a contact surface Steps 3 4 Step 5 Select Geometry Create Contact surface and select the two interface lines 3 and 10 in order to create the new contact surface 3 Assign the interface material to this contact surface by selecting Data Materials Interface Step 6 Ensure mesh compatibility for the two interface lines 3 and 10 The interface creation 1s now complete 27 User s Manual BA EREEREER 100 0 ld k a AAA TI E M PR ey Fig 5 28 Creating a contact surface Steps 5 6 The procedure for a 3D interface is essentially the same considering surfaces and volumes instead of lines and surfaces respectively and replacing the creation command in Step 5 by Geometry Create Contact Volume 5 4 Interval data Loading history GID recognizes Intervals which approximately correspond to Load steps in ATENA The Interval data concept of GiD is used to define the loading history of the
5. ATENA GiD 16 SHELL Concrete Steel ES Shell Loncrete Steel e xe k Basic Local Coordinate System Base Remforcement UI Reinforcement 02 Element Geometry Geometrical Non Lineanty LINEAR Initial Strain Application DEFAULT PROCESSING Initial Stress Application DEFAULT PROCESSING Element Type CCA4AmadeE lement32H9 Allow Shell Deformation in Z Idealization SHELL Unaesign Exchange Fig 5 11 Shell material properties Element Geometry 7 SHELL Concrete Steel tc 755 Basic Normal direction of Plane Solid Reinforcement 01 Element Geometry Reinf 01 Material Prototype CCSmearedReinf Reinf 01 Layers fi Reinf 01 Localization Top Reinf 01 Calculator Reinf 01 Reinforcement Distance From aoa Surface 0 033 4 Materna Reinf 01 Area 0 000201061 m Reinf 01 Young s Modulus E 2 0E 5 MPa Reinf 01 Dir X of the smeared reinf 1 Reinf 01 Dir Y of the smeared reint 0 Reinf DI Dir Z of the smeared reinf 0 Reinf 01 Yield Strength Ys 550 MPa Reinf 01 Number of Multilinear values 2 Reinf 01 eps2 0 0235 Reinf 01 f2 573 MPa ReinfOleps3 0 ReinfO1 falo MPa ReinfOleps4 0 Reinf 01 f4 0 MPa Reinf 01 eps5 0 Reint 01 slo MPa MN Reinf 01 RHO Density 0 0785 m ad to k Reinf 01 Thermal Expansion Alpha 0 000012 Assign Unassign Exchange Fig 5 12 Shell material properties Reinforcement 17 User s Manual SHELL Concrete Steel ShellConcieteSteel RDR
6. ERVENKA CONSULTING Cervenka Consulting Ltd Na Hrebenkach 55 150 00 Prague Czech Republic Phone 420 220 610 018 E mail cervenka cervenka cz Web http www cervenka cz ATENA Program Documentation Part 8 User s Manual for ATENA GiD Interface Written by Vladim r ervenka Jan ervenka and Zden k Janda Prague 8 2 2011 Trademarks ATENA is registered trademark of Vladimir Cervenka GiD is registered trademark of CIMNE of Barcelona Spain Microsoft and Microsoft Windows are registered trademarks of Microsoft Corporation Other names may be trademarks of their respective owners Copyright 2000 2011 Cervenka Consulting Ltd User s Manual for ATENA GiD Interface CONTENTS 1 INTRODUCTION rincon 00 Us ods ddd uza g u a a 1 Z JOVERVIEW o a asa ssa az oz da 2 2 1 VU OER G IG A PRO PROP POE E ia 2 2 2 Limitations of ATENA GiD interfaCe ooocooononoononncononncononncononnconcnnconnnnconnoncoononacoconncononncnnons 2 3 GIDINSTALLATION AND REGISTRATION 000eoeoeoeoeoeoeoeoeseseoeoeoesesesesesesesesesesesesesesesesesesese0 3 A ATENA GID INSTALLATION i ia i Gaia ka os ka kesa as ao osa oa do bd ob able sb iso Ra so aso a k so Ga sb s s da sd l k 5 5 ATENA SPECIFIC COMMANDS cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccocses 6 5 1 PODIEN E ao 6 5 2 CONIUGI 26s A A A ata A 6 5 3 Material iii tau at tat tt it ata ela na it kb oo ono 8 SS ASIC o dd de
7. Normalize Eigenvectors Stiffness Type Tangent Predictor 4 Shift Eigenvalues 0 0 Assemble Stiffness Matrix Each Iteration Solver LU W Line Search Method Line Search With Iterations Line Search With Iterations Unbalanced Eneray Lirnit 0 8 Line Search Iteration Limit 3 Minimum Eta 0 1 Maximum Eta 1 Close Close Fig 5 29 Load steps intervals 5 5 Problem Data The solution parameters such as number of iterations convergence criteria or the solution methods for an ATENA analysis are defined in the menu item Data Problem Data Fig 5 30 or icon F The dialog window is opened and default data are offered At the top section Task name can be any name chosen by user and it affects the naming convention which is used for the generated input file or other working files for the ATENA analysis 29 User s Manual Problem type k Conditions Materials k Interval Data Problem Data Data units Interval k Local axes l Fig 5 30 Problem Data The middle section covers the solution parameters for non linear methods Their proper choice 1s important for a successful analysis The meaning of solution parameters can be found in the ATENA documentation Part 1 Theory 1 and Part 2 Users Manual 2 The last section in bottom of this window makes 1t possible to generate a load history of identical load steps In this case the box in front of Automatic gen Load Step 1s checked and n
8. details see Theory Manual Shell material can be used only on 3D quadratic brick elements 5 8 BEAM Concrete Beam Concrete CCBeam3DMaterial Special material which activates the usage of special fiber beam element suitable for large scale analysis of complex structures with large elements The element is based on a similar beam element from BATHE 1982 It is fully nonlinear in terms of its geometry and material response lt uses quadratic approximation of its shape so the it can be curvilinear twisted with variable dimensions of the cross sections Moreover beam s cross sections can be of any shape optionally even with holes The element belongs to the group of isoparametric elements with Gauss integration along its axis and trapezoidal Newton Cotes quadrature within the cross section The integration or material points are placed in a way similar to the layered concept applied to shell elements however the layers are located in both s directions Beam material can be used only on 3D quadratic brick elements 5 8 11 User s Manual 1D Reinforcement Ka Reinforcement EC2 CCReinforcement Material is like Reinforcement Vou can generate material properties according the EC2 AA Eora Material for discrete reinforcement Interface CC3DInterface Interface material for 2D and 3D analysis Spring Material CCSpringMaterial Material for spring type boundary condition elements i e for truss e
9. 13 A A IM G OTI A PR E P EA 19 5 3 3 Reinforced concrete o CORE O 22 534 Merac Matenal ik i e ao ree a eS 25 5 4 Interval data Loading hiStOrY sse sseesssesssessseessessseesseeseesseesseesssessseosseosseosseosseesseesseessees 28 5 5 Problem Data sarene A a too aa 29 5 6 a R O O O O P O OTA O LOCK 32 5 7 Finite Element MN do aL de 33 SIA NOS ON INCSINING e ar EO E 33 5 8 Finite Elements for ATENA uu ccccccccsccscssscsccsscsccescsscesssscssssscsssescsecsecsscsesssccasssssescsesenesees 34 6 STATICANALX SiS is 38 7 CREEP AND SHRINKAGE ANALYSIS ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccces 39 7 1 Boundary conditions and load cases related INpUt sssessessenzazzonnennznnnznzznnnznnznnta 40 7 2 Material iInputalata iaa 41 8 ANALYSIS OF MOISTURE AND HEAT TRANSPORT ccccccccccccccccccccccccccccccccccccccccccccccccccccccsese 44 9 DVNAMICANALVSIS nissan 47 10 POST PROCESSING IN ATENA GID cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccecs 49 11 USEFUL TIPS AND TRICKS sss edek edoni g da sa sad s odd a sa ods sV sa da od v o o d d o dd oak SV sd od datar sa sd nos da 6 55 11 1 ExportiXT for Atenas pre processor unio 55 12 EXAMPLE DATA FILES ct 56 13 CALCULATION OF ATENA IDENTIFICATION NUMBERS ccccccccccccccccccccccccccccccccccccccccccccccese 58 Add dd i el L A AT 60 i User s Manual ATENA GiD 1 INTRODUCTION Program
10. 3D triangular 12 node interface CCIsoGap lt xxxxxxxxxxxx gt 3D quadrilateral 8 node interface CCIsoGap lt xxxxxxxx gt 3D guadrilateral 16 node interface CCIsOGAp lt XXXXXXXXXXXXXXXX gt 37 User s Manual 6 STATIC ANALYSIS Static analysis is activated in GID by selecting an appropriate problem type Static see the menu items Data Problem Type AtenaV4 The making of model it s a same like others problem data Its neccessarry to assign Conditions 5 2 for each macroelement assign material properties 5 3 define the interval data 0 Fig 5 29 Fig 6 1 and problemtype properties Fig 5 31 meshing model 5 7 and execute program Sets number of the lowest eigenmodes that LRA NIE should be calculated Maximum eigenvalues error that is tolerated m n A Max number of subspace iterations Basic Parameters Eigenvalue Analysis Eign glug Flag for requesting Sturm check that no NUMBER OF EIGENYALS E eigenvalue got missed during the solution Max EIGENVAL ERROR 0 000001 M NUMBER OF SSPACE Max number of iteration within Jacobi The ITERATIONS 14 Jacobi procedure computes eigenmodes of the projected global eigenvalues problem via minimization of Rayleigh quotient Ww STURM SEQUENCE CHECK Mas NUMBER OF JACOBI Ar ITERATIONS Defines number of projection vector used by NUMBER OF PAO YECS 15 Ravleigh quotient method It must be equal or W NORMA
11. GiD can be used for the preparation of input data for ATENA analysis The program GiD is a universal adaptive and user friendly graphical user interface for geometrical modelling and data input for all types of numerical simulation programs It has been developed at CIMNE The International Center for Numerical Methods in Engineering http www cimne upc es in Barcelona Spain When using GiD for some graphic cards 1t may be necessary to switch off graphical acceleration Several scripts are created which enables to interface GID with ATENA Selecting an appropriate problem type in the G1D environment activates these scripts Problem types are compatible with GiD ver 7 7 2b and newer version 8 or 9 1s recommended e ATENAV4 Static static 2D and 3D analysis e ATENAV4 Creep creep 2D and 3D analysis e ATENAV4 Temperature transport 2D and 3D analysis e ATENAV4 Dvnamic dynamic 2D and 3D analysis They make it possible to define a finite element model within GID including specific data needed for ATENA and export it to AtenaWin 5 where a non linear analysis can be performed Visualization of ATENA results is also possible in G1D but can be done also in the Pre Post processor ATENA3D which is a powerful ATENA postprocessor This option is available only if ATENA Engineering is installed on your computer Alternatively results can be presented directly in AtenaWin 5 The problem types with the label ATENAV4 can be used with
