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Example #1 - GeoSoft - programs for geotechnical calculations

1. 18 861 388 WNodes 0 Elements 0 5 Point deleting There are three ways to delete points 1 Press button in Points group on Model page then select a point by mouse and press LMB 2 Select a row in Point table box and press button 3 Check a point selection item in Selection group then select points by frame pressing LMB and press Delete HR H T LIME O 2012 Alterra GmbH 2 3 GEODE Alterra 6 Line creating There are two way to create lines 1 Press j button in Lines group on Model page then join points by LMB A previous line end is a next line origin To complete polylines creation press RMB or uncheck i button When lines are added input field has the following view Alterra D WorkDirectory Temp Example 1 Examople 1 Processor Results X 33 833 18 750 988 Nodes 9 Elements 0 24 O 2012 Alterra GmbH GEO Example 1 Alterra 7 Line deleting There are two ways to delete lines 1 Press ee button in Lines group on Model page then locate cursor on line and press LMB 2 Check a line selection item in Selection group then select lines by frame pressing LMB and press Delete E a oo r a m 8 Area creating There few ways to create areas 1 Press button in Areas group on Model page All closed convex areas will be found automatically 1 Select line Lal Select contour Al Automatic creation Note If some areas are n
2. Alterra D WorkDirectory T emp Example 1 Example 1 Model Grid Stages Processor Results X displacement X strain Elastic X stress Moment K Initial condition Initial stage Y displacement Y strain Plastic Y stress Shear force Scale 2 Current stage Shear Total a o Ca Moment N m Alterra X 20 149 Y 18 426 988 Nodes Gen Elements 1233 Calculation 0 8 sec H 36 O 2012 Alterra GmbH
3. Alterra GmbH tel 41 44 825 05 55 www geo soft ch info geo soft ch Alterra 1 2 2 Program for FEM geotechnical calculation 2012 Alterra GmbH can changed this document without prior notification Any part of this document connot be reproduced or transmitted in any form by any ways for any purposes without written agreenment with Alterra GmbH 2012 Alterra GmbH All rights reserved GEO ELELM Alterra Contents Introdution 4 Material Models 5 1T Emear elaSUC MO E 5 2 Elastoplastic Mohr Coulomb yield criterion material model NEEN EEN N 5 3 Double hardening Mode ista Al 5 4 Elastoplastic Mises yield criterion material model KENNEN EEN 6 Software overview 7 Ay MAIN A o O A 8 2 NIDDON BE 12 Example 1 18 1 NEW te E EE 18 2 OPEN EE 19 SEP gg wdd stada Gre cd d dad zc cod se cescosasesteceaeegeecnecesecsaeeasmeses 21 A PON EE EE 22 D POIMCACIO NO wata a a O ci Gia SP R R aid 23 6 LINE CC AMIN wci io e 24 T LINE JEILEUNO EE 25 O Area creatina 25 CNR OT du iria oda 26 10 Physical mechanical properties of materialS ooococccoccccccoccncccancncccnnnnnananancncnnancnrnnancnnnzs 27 11 SCFOSS SECUION DEES 28 12 Material property SPeciVINO uciac aa aid 29 13 NR EC Une EE 32 14 BOUNdary e e Ur e Sesa a 33 19 Calculado al lod 34 16 TUE E EE 35 O 2012 Alterra GmbH 3 GEOE ms Alterra Introdution Alterra is a program for geotechnical analysis based on finit
4. Coulomb yield criterion material model for soil The material have the following properties c 8 kPa soil cohesion 14 internal friction angle E 12 MPa deformation modulus of soil v 0 42 Poisson ratio k 10 unloading ratio 2012 Alterra GmbH 2 7 Alterra Materials Material name Steel s_ v Elasto plastic model with Mohr Coulomb criterion Cohesion 8000 Pa Friction angle 14 Deformation modulus 12000000 Pa