12. automatically treated as reinforcement see page 6 Fig 5 32 Global options in problem data dialog Automatic Reinforcement Identification 31 User s Manual Problem Data This option is used when it is requested to exchange data with a transport analysis The location and names of the appropriate files can be specified here Problem Data Global Settings Global Options Transport Restart Calculation from Calculated Step wi Restart of Analysis Hestart azkName IdemoT azkM am Stored Step Far Restart 0 This option is used when it is requested to restart calculation from previous calcualted steps Fig 5 34 Restart calculation options in problem data dialog 5 6 Units Standard units in ATENA are SI units which are active automaticallv as a default unit set Fig 5 35 It 1s also possible to define other sets of units This can be done in the menu Data Data units where in the dialog window Problem units you can change the Base system The Model Unit always has to be selected consistently with the Units System Problem units Model Unit m Mesh Calculate B Units System Problem type Base System ATENA SI MM AND M Conditi S LENGTH m FORCE MN Materials d Interval Data TIME day TEMPERATURA L Problem Data k MASS klon Data units Interval d Accept Cancel Local axes d Fig 5 35 Data units default set In general the structural analysi
13. flash disk or your PC hard drive It is not your personal name After registering either a permanent or temporal password it 1s possible to generate and post process an unlimited number of nodes and elements ATENA GiD 4 4 ATENA GID INSTALLATION The installation of ATENA GiD interface can be also performed during ATENA installation During this process a user will need to confirm the location of GiD directory Alternatively the ATENA GID interface can be also installed manually as 1t is described in the following paragraphs After installing ATENA on your computer there should be a subdirectory GiD in the directory where ATENA is installed Please note that this subdirectory is installed only if the ATENA GID interface is selected during the installation If the subdirectory GiD does not appear in the ATENA directory the ATENA setup should be started again and ATENA GiD interface should be selected for installation On most computers the GID is installed in the directory C Program Files GiD GiDx x After installation of ATENA GID interface new problem types will appear in GiD The problem types are available under the GID menu Data Problem type 5 User s Manual 5 ATENA SPECIFIC COMMANDS 5 1 Problem type The program GID is a general purpose pre and post processing tool for variety of numerical problems and analysis software In this menu we can define a problem type which in our case is ATENA analysis This
14. i e material models This is done by implementing models for prediction of creep and shrinkage behaviour of concrete Such models are published in codes of practice for civil engineers and of course a few reputable models exist in scientific literature too For more information about implemented models please have a look at the theoretical manual for ATENA 1 There is one more thing worth of mentioning here In order to compute structural response at a specific time the whole history of the structure has to be analysed It involves time integration of structural behaviour which is done in numerical manner Practically it means that although the structure is typically loaded only in a few steps in order to ensure sufficient accuracy of the analysis each such a step is further subdivided by the ATENA kernel into several sub steps This process of step splitting is generated automatically bearing in mind exponential character of concrete creep and shrinkage 39 User s Manual behaviour and user need not to worry about any related details This means that in addition to the load steps which are predefined by the user additional sub steps are introduced automatically during the analysis in order to accurately consider the effect of the loading history This sub stepping process can be adjusted through a proper selection of the parameter SET SAMPLE TIME PER DECADE see the input dialog below It can be reached via the menu item Menu Da
15. is selected bv choosing one of the buttons e AE For each geometric entity an appropriate list of possible conditions can be unfolded and a required type of condition can be selected Example of the list for conditions in a point is shown in Fig 5 2 middle Applied conditions are then selected by filling the appropriate boxes Fig 5 2 right or by cond You can view all currently defined conditions in current interval by clicking m to icon ATENA GiD 6 Conditions E Conditions Problem type Constraint for Point r K A Load Force far Point Basic Displacement for Point l Spring far Point Coordinate System GLOBAL 011 Monitor for Point Conditions W Constraint W Constraint W Constraint Materials Interval Data Problem Data Data units lw Z Constraint W Constraint Assion Entities Draw Uhassign Entities Draw Unassign Interval k i Close Close Local axes b Fig 5 2 Conditions menu list at Point applied at Point Operation of condition assignment is done with the following buttons in the bottom of the dialog Assign The target of assignment command depends on the display type In case the geometry 1s displayed then geometrical objects point line surface can be selected and condition can be assigned to these entities In case the finite element mesh 1s displayed the condition can be assigned to element nodes Entities Shows a list of entities with a
16. material parameters solution methods This manual 1s focused on the later features The description of the general features of GID menu items View Geometry Utilities etc can be found in the GID documentation There 1s an extensive online help available in GID which is accessible from the menu Help as well as some online tutorials For example the information how to create geometry 1s not included in this manual and can be found in the GID menu Help Contents Geometry The practical aspects of the GiD use can be exercised on the examples described Chapter 5 2 2 Limitations of ATENA GiD interface It should be noted that ATENA GID interface supports the most common features of the ATENA software However the direct modification of the ATENA input file may be sometimes useful and it allows the user to exploit all the features of the ATENA software Detailed syntax of all ATENA commands is described in the ATENA documentation 4 This ATENA command file is typically generated by GID but it is a readable text file that can be further modified manually if needed ATENA GiD 2 3 GID INSTALLATION AND REGISTRATION G1D installation can be performed during ATENA installation or G1D can be separately downloaded from GiD developer at http www gidhome com In order to get the better of GID it is necessary to obtain a user license by purchasing the program from GID distributors in your country from Cervenka Consulting or di
17. the icon SOLID Concrete Bazant xi 1994 BOX weg Basic Initial Temperature Initial Humidity Element Geometry Maternal Prototype LLMadelb ad Concrete Type 1 Katia Wie 0 5 Cement weight 0 66 k Temp Temp 1 36 J L Temp Temp 20 0000 3 m Activate Function Initial Water State Humidity Assign Unassign Exchange Fig 8 1 Heat and moisture transport material model dialog The model name is CCModelBaX194 Its moisture transport part is based on Bazant X1 model see the manual for Atena theory 1 that has been developed for the modelling mortar behaviour It accounts for water and cement paste only and hence in case of ATENA GiD 44 concrete mixture it neglects the presence of aggregate Consequently the model can be used only when relatively impermeable aggregate with low absorption is used such as gravel etc On the other hand the model accounts for heat generated due to the process of hydration The heat transport related part of the model employs linear material law The input dialog from Fig 8 1 has several data sheets The first one refers to actual material parameters whilst the remaining sheets are used to define initial material conditions and their variation in space Taking example of data page for humidity it enlists parameters Humidity CONST h const Humidity COEFFX 4 Humidity COEFFY h Humidity COEFFZ h The actual initial humidity in a material point is
18. then computed as h h x h y h z h where x y z is vector of coordinates of the material const 2 point The same approach is used for setting initial conditions for initial temperature and moisture Note that moisture and humiditv conditions are mutuallv dependent Hence only one of these needs to be specified the others are calculated automatically Another data sheet which 1s specific to the transport analysis is described below Time step beginning xl k RI Problem Data Global Settings Time and Transport Theta parameter influencing the time CURRENT TRANSIENT TIME 0 0 day l l integration see 1 TIME INTEGRATION OF TRANSIENT CRANK NICHOLSON THETA OF CRANE NICHOLSON 0 7 e HISTORY OVERWRITE EXPORT EXPORT RESULTS TO c Demo_ Aesu EXPORT GEOMETRY TO c Demo_Geon File names including the path where the results of the transport analysis are stored and can be later imported and used in a subsequent stress analysis These export files are created only if the check box 1s selected Fig 8 2 Time and transport data sheet This sheet 1s invoked by pressing the icon 4 In addition to other parameters used for temporal integration 1t comprises names of files where the results of this analysis should be exported Note that History Overwrite Export checkbox must be checked The 1 of them contains actual humidity and temperature histories of the structure and the 2 file keeps inform
19. 23 Basic Mormal director of Plane Solid Reinforcement DI Element Geometry Kem 01 Maternal Prototype CCS mearedh emnt Rent 01 Layers l Localization of reinforcement Reint 01 Localization Top Reint 01 Calculator Reint 01 Reinforcement Distance From 0 033 m Surface A ple die Kent 01 Area 0 000201 061 m Reint 01 Young s Modulus E 12 05 5 MPa Reint 01 Dir of the smeared rent 11 ie Reinf 01 Dir T of the smeared reimt fr f Reinf 01 Dir of the smeared reimt i 3 Kem 01 field Strength rS 550 MPa Reinf 01 Number of Multilinear valuez 2 0Hd Number of value Reinf D1 eps2 0 025 Reinf 01 f2 578 MPa Reint D1 eps3 Renta MPa Reinf D1 eps4 l0 0 Reinf D1 jo MPa Reinf D1 eps5 jo Reinfor jo MPa MM Reinf 01 AHO Density 0 0785 Ta m Reint 01 Thermal Expansion 4lpha 0 00001 E AAA M Assign Draw Unagsign Exchange Description of used reinforcement Close Fig 5 13 Shell material properties Reinforcement detail ATENA GiD 18 5 3 2 Beam Material BEAM Concrete TS Basic Local Coordinate System Solid Reinforcement Element Geometry Material Prototype CCBeamaD M aterial Activate Solids i Activate Reinforcement 01 On this list you can activate reinforcement layers The new lists will be added to top row of list name Assign Unazsign Exchange Fig 5 14 Beam material prope
20. ATENA analysis The load step data include the definition of loading boundary conditions and solution methods to be used for a single analysis step It should be noted that all conditions that are created using the command Data Conditions see Chapter 5 2 are automatically inserted into the currently active interval By default it is the interval number 1 Each GiD Interval data can be used to generate multiple ATENA load steps This simplifies the model preparation if it is necessary to create many ATENA load steps with the same boundary and loading conditions The user should be aware of the fact that all ATENA loads or boundary conditions are treated in a purely incremental fashion This means that a force which is applied at certain load step 1s added to the forces applied previously If a force is to be removed the force with the same value but opposite sign should be applied in the model The definition of Interval data starts by selecting the menu item Data Interval Data or the icon This command opens the dialog window as shown in Fig 5 29 which can be used to specify the parameters for an individual interval In this dialog 1t for instance possible to define how many ATENA load steps should be generated with the same conditions and parameters or which scaling factor is to be applied to all conditions see Chapter 5 2 in the current interval An active Interval or a new Interval can be created using the menu Data Interv
21. ATENA version newer than 4 0 0 These problem types support ATENA analysis with two and three dimensional models In addition it is possible to perform stress creep thermal i e transport and dynamic analyses A demo version of GID limited to 3000 elements or 1010 nodes can be downloaded free of charge from http www gidhome com or from our web pages www cervenka cz This document describes the way how GiD can be used to generate data for ATENA analysis The emphasis is on ATENA oriented commands More details about the general use of GID can be found in the GiD documentation 1 User s Manual 2 OVERVIEW 2 1 Working with GiD The procedure of data preparation for ATENA with the help of GiD can be summarized in the following work sequence e Select one of the problem types in ATENAV4 e Create a geometrical model e Impose conditions such as boundary conditions and loading on the geometrical model e Select material models define parameters and assign them to geometry e Generate finite element mesh e Change or assign supports and loading conditions to the mesh nodes if necessary e Change or assign materials to individual finite elements if necessary e Create loading history by defining interval data e Execute finite element analysis with AtenaWin Some of the above actions are general and not dependent on ATENA geometry definition finite element mesh while the others are more or less specific for ATENA
22. ENT TIME 5 0 sec Fixed Moisture Dof This option can be used to generate several load steps with the same conditions Time increment which is to be specified for each generated step In case of multiple steps generation each step time increment will be assigned this value User Solution Parameters Solver LU When selected the transport of moisture 1 e humidity is not considered and only thermal analysis is performed M eee Accept Close Here direct or iterative solver can be selected If selected a new set of solution parameters can be specified for this and any subsequent intervals Fig 8 3 Step data dialog The remaining input data and corresponding data dialogs are similar to their form in other types of ATENA GID analysis They were already described earlier in this document see Section 0 ATENA GiD 46 9 DYNAMIC ANALYSIS Dynamic analysis is activated in GID by selecting an appropriate problem type Dynamic see the menu items Data Problem Type AtenaV4 The making of model it s a same like others problem data It is necessary to assign Conditions 5 2 for each macroelement assign material properties 5 3 define the interval data 0 and problemtype properties Fig 9 1 meshing model 5 7 and execute program Problem Data E Time step beginning Global Settings Global Options Time and Dynamic Restart Calicut Stop besos EE Time at which the CURRENT TRANSIENT TIME 0 0 sec e
23. LIZE EIGENYECTORS bigger than the number of required isenvaliles SHIFT EIGENVALUES 0 0 A Flag for request to normalize eigenvectors Value by which the structural f during iterations eigenvalues should be shifted Fig 6 1 Settings of EigenValue Analysis Detailed example of static analysis 1s at full length in ATENA Science example manual ATENA GiD 38 7 CREEP AND SHRINKAGE ANALYSIS This section describes use of GID graphic user interface to carry out creep and shrinkage analysis within Atena software The theoretical background for such an analysis is given in Atena Program Documentation Part 1 Theory 1 Here we will concentrate only on the explanation of the GUI support implemented in the GID environment For the exact meaning and deeper description of the individual input parameters the reader is referred to Atena Program Documentation Part 6 Input File Format Manual 4 The ATENA software supports two kinds of creep and shrinkage analysis The first kind involves only mechanical analysis of the structure It is assumed that the structure has everywhere more or less similar humidity and temperature conditions and the same applies for ambient environment The corresponding problem type for this kind of analysis is Creep and it 1s accessible via menu item Menu Data Problem type AtenaV4 The second kind of creep and shrinkage analysis is aimed for more complex situations when the structure is subjected to si
24. PE SOLID_Creep_Concrete only for Creep PROBLEMTYPE al ModelB3 CCModelB3 Bazant Baweja B3 model specified time and humidity history ModelBP1 CCModelBP1 full version of the creep model developed by Bazant Panulla ModelBP2 CCModelBP2 simplified version of the above model ModelACI78 CCModelACI78 creep model by ACI Committee in 1978 ATENA GiD 10 M4RC CCM4RC Extension of the CCM4R material model that also accounts for the effect of material creep and shrinkage SOLID Soil Rock Drucker Prager CC3DDruckerPragerPlasticity Plastic materials with Drucker Prager yield condition SHELL Concrete Steel Shell Concrete Steel CCShellMaterial Shell geometry with support Ahmad elements These elements are reduced from a quadratic 3D brick element with 20 nodes The element has 9 integration points in shell plane and layers in direction normal to its plane The total number of integration points is 9x number of layers Important feature of shell element is that its local Z axis must be perpendicular to the top surface of shell plane The top surface is the surface on which the positive Z axes points out of the shell Other two axes X and Y must be in the shell plane Such orientation must be ensured by user In each shell node there are 3 displacement degrees of freedom and corresponding nodal forces However some DOFs are not free due to introduction of kinematic constrains ensuring shell displacement model For more
25. al If 1t 1s necessary to create a new interval with the same conditions and properties as the current one the best approach 1s to open the Interval data dialog using the menu item E Data Interval Data or icon lt and then using the copy button Ol ATENA GiD 28 GiD AtenaV4 Static 2D and 3D Interface Files View Geometry Utilities Bele Mesh Calculate Interval Data i Basic Parameters Solution Parameters Eigenvalue Analysis Method Newton Raphson Displacement Error 0 01 Residual Error 0 01 Absolute Residual Error 0 01 Energy Error 0 001 Iteration Limit 30 DB DIG GME Pee gt Interval Data f v ES Basic Parameters Eigenvalue Analysis IV Interval ls Active Load Name Load Conditions Interval Multiplier 1 0 Materials k l Number of Load Steps 1 Kees z Store Data for this Interval Steps SAVE ALL Problem Data k Fatigue Interval MO Data units E Transport Import Interval k Interval Starting Time Interval End Time Local axes k EEE i Sten Vv IV Delete BC Data After Calculation F User Solution Parameters Close Interval Data f amp Basic Parameters Solution Parameters Eigenvalue Analysis Eigenvalue Parameters Number of Eigenvals 6 Max Eigenval Error 0 000001 Max Number of Subspace Iterations 14 JW Sturm Sequence Check Max Number of Jacobi Iterations 10 Number of Projection Vecs 15 Optimize Band Width Sloan
26. and any subsequent intervals Store data for this IntervalSteps SAME ALL la This option can be used to generate INTERVAL STARTING TIME 0 0 u several load steps with the same INTERVAL END TIME 1 sec conquers INCREMENT TRANSIENT TIME E SEC Indicates how often the results INTEGRATION TIME INCREMENT 0 1 SEC should be saved Than it is possible User Solution Parameters POPS on OF POSE ror E CALCULATE EIGENVALUES YECTORS Interval starting time interval end time Time increment which is to be specified for each generated step In case of multiple steps generation each step time increment will be assigned this value W Delete BC Data After Calculation Basic Parameters Dynamic Analysis DYNAMIC ANALYSIS METHOD HUGHES ALPHA METHOD H HUGHES ALPHA 0 05 NEWMARK BETA 0 2505 Th NEWMARK Gammajos nese Parameters are DAMPING MASS COEFFICIENT 1 789 explained in Fig 9 1 DAMPING STIFFNESS COEFFICIENT O Close Fig 9 3 Special dynamic Interval data properties ATENA GiD 48 10 POST PROCESSING IN ATENA GID The created model can be post process in the AtenaWin or in the GiD After finishing the nonlinear analysis AtenaWin window can be closed The program asks if all changes should be saved Then button Yes should be selected in all cases Then back in the GiD interface the process info will appear Through this dialog the program asks if the process of the analysed problem is finished or if the post proce
27. ant feature of shell element 1s that its local Z axis must be perpendicular to the top surface of shell plane The top surface 1s the surface on which the positive Z axes points out of the shell Other two axes X and Y must be in the shell plane Such orientation must be ensured by user In this local system are all reinforcement and all outputs form post processor In each shell node there are 3 displacement degrees of freedom and corresponding nodal forces However some DOFs are not free due to introduction of kinematic constrains ensuring shell displacement model For more details see Theory Manual Shell material can be used only on 3D quadratic brick elements 13 User s Manual With shell elements the best connection at edges is to cut both at 45 degrees or a different corresponding angle 1f the thicknesses are not the same or 1f connected at other than right angle see Fig 5 6 a Another option 1s to use a volume brick element at the corner which 1s the only feasible way when more than two shells are connected see Fig 5 6 b The Shell Solid Contact condition has to be assigned on the shell surface connected to the volume element for correct behavior Connecting like in Fig 5 7 1s not recommended as the master slave relations induced by the fixed thickness of the shell may cause numerical problems Shell 1 Brick Shell2 Shell3 a b Fig 5 6 Shell recommended connection a 2 shells b 3 shell
28. aterial offers default parameters They can be changed to any desired values After definition of material parameters the material can be assigned to the numerical model Operations for material assignment are done with the buttons in the bottom of the dialog Assign The target of assignment command depends on the display type In case that geometry is displayed then geometry type is to be selected line for reinforcement volume for concrete and material can be assigned to the geometric entities In case that the finite elements are displayed the material can be directly assigned to individual finite elements It should be noted that 1f a material is assigned directly to finite elements the assignment is lost every time the mesh is regenerated Draw displays the material assignment to volumes or elements Unassisgn Reverse operation It deletes the material assignment Import Export Read write material parameters from to a text file Table 1 Materials supported by GiD interface to ATENA ATENA name INP command Description SOLID Elastic Elastic 3D CC3DElastlsotropic Linear elastic isotropic materials for 3D SOLID Steel L Steel Von Mises 3D CC3DBiLinearSteelVonMises Plastic materials with Von Mises yield condition e g suitable for steel 9 User s Manual SOLID Concrete un Concrete EC2 CC3DNonLinCementitious2 Material is like Cementitious2 You can generate material properties accord
29. ation about geometry of the model The exported data are compatible with import data format of creep and shrinkage analysis or by element temperature load for static analysis without creep Hence 1t is very easy to transfer the histories between this analysis and any other analysis that can make use of 1t This means that 1t is not necessary to use the same model or finite element mesh in the A5 User s Manual transport and stress analyses During the import the program ATENA automatically determines the closes nodes and makes the necessary interpolation CM je The dialog in Fig 8 3 available by pressing kid is used to define one or multiple execution type steps Meaning of the parameters is self explanatory but it should be noted that unlike in creep and shrinkage analysis described in the previous section of this document heat and transport analysis does not generate any internal sub steps All the steps have to be defined manually using the dialog below Can be used to scale all the condition values forces A description of load condition interval This helps to identify this interval in the ATENA input file displacements Interval Data i x Indicates how often the results i ES O 7 should be saved Than it is possible to use them for post processing LOAD MAME Load TEMP LOAD STEP Multiplier 1 0 Shore data for this Intervalsteps SAME ALL MW Generate Multiple Steps Number of LOAD STEPs 1 INCREMENT TRANSI
30. can be done in two ways In the first and most convenient way the material is assigned to a geometrical entity This is usually a volume in 3D or a surface in 2D On the other hand reinforcement properties are usually assigned to line entities After the element generation the material is automatically assigned to finite elements that are generated on the corresponding geometric entity The second possibility is to assign materials directly to the finite elements The material assignment and definition is activated either AQI from the menu item Data Materials or by the icons a i 5 Data Mesh Calculate ATEMA Help Problem type a P 5 Conditions Materials SOLID Elastic Interval Data SOLID Steel i SOLID Concrete a a SOLID Soll Rock eau SHELL Concrete Steel Interval BEAM Concrete l 10 Reinforcement Local axes k Interface Spring Fig 5 4 Example of available material categories for static analysis ATENA GiD 8 SOLID Concrete Lementitiousz i Basic Tensile Compressive Miscellaneous Element Geometry Maternal Prototype CC3DNonLinCementitiousz Young z Modulus E 34000 MPa Poisson z Ratio ML 0 2 Tension strength FT 2 18 MPa Compresion strength FC l 34 0 MPa Assign Unazzign Exchange Fig 5 5 Example of menu window for the material concrete Each material can be defined in a special dialog window Example of such a window for concrete material is shown in Fig 5 5 Each m
31. dels a creep prediction model a short term model concrete and short term model for smeared reinforcement This type of input data in GID is still in stage of development and thus not all combinations of the material candidates suitable for one of the three material types are supported The corresponding input data dialog is invoked by pressing the icon and it pulls out the following dialog sheets ATENA GiD 42 x CCCombinedMaterial Y BOX h 7 Basic Creep Comp Concrete Comp O Element Geometry Solid Material Prototype COModelBI mproved Concrete Typel CI Normal THICKNESS 0 0767 HUMIDITY 0 780 DENSITY 21 25 AC 7 04 wC 0 63 SHAPE FACTOR square prism CURING AIR END OF CURING TIME 6 3 day Activate Compliances Activate Losses Activate Shrinkages Activate History Assign Draw Unassign Exchange Close Fig 7 4 Reinforced concrete material with smeared reinforcement The dialog has several pages each corresponding to a particular type of data For example the sheet Creep Comp serves for input data for creep prediction model and ol it resembles the dialog called by pressing The sheet Concrete Comp includes input data for short term model for concrete similar to that invoked by en etc The individual smeared reinforcement components will appear under the label Concrete Comp 0 3 Although there may be a few more differences between analyses with and wit
32. e bigger surface belongs to The easiest way usually is to copy the smaller surface Then create a contact volume from the two smaller surfaces and assign the desired interface GAP material to 1t Finally connect the additional surface to the bigger surface using Master Slave conditions Boundary conditions surfaces fixed contact for surface see the Conditions section 5 2 for explanation of fixed contacts The normals of all surfaces have to point out of the volumes connected by the interface The normal directions have to be fixed before creating the contact volume Refer to the Interface Material Model section of the ATENA Theory Manual for the explanation of the interface material parameters 5 3 4 1 Example Creating a Contact Surface The purpose of this example is to show how to create an interface between the two concrete blocks modelled in two dimensions The two blocks are shown in Fig 5 25 The interface will be added at the place of the inclined line Fig 5 25 Creating a contact surface Introduction The interface can be created through the following steps illustrated in Fig 5 26 Fig 5 27 and Fig 5 28 Step 1 Create the 2 surfaces to be connected by a contact Step 2 Move one surface away by a small distance using Utilities Move Notice that two points 9 10 and one line 10 1s created ATENA GiD 26 A A a z R R K ak mi Wa Da dy tl iia is l
33. efine Local Ass Automat eline Local Axis j Prescribe normal of shell elements If necessary element incidences are reordered such that the internal shell element is perpendicular to the prescribe vector If DETECT VECTOR is not specified the depth is chosen to comply with the smallest dimension of the element Otherwise it is chosen to have the smallest angle with the given vector 4x1 x2 x3 Assign Unaesign Exchange Fig 5 9 Shell material properties Local Coordinate System SHELL Concrete Steel Shell Concrete Steel OE Basic Local Coordinate System Base Reinforcement 01 Reinforcement 02 E Number of layers in shell Lrossection Layers Layer Count macroelement Layers 4 Reference thickness used to S Activate Ref Thick transform normalized layer l l coordinates to real coordinates Solid Ref Thick 0 3 il By default this value is not Use Base Material Cementitious SEO specified and in this case actual shell thicknesses at integration points are used instead This input is particularly useful if a reinforcement layer is placed at constant distance from the shell bottom or top surface whereby Microplane me the shell real thickness is SBE TA Material variable Elastic 3D Parameters of solid material Steel YonMises 30 gt Fig 5 10 Shell material properties Base Read me Fight_click_for_helpl Cementitious Cementitious User Cementitious SHEE Cementitious Reintorced Concrete
34. emID AddingShellID 2 1D Element mem AddingBar WithBond Increment if is element BarWithBond Formula ELEMENT TYPE ID ElemsNnode AddingBarWithBond AddingNonLinElemID 3 Load cases In Dynamic problem there is a special load case for total conditions in each interval numbered 510 000 step number Similarly in Transport problem load cases for Fire Boundary Conditions have numbers 520 000 step number 59 User s Manual REFERENCES 1 2 3 4 5 Cervenka V Jendele L Cervenka J 2007 Atena Program Documentation Part 1 Theory Cervenka Consulting 2007 Cervenka V and Cervenka J 2007 Atena Program Documentation Part 2 1 User s Manual for Atena 2D Cervenka Consulting 2007 Cervenka V and Cervenka J 2007 Atena Program Documentation Part 2 2 User s Manual for Atena 3D Cervenka Consulting 2007 Cervenka J and Jendele L 2007 Atena Program Documentation Part 6 Atena Input File Format Cervenka Consulting 2007 Jendele L 2007 Atena Program Documentation Part 7 AtenaWin Description Cervenka Consulting 2007 ATENA GiD 60
35. escribes the method that is used by GiD ATENA interface to determine the numbering for ATENA element types and element groups The numbers of element types and element groups will not be identical to the ids in GID It is impossible to preserve the same ids in GID and ATENA The ATENA ids are derived based on the number of element nodes and based on the used material using the tables and formulas below Table 4 ATENA element type ids based on the geometric nonlinearity and number of element nodes The element type id are calculated based on Eq 2 and 3 aan cometa ElementType for 3D ElemsNnode LINEAR NONLINEAR CClsoGap lt xxxxxxx gt AA CCIsoGapxxxxxx gt 6 ee CCIsoBriekaxxixx xxx xxx CCsoWedgecxxw S Sa CC Iso Tetra saree o oe v CCIsoBrick lt xxxxxxxx gt CCIsoWedge lt xxxxxx gt CCBarWithBond CCIsoTetra lt xxxx gt CCIsoTruss lt xxx gt CCIsoTruss lt xx gt ElementType for 2D TI LINEAR NONLINEAR CCIsoGap lt xxxx gt CCIsoQuad lt xxxxxxxx gt CCIsoTriangle lt xxxxxx gt CCBarWithBond CCIsoQuad lt xxxx gt CCIsoTriangle lt xxx gt CCIsoTruss lt xx gt iia 4 1 fa ATENA GiD 58 ELEMENT GROUP ID Mat ID 100 ELEMENT TYPE ID 1 3D Element AAA AddingShellID Increment if is Shell element AddingGapElemID Increment if is Gap element AddingNonLinElemID Increment if is element Geometrical Nelinearity Formula ELEMENT TYPE ID ElemsNnode AddingGapElemID AddingNonLinEl
36. f 01 Poison z Katio MU 0 3 Reimt Ol Yield Strength T 5 550 Kent 01 Number of Multilinear values 2 Reinf D1 eps2 0 025 Reinf 01 f2 578 Reinf D1 eps3 0 ReinFOTFBJO 280 Reinf D1 epsa 0 0000 Reinf D1 flo Reinf D1 eps5 0 0000 Reinf 01 ja Rent RHO Density 0 00785 Reint Thermal E pansion Alpha 0 00001 E Assign Unassigri Exchange Fig 5 17 Beam material properties Reinforcement 21 User s Manual BEAM Concrete peamconcetesieel MEN Basic Local Coordinate System Base Element Geometry Geometrical Mon Linearnty LINEAR Initial Strain Application DEFAULT PROCESSING Initial Stress Application DEFAULT PROCESSING Element Type Idealisation Beam 0 Unassigri Exchange Fig 5 18 Beam material properties Element Geometry 5 3 3 Reinforced concrete SOLID Concrete RenfocedConcrte OX Basic Concrete Tensile Compressive Miscellaneous smeared Renf 01 Element Geometry Material Prototype CCCombinedh aterial 7 i Activate Smeared Fieint ijine The smeared reinforcement T Activate Smeared Reint 02 components are activated using these checkboxes Activate Smeared Reint 03 Unassigri Exchange Fig 5 19 Reinforced Concrete material properties Basic ATENA GiD 22 SOLID Concrete Pr OR Basic Concrete Comp D l CCSD N onLinCementitious Miscellaneous CCSmearedReinf 01 Element Geometry Base Material Prototype LLIDMOnLInCementtouzz 1L You
37. f these reinforcement lines such that a single finite element 1s generated by GiD This finite element is then used in ATENA to generate the embedded discrete bars depending on its intersections with the solid model Of coarse circular or curved bars should be meshed with more elements in order to capture the curved geometry for example at least 8 divisions for a circle 5 7 1 Notes on meshing The finite element mesh quality has a very important influence on the quality of the analysis results the speed and memory requirements Refining only the important parts can save a lot of processor time and disk space A bad mesh like a single layer of volume elements in a region where bending plays a significant role can produce very wrong results see the Mesh Study example in the ATENA Engineering Example Manual A minimum of 4 6 elements per thickness is recommended for at least qualitative results in bending Alternatively shell elements may be used see section 5 3 1 33 User s Manual 5 8 Finite Elements for ATENA In each volume we must choose a type of finite element Following types can be used in ATENA in parenthesis we give also the number of nodes and a code name used in ATENA Table 3 Element library compatibility Linear and quadratic line element 2 nodes CCIsoTruss lt xx gt 3 nodes CCIsoTruss lt xxx gt Linear and quadratic triangular element 3 nodes CCIsoTriangle lt xxx gt 6 nodes CCIsoTriangle lt xx
38. g scale It affects the number of SET SAMPLE TIMES PER DECADE 6 generated sub steps and depends on SET STOP TIME ISS day the time units recommended value M MOISTURE HISTORY IMPORT 2 6 if time units are days AT ORY OVERWBITE IMPOR To be selected if moisture data are to be imported to Stop time defines the end of the the stress analysis analysis The analysis is stopped when this time is reached should be smaller than RETARDATION TIMES TO This is to be selected in case if moisture and or temperature data are to be imported to the stress analysis Fig 7 1 Problem data dialog 7 1 Boundary conditions and load cases related input The essential part of any FEM analysis is to set correct boundary conditions for the analysed problem The related input information is specified in creep and shrinkage analysis in the same way as it is in a static analysis without creep see the dialog called by pressing the icon A from the GiD toolbar However one must be aware of the fact that the execution step for which the user defines boundary conditions is ATENA GiD 40 automatically by ATENA kernel subdivided into several sub steps That s why creep and shrinkage analysis must distinguish between boundary conditions that are to be applied to all internal sub steps and boundary conditions applicable only for the first sub step Typically support conditions should be applied in all sub steps but the loading increment should be applied onl
39. gnificant moisture and humidity variation in time and space In this case mechanical creep and shrinkage analysis is preceded by a transport analysis whose aim is to compute moisture and temperature histories of the structure in each of its material 1 e integration point The corresponding data type for the transport analysis is Transport At the end of the transport analysis the calculated histories are exported into disc data files from where they are later imported into the mechanical analysis The transport analysis is described in the next section of this document Generally speaking the procedure of preparing input data for creep and shrinkage analysis and its execution within Atena GiD environment is very similar to that for usual static analysis neglecting the effect of time This process is described in the previous section of this document Hence in this section we will concentrate on description of the additional input commands that are specific for creep and shrinkage and we will not repeat what 1s already written in the previous sections of this document for static analysis without creep Clearly the main difference between usual static and creep analysis is that the latter one carries out analysis integration of structural response in time Hence all definitions of the analysis s steps boundary conditions loads etc need additional information about time conditions Time factor appears also in the constitutive equations
40. hout creep and shrinkage it 1s believed that most important ones have already been covered in this section The rest should be self explanatory and possible to being used without any further explanation 43 User s Manual 8 ANALYSIS OF MOISTURE AND HEAT TRANSPORT Although heat and moisture analysis can be executed as a standalone analysis in the Atena GiD framework it is usually the first part of a static or creep and shrinkage analysis Its goal is to calculate moisture and temperature conditions in the structure As a result we get histories of temperature and moisture variation at each material point of the structure and these data are later used by a stress analysis or creep material model to better predict stress strain relationships with the effects of temperature creep and shrinkage Main use of moisture and heat transport analysis is to calculate temperature increments inside a structure These increments are later used in calculation of elements thermal expansion and associated initial strains load in conventional static analysis In the stress analysis by ATENA it is also possible to consider the temperature dependence of material properties Moisture and heat transport analysis is activated in GiD by selecting an appropriate problem type Temperature see the menu items Data Problem Type AtenaV4 Currently only one material model is supported The corresponding input data dialog vv lada appears by pressing
41. id Example with 3D beam elements DirectTensionFatigue gid Example of a notched direct tension test with fatigue material model Directory Tutorial Temperature2D PipeBStatic gid Static part of a pipe analysis with thermal loading PipeBTemp gid Thermal part of a pipe analysis with thermal loading Directory Tutorial Temperature3D tram0 14statb DM gid Static part of a 3D beam analysis with thermal loading tram014temp5 DM gid Thermal part of a 3D beam analysis with thermal loading ColumnThermal3D gid 3D Column with temperature loading ColumnThermal3D demo gid Same as above but for demo version tubbing static2 1932 gid 3D tubbing with fire loading static tubbing temp2 1932 gid 3D tubbing with fire loading transport Vitek3Dfire gid 3D four point beam with fire loading Vitek3Dmoist gid 3D four point beam with moisture loading Vitek3 Dstat gid 3D four point beam with temperature loading static Vitek3 Dtemp gid 3D four point beam with temperature loading transport Directory Tutorial Dynamic BridgeConcreteSinusImpulsLoad gid Simply supported beam with sinus impuls load BridgeConcreteSinusImpulsLoad demo gid Same as above but for demo version BridgeElasticSinusImpulsLoad gid Simply supported beam with elastic material and sinus impuls load SingleDegreeFreeVibration gid Single degree of freedom example with free vibration 57 User s Manual 13 CALCULATION OF ATENA IDENTIFICATION NUMBERS The following section d
42. inCementitious2 The short term model is also called the base material model The input data in GID reflect this structure The user has to specify two sets of parameters one for the creep prediction model one for the base material model and each such a set is assigned a dedicated date sheet The actual data input dialog is 41 User s Manual invoked by pressing the icon or via menu Data Materials Creep and it is shown in Fig 7 3 SOLID Creep Concrete E Model B3 BOX MW Creep Material B3 Laboratory Base Material Element Geometry Maternal Prototype LLMadelb3 Concrete Tppel lij Normal H Thickness 0 0767 Humidity 0 780 Density 2125 AL 7 04 WE OBS Shape Factor square priem Cunng AR 01 End of Curing Time 6 9 day Assign Unassign Eschange Fig 7 3 Material input dialog The combo box at the top of the dialog specifies a type of material model to be used and it follows a number of related input parameters It is beyond the scope of this document to provide their description For more information please read the Atena theory 1 and input data documentation 4 and or literature that is referred to The above applies for concrete structures or for concrete structures with discrete reinforcement only The situation is a bit more complicated in the case of concrete structures with smeared reinforcement when a material definition for creep and shrinkage analysis should comprise three material mo
43. ing the EC2 Cementitious2 CC3DNonLinCementitious2 Materials suitable for rock or concrete like materials This material is identical to 3DNONLINCEMENTITIOUS except that this model is fully incremental Cementitious2 User CC3DNonLinCementitious2User Materials suitable for rock or concrete like materials This material is identical to 3DNONLINCEMENTITIOUS2 except that selected material laws can be defined by user curves Cementitious2 SHCC CC3DNonLinCementitious2SHCC Strain Hardening Cementitious Composite material Material suitable for fibre reinforced concrete such as SHCC and HPFRCC materials Cementitious3 CC3DNonLinCementitious3 Materials suitable for rock or concrete like materials This material is an advanced version of 3DNONLINCEMENTITIOUS2 material that can handle the increased deformation capacity of concrete under triaxial compression Suitable for problems including confinement effects Reinforced Concrete CCCombinedMaterial This material can be used to create a composite material consisting of various components such as for instance concrete with smeared reinforcement in various directions Unlimited number of components can be specified Output data for each component are then indicated by the label i Where i indicates a value of the i th component Microplane M4 CCMicroplane4 Bazant Microplane material models for concrete Bazant_Xi_ 1994 CCModelBaxi94 Material for transport analysis fTransport3D PROBLEMTY
44. is done by selecting for example the menu item Data Problem type AtenaV4 Static as shown in Fig 5 1 By this command GID is configured to create data for analyses which are compatible with ATENA input format units materials conditions etc The data resulting from the GiD modelling will be later transferred to ATENA by via an input file usually called name inp Project UNNAMED ET HY ER a Ease ee Problem tupe k Fa ef Creep M Transform F e Internet Retrieve fel nh Dynamic Ai E C Static E Debugger Fi E HI1 H 6 Interval l A pr Local axes l Fig 5 1 Problem tvpe menu The problem tvpe definition must be done before starting input of anv data Executing this command later mav cause losing of some existing data 5 2 Conditions The supports and loading conditions for ATENA can be defined in a way which is compatible with ATENA through the menu Data Conditions Fig 5 2 left It should be noted that the loading and boundarv condition definition 1s closelv related to the definition of Interval data see Chapter 0 The specified boundarv conditions are alwavs defined in the current interval Information about global and local coordinate svstems for each element load vou find in Theorv manual in chapter 3 14 The conditions can be assigned to four kinds of geometrical objects nodal points finite element nodes lines surfaces and volumes The object dimension
45. l in cases when very complex meshes for curved geometries need to be created 55 User s Manual 12 EXAMPLE DATA FILES Following data files of examples for GiD application are included in the ATENA installation Directory Tutorial Creep2D BeamWithCreep gid Slab with creep that is modelled as a two dimensional structure Directory Tutorial Creep3D Slab WithColumn gid symmetric quarter of a square 3D slab with creep modelled using shell elements ReinforcedSlabWithSpringSupport gid creep experiment in Bratislava Directory Tutorial Static2D axisym gid Axisymmetric problem PunchingShearFailure gid Axisymmetric problem of slab punching failure InterfaceWithShear gid Example with an interface material model Tunnel WithConstructionProcess gid Two dimensional analysis of a simple tunnel with construction process FourPointRCBeam gid Only static analysis without creep of the slab specimens tested by Metrostav Praha FourPointRCBeam demo gid Same as above but can be analysed with ATENA demo Directory Tutorial Static3D SmallCantileverWithTorsion DiscreteBars gid Example of L shaped cantilever with discrete bars for main reinforcement as well as for stirrups InterfaceWithShear3D gid Example of interface between two concrete plates ATENA GiD 56 Slab WithColumn gid Slab column connection Tunnel3 DWithConstructionProcess gid Three dimensional model of a tunnel with soil and construction process BeamWithBeamElements g
46. lement modeling a spring The following table summarizes which material types are available in the various G1D ATENA problem types G1D versions older than 7 4 may have compatibility problems with the newer problem types Similarly older versions of ATENA prior to the version 3 x x may have problems with the newer problem types Table 2 Available ATENA material types in various GiD ATENA problem types Materials for problem type Transport ATENA GiD 12 CCPlaneStressElastisotropie x CCPlaneStrainElastIsotropic o CCPlaneStressSteel x CESBETAMaterat CCIDElastisotropie x x CCReinforcement x x CCReinforcementWithTempDepProperties x CCSmearedReinf CCCyclingReinforcement ee L I CC3DDruckerPragerPlasticty x x cCSpringMaterial SiC x CCShelIMaterial Ex x Px x CCBeam3 DMaterial CCModelB3 ara CCModelB3Improved Ix Fa re E ccModeicsn73i201 S fx ccmoaieeri Y x ccmodaiee2 Ix ccmogelacrrs S x CCModelbaxioa x Materials with difficulty parameters used in more problem types are described below 5 3 1 Shell Material In this section 1s described shell material Shell material has geometry with support Ahmad elements These elements are reduced from a quadratic 3D brick element with 20 nodes The element has 9 integration points in shell plane and layers in direction normal to its plane The total number of integration points is 9x number of layers Import
47. lt Surface gt Sil FRACTURE STRAIN Deformation e Sill FRACTURE STRAI Line Diagram cz lek a NEE VR D gt DD Siii F RACTURE STRA 1 6129e 06 0 00029593 0 00059348 0 00089103 9 0011886 0014861 gee S ais nea ie LO ey e p 0017837 The message window shows maximum 020812 s s 1 0023788 z and minimum fracture strain 1 0026763 k Contour Fill COD1 Min 0 Max 0 0005707 Contour Fill Sii FRACTURE_STRAIN Min 0 0026763 May 1 6129e 006 Contour Fill of FRACTURE STRAIN Siii F RACTURE STRAIN E The 35 step is post processed Command ig 10 10 The displayed FRACTURE STRAIN More post processing capabilities can be found in the Help of the GiD ATENA GiD 54 11 USEFUL TIPS AND TRICKS 11 1 Export IXT for Atena3D pre processor It is also possible to export 3D mesh to an IXT format which can be imported to Atena3D Pre processor This tool can be run from menu ATENA Export IXT file for Atena 3D In this way it is possible to export meshes created by GiD into ATENA 3D There it is possible to include ATENA specific features such as reinforcement materials and boundary conditions In this approach only 3D solid finite elements will be transferred to ATENA All boundary conditions two dimensional and one dimensional elements will be lost as well as all material definitions This method is usefu
48. ng Modulus E 34000 MFa Poisson Ratio MU 0 2 Tension Strength FT 2 18 MPa Compresion Strength FC l 34 0 MPa M M Fracture Energy GF 7 01 8e 5 T Critical Comp Disp D 0 0005 m Assign Unassign Exchange Fig 5 20 Reinforced Concrete material properties Concrete compressive 23 User s Manual SOLID Concrete Basic Concrete Comp 0 LL IDNonLInLEmenititivusz Miscellaneous CEsmearedReinf 01 Element Geometry Fixed Crack 1 al Activate Crack Spacing Activate Tension Stiffening Plastic Strain EPS CP 0 0009968 Onset of Crushing FCO MPa Excentrcit Ex E 10 52 m sare e Assign Draw Unassign Exchange Close Fig 5 21 Reinforced Concrete material properties CC3DnonLinCementitious2 SOLID Concrete Penos sw MN NM Basic Concrete Comp U CC3DMonLinCementitious2 Miscellaneous CCSmearedR eint 01 Element Geometry kton AHO Density 0 0025 m Thermal Expansion 4lpha 0 00001 E Assign Draw Unagsign Eschange Close Fig 5 22 Reinforced Concrete material properties Miscellaneous ATENA GiD 24 4 SOLID Concrete Posea sw EN Basic Concrete Comp U CC3DN onLinCementitious2 Miscellaneous LLomearedheimt DI Element Geometry Reint OI Material Prototype CCS mearedAeinf Reinf I Young z Modulus E 2 0E 5 MPa Rent 01 Reinforcing RATIO p s Ac 0 01 Reinf 01 Dire of the smeared reint fi Reinf 01 Dir of the smeared reint fr Reinf 01 Dir Z
49. numbering than GID this means that during the export of the ATENA input file the nodal numbering is modified to correspond with the ATENA format as 1t 1s described in the figure below CCIsoBrickexxxx Linear and quadratic Wedge structured mesh 6 nodes CCIso Wedge lt xxxxxx gt 15 nodes CCIlsoWedge lt xxxxxxXXXXXXXXXX gt However ATENA is using a different nodal numbering this means that during the export of the ATENA input file the nodal numbering is modified to correspond with the ATENA format as it is described in the figure below 35 User s Manual CCIsoWedge lt xxxxxx gt In ATENA GID interface it is possible to model springs in two ways Either by generating elements along a line or surface and then by assigning them a Spring material property Alternative approach is by prescribing springs as conditions using the Data Conditions menu With the second approach it is easier to define springs that are normal to a curved surface or line CCSpring 2D and 3D element to model spring like boundary conditions at a point CCLineSpring 2D element to model spring like boundary conditions along a line CCSpring CCLineSpring CCPlaneSpring 3D element to model spring like boundary conditions along a triangular area ATENA GiD 36 Interface CCPlaneSpring CCSpring 2D quadratic 6 node line interface CCIsoGap lt xxxxxx gt 3D triangular 6 node interface CCIsoGap lt xxxxxx gt
50. odel as discrete reinforcement bars This means that they will be further subdivided depending on their intersections with the solid finite elements By default the GiD program automatically detects lines which are not connected to any volume or surface 7 User s Manual and treats these lines as reinforcement This default behaviour can be controlled by the corresponding check box in Problem data dialog If this check box is deactivated it is necessary to manually assign these conditions to any line that should be modelled by embedded reinforcement elements The lines which are not identified as reinforcement are treated as standard truss elements In this case the user 1s responsible to ensure that the mesh along each line is compatible with the rest of the model Problem Data K 2 Global Settings Global Options Time and Transport Create Global Monitors MASTER SLAWE DISTANCE J 1 0E 4 SOLVE LHS BCS OFF Extrapolation Nearest IF iM Show Surface Loads In Post Processor Write Output Data if Automatic Reinforcement Identification Close Fig 5 3 Automatic reinforcement identification in the Problem Data dialog BC Springs Springs created using boundary conditions Spring for Point Spring for Line Spring for Surface cannot be modified If it is neccessarry to modify their properties a redefinition 1s necessary 5 3 Materials The materials are first defined and then assigned to the model The later
51. of the smeared reint fr Reinf 01 Yield Strength Y S 550 MPa Reinf 01 Number of Multilinear values 2 Reint 01 eps2 0 025 Reinf 01 f2 578 MPa Reint 01 eps3 0 ReinfOrraja MPa Reinf 01 eps4 o Reinf 01 f4 O MFa Reinf 01 eps5 0 8 89 ReinfO1iajo MPa kton Reinf 01 RHO Density 0 00785 a m Remf 01 Thermal E panzion Alpha a ODO Assign Unassign Exchange Fig 5 23 Reinforced Concrete material properties CCSmearedReinforcement SOLID Concrete rod Cove we EN Basic Concrete Comp U LLD MonLinLementitionizz Miscellaneous CCSmearedReinf 01 Element Geometry Geometical Non Lineanty LINEAR IDEALISATION JD Assign Unassign Exchange Fig 5 24 Reinforced Concrete material properties Element Geometry 5 3 4 Interface Material The interface material also called GAP has been developed to model behaviour of contacts between volumes e g concrete steel or thin layers of e g mortar This 25 User s Manual material should only be assigned to contact volumes or contact surfaces in 2D An example how to create a contact surface 1s shown in section 5 3 4 1 GID only allows prism contact elements between surfaces of the same size and mesh settings Therefore if the two surfaces to be connected are of different sizes partial contact or with differing meshes an extra surface needs to be defined of the size of the smaller of the two located a small distance e g 0 1mm inside the volume th
52. or PC protection After making the appropriate selection and clicking the button Select the following dialog appears depending on the previous choices 3 User s Manual Enter password window E Enter password window Contact your Software dealer ta Contact your Software dealer ta obtain the key for this host obtain the key for this host Mame Forza Mame usb be Operating System windows Operating System windows apaina 474e574c041 4b3b7 apanta 561 2b40b0209080 or get it from or get it from http Ana gidhome com password http rwm gidhome com password Enter the password D Enter the pass s Ok Evaluation Cancel Ok Evaluation Cancel Fig 3 2 GiD register window PC protection left USB protection right If GiD have been registered previously a same official version of GiD the password can be reloaded by clicking and selecting the folder where the old password is The new password is obtained by clicking the web address or pasting it into the web browser In this website the user then should follow the instructions to obtain the password which should be typed or copied into the bottom line in the above dialog In order to obtain the final password the user will need to provide some information such as for instance email address The most important information 1s however the Name operating system and sysinfo as shown in Fig 3 2 Please also note that the Name refers to the label of your USB
53. rectly from the GID web page http www gidhome com With valid license number it is necessary to obtain a password for the computer on which the GiD will be operated This process 1s activated by starting G1D and proceeding to the menu Help Register It should be noted that there are two possibilities how to operate the GiD program Normally the GID password is specific to a certain PC configuration In this case the full version of GiD can be operated only on this computer Alternatively it is possible to license GID to a portable USB memory flash disk Then it 1s possible to operate GiD on every computer to which the registered flash disk 1s attached The license price for USB protection is slightly different then the one for PC protection so it is important to choose this option during the program purchase If the USB protection is wanted it is necessary to attach the USB flash disk to the computer Then the item Help Register should be selected If the supported flash disk 1s attached to the computer the following dialog appears in which the proper choice of the protection mechanism is to be selected Please make sure that the correct choice 1s made here It 1s difficult to change the protection method in the future Sysinfo selection Select one of the following sysinfos to register GID Type Sjysinfo Local machine 504a5a390332ca11 Kingston DataTraveler 0 Re usb be nb 264060209080 Select Cancel Fig 3 1 Choice of USB
54. rgence Line Search With keratians Line Search WithNteratians Unbalanced Energy Limit 10 8 Line Search lteratior Limit E Minimum Eta 10 1 Masimum Eta li Advanced Setting Method If elastic stiffness is used this should be selected to each step Method for solving the system of eguations for large 3D problems ICCG or DCG methods should be chosen Line search method helps to stabilize the convergence See the theory manual 1 Fig 5 31 Problem data Solution parameters Accept Close ATENA allows automatic generation of master slave contacts on surfaces or lines This parameter is used as a tolerance value in this algorithm Activates a window for the definition of X additional monitors The manual 4 should be consulted for details Problem Data Global Settings Glok Create Global Monitors Turns on and off an advanced LHS BCs management By MASTER SLAVE DISTANCE l 5 0E 4 LA default it is ON Do not change this parameter unless unavoidable and all consequences are being well understood SOLVE LHS BCS OFF Extrapolation Nearest IF eee m During post processing nodal data will be calculated by the projection i Show Surface Loads In Post Procezzor from the closest integration point je write Output Data l When active the element surface loads are shown in the post processor When deactivated less memorv is used 1D entities not connected to any surface or volume will be
55. rocess information Results file C ADocuments and Settings ZdentPlocha Tutorial E sample 3DBeam 12 8 2009 structured mesh gid 3DBeam 12 8 2009 structured mesh post res not found ES Es IM lt Px Ale E Version 9 KAE S M BON a LA 2 Pr d lt IA RD amp R je o NM FADO NSN ZA z K 2 volume meshes and 1 surface mesh read from AtenaResults flawia msh 200 Results read new format Command Fig 10 4 The importing of the results from AtenaWin were finished ATENA GiD 50 After importing data from AtenaWin the post processing can be started Let s display for example cracks width First of all it should be checked which step will be post processed It is done by selecting View Results Default Analysis Step AtenaResults2GiD in the main menu or by the Default Analysis Step icon BE for example step 35 see Fig 10 5 GiD AtenaV4 Static 2D and 3D Interface Project AtenaResults Files View Utilities Do cuts ARETES Options Window Help ES KA eS NoResults ww Version 9 No Graphs gt Contour Fill Smooth Contour Fill Contour Lines Contour Ranges Show Min Max Display Wectors Iso Surfaces Stream Lines Graphs Result Surface Deformation Line Diagram OD y MA wh al TE F F gt U PE E E Y N E m E E A X gt K 200 Results read new format Selected new analysis and step Command Fig
56. rties Basic BEAM Concrete Beam Concretar KEN OM Basic Local Coordinate System Base Element Geometry W Define Local Anes 4 2 Vx D Wy 1 Wiz 0 3110 3110 W321 Assign Draw Unazsign Exchange Close Fig 5 15 Beam material properties Local Coordinate System 19 User s Manual BEAM Concrete Beam Concrete 5teel Basic l Local Coordinate System Base Element Geometry l Number of Ps inFR 4 Crossection Cells Cell Count Babe KE o Number of cell in axes t and s Cell Number in s 4 TH Numbers of Inactive cells Inactive Cells NUMBERS ik IV Activate Ref Height a vas A Beam Ref Size lO 3 m T i k Ia Material parameters W Activate Ref width Beam Ref Size 20 2 m Use Base Material Cementitious oh dilek Ge beet bnerete ELZ Read me Right click for helpl ana Indvidual cells Cementitious Cementitious User Cementitious SHLL Cementitious Reinforced Concrete SBETA Material Elastic 30 Steel YonMises 3D Fig 5 16 Beam material properties Base ATENA GiD 20 BEAM Concrete Beam Concrete ws P XK Basic Local Coordinate System Solid Reinforcement Element Geometry Heinl Maternal Prototype CCoDBiLinearsteelttontiizez Reint Profiles ST Area 5 Coord T Coord Activity if Help Calculator To recalculate click 2x Update Description of reinforcement in beam changes next ta material box o t t Kem Ol rouna z Modulus E 20E 5 Rem
57. s Fig 5 7 Shell not recommended connection The ATENA implementation of the Ahmad shell element supports embedding of smeared reinforcement lavers In this concept reinforcement bars with the same coordinate z material and the same directions are replaced by a layer of smeared reinforcement Such a layer is placed at the same elevation z as the original reinforcement bars and its thickness 1s calculated so that sum of cross sectional area of the bars and the replacing smeared reinforcement layer 1s the same The layer 1s usually ATENA GiD 14 superimposed over existing concrete layers and it employs CCSmeardReinforcement material law which makes possible to account for the original reinforcement bars direction SHELL Concrete Steel Shell Concrete Steel BOS oT Basic Local Coordinate System Base Reinforcement 01 Remforcement U Element Geometry Material Prototype CES held aterial i Activate Reinforcement 01 On this list JOU cana ad reinforcement for each from 4 layers The new lists will be added to top row of list name if Activate Reinforcement 02 Activate Reinforcement 03 Activate Reinforcement 04 Assign Unassign Exchange Fig 5 8 Shell material properties Basic 15 User s Manual SHELL Concrete Steel hel Conceteste IO Basic Local Coordinate System Base Remforcement UI Reimforcement U Element Geometry W Define Local Axis Z Woe D Woy D fazi D
58. s is independent of units and can be performed in any units The units of results are the same as those of input In case of other units it should be realized that the numerical values of material parameters may change Consequently ATENA GiD 32 the default material parameters in SI units offered in GiD cannot be used and must be modified as 1t 1s necessary for the selected set of units Problem units Model rt M Units System Base System ATENA SIMM AND M ATENA Sl MM AND M LENGTH MATENA SI KN AND M TIME dATENA SIN AND M ATENA AMERICAN MASS kit Accept Cancel Fig 5 36 Definition of units and possible set of alternative units 5 7 Finite Element Mesh The generation of a finite element mesh in GID is done from the menu Meshing Please refer to GID documentation for details Here we shall mention only meshing of reinforcing bars which is specific for ATENA The geometrical model of a bar discrete reinforcement is modelled by one dimensional entities 1 e lines Since GiD does not have a capability to generate embedded bar elements this operation 1s performed later at the beginning of the ATENA analysis For this we need to export the geometrical forms of the bars Since GiD can export only finite elements it is always necessary to first generate some 1D truss elements along each line which represents the reinforcement see also page 7 It is therefore recommended to select the meshing properties o
59. ssigned conditions Draw Display of assigned conditions There are various visualization modes possible in this command Unassign Reverse operation It cancels the current assignment of the selected condition type There are certain conditions in the dialog in Fig 5 2 which are strongly ATENA specific Monitors It is for instance the condition Monitor This is neither a boundary condition nor a loading but it makes it possible to record certain quantities during the analysis such as load displacement diagrams It is therefore reasonable to include their definition only in the first Interval data see Chapter 0 The monitors defined in intervals other than the first one are ignored Fixed contact This condition also does not impose any actions on the structure but it can be used to connect together two parts of the model which are separated by duplicated entities You can have multiple Master Slave connections identified by different names Only Master and Slave conditions of the same name are connected together The meshes on the contact entities do not need to be compatible ATENA creates special master slave conditions that enforce the compatibility of displacements Reinforcement identification This condition is used to identify that certain line entities should be treated as ATENA discrete reinforcement bars The truss elements which will be generated along these entities will be embedded into the ATENA m
60. ssing should be started The button Postprocess should be selected see Fig 10 1 Process info Process SDEeam 3l f 2009 started at Fri Jul 1 15 10 21 has finished Postprocess Fig 10 1 The button Postprocess should be pressed But before any post processing features can be used the results from the AtenaWin have to be imported into GiD ga It is done by the clicking on the Import results from AtenaWin icon Then the process of importing will start see Fig 10 3 and when it is finished the model changes 1ts colours see Fig 10 4 GiD AtenaV4 Static 2D and 3D Interface Project 3DBeam 12 8 2009 structured mesh Files View Utilities Docuts View results Options Window Help results from AtenaWin into GiD y X4 Erro INS Lg e ue Ps EN 4 Far DEJ A JA J E nw PM j kl 5 RO NN NN ES up EA A o gi z k Pick LEFTMOUSE to rotate ESC to quit if present mouse wheel zooms Pick LEFTMOUSE to rotate ESC to quit if present mouse wheel zooms Command l Fig 10 2 The GiD postprocessor interface 49 User s Manual gt GiD AtenaV4 Static 2D and 3D Interface Project 3DBeam 12 8 2009 structured mesh cx AtenaConsole AtenaResults inp BE A Ml Job ATENA Closing output file 13 8 2009 18 34 44 Closing output file 13 8 2009 18 34 44 Closing output file 13 8 2009 18 34 44 k ESA d z K Reading 3DBeam 12 8 2009 structured mesh post Postp
61. ta Problem Data Problem Data or by pressing the mn The parameters for the retardation time generations are specified in this dialog The retardation times see 1 are also generated automatically It is only important to set them so that time in the parameter Retardation time for execution from precedes the first load time of the structure and time in the parameter Retardation time for execution to exceeds the last time of our interest in behaviour of the structure In addition the Number or retardation time per decade should somehow correlate with number of sample times per decade Otherwise we would violate balance in accuracy of individual approximations involved in the creep and shrinkage analysis The remaining cards data sheets of this dialog are the same as for usual static analysis Specifies the expected time range for the analysis should be smaller than starting time of the first Specifies the number of time steps per time unit in log scale to approximate the creep law for units of day typical value 1s 2 Specifies the end of the expected Problem Data VA time rage should be slightly larger gt FF than STOP TIME Global Settings Global Options Time and Transport WA SET RETARD TIMES PER DECADE 2 Specifies the number of integration RETARDATION TIMES FOR de times for the whole analysis as a 55 y EXECUTION TIMES FROM m o ee number of steps per time unit in the ENELUTION TIMES To 2000 se lo
62. umber of load steps and step multiplier can be entered It takes the last interval load step defined in GiD and repeats it The series of intervals defined in GID is extended by indicated number of intervals This generation is done after finishing GID modelling and before ATENA analysis The box in the bottom enables to activate writing data from all load steps to files The format of file name is ZaskName iii where TaskName is the name given the most top box and iii is the load step number ATENA GiD 30 Name to be used for any files generated by ATENA GID Problem Data interface Global Settings Global Options Time and Transport Short description Solution method for solving the nonlinear system Newton Raphson or Arc length TaskMame IMuT ask Tithe Short descr Method HNewton Hapheson Displacement Error 10 01 Residual Error a 01 Absolute Residual Error 10 01 Energy Error p O01 Iterator limit 30 Maximal number of iterations Optimize width Sloan Iteration criteria the value of 0 01 corresponds to 1 error in the corresponding criterion Method to be used for the element numbering optimization It helps to reduce the program memory requirements Stiffness type Tangent Predictor Assemble Stiffhess Matrix Each lteratian Solver LU i Liris Search Method Tangent or elastic stiffness can be used Elastic gives more robust convergence tangent gives faster conve
63. xecution should stop SET STOP TIME 35 SEC Set the final time of the analysis SET LAST TIME 35 SEC DYNAMIC ANALYSIS METHOD HUGHES ALPHA METHOD Dynamic analysis method to be used 1 HUGHES ALPHA 0 05 NEWMARK BETA 0 2505 Defines the Newmark s f NEWMABRE G MM 0 5 MK parameter the Newmark s yparameter and the Hughes DAMPING MASS COEFFICIENT 1 483 a damping parameter DAMPING STIFFNESS COEFFICIENT D Defines stiffness matrix Defines mass matrix coefficient for proportional coefficient for proportional damping a damninm Close Fig 9 1 Special dynamic Problem data properties This sheet is invoked by pressing the icon H The next dialog available by pressing is used to define method and parameters for dynamic analysis The remaining input data and corresponding data dialogs are similar to their form in other types of ATENA GID analysis They were already described earlier in this document see Section 0 47 User s Manual Interval Data i Basic Parameters Dinamic Analysis A description of load condition interval This helps to identify this interval in the ATENA input file LOAD MAME lei Can be used to scale all the condition values forces INTERVAL Multiplier for FIEC 11 displacements INTERWAL Multiplier for INCREMENT i O If selected a new set of solution W Generate Multiple Steps parameters can be specified for this Number of LOAD STEP IS
64. xxxx gt Linear and quadratic quadrilateral elements 4 nodes CCIsoQuad lt xxxx gt 8 nodes CCIsoQuad lt xxxxxxxx gt 9 nodes CCIlsoQuad lt xxxxxxxxx gt Linear and quadratic tetrahedral elements 4 nodes CCIsoTetra lt xxxx gt 10 nodes CCIsoTetra lt xxxxxxxxxx gt Linear and quadratic Hexahedron structured mesh 8 nodes CCIsoBrick lt xxxxxxxx gt 20 nodes CCIsoBrick lt xxxxxxxxXXXXXXXXXXXX gt 20 nodes CCAhmadElement32L9 special 3D element which externally looks as a 20 node brick but is internally formulated as a shell element Good element for large scale analysis of complex structures when large elements are needed such as bridges slabs etc The shell element is activated by assigning the Shell material to 20 node brick elements ATENA GiD 34 GiD AtenaV4 Static 2D and 3D Interface Project U Files View Geometry Utilities NEE Mesh Calculate ATENA Help A ed lt gt 20 Problem type B TFT Conditions SOLID Elastic Interval Data sath a Problem Data gt a SERN Data units BEAM Concrete 1D Reinforcement Local axes Interface s SNG Interval 20 nodes CCBeamNL this is another special 3D element available in ATENA This element on the input appears as standard 20 node element but internally it 1s formulated as a fiber beam element It is suitable for large scale analysis when meshes with large elements are necessary However ATENA is using a different nodal
65. y in the first step In GID dialogs for the boundary conditions the two types of conditions are distinguished by the check box Apply in Sub increment If it is checked the specified boundary conditions are assumed to be applied in all sub increments 1 e sub steps In case a loading should be applied only in the first sub step this box should not be selected There are several levels which affect the loading history definition Intervals this 1s the main level to define the loading history for the ATENA analysis Each interval consists of a set of conditions which are defined according to the Section 32 Load steps this is the level which is used in ATENA Each interval can include multiple load steps with the same boundary conditions Sub steps these are internal load steps which are automatically created by ATENA during the creep analysis in order to properly integrate the structural time response The number of these sub steps is affected by the choice of the sample times per decade see Fig 7 1 Conditions a A iad EL Constraint for Point Basic Coordinate System GLOBAL i Constraint W Constraint W Constraint Entities Unazsign Fig 7 2 Boundary conditions dialog in creep analysis 7 2 Material input data Each creep and shrinkage material consists of two parts a creep prediction model such as Bazant s B3 model and an ordinary short term material model for concrete such CC3DNonL

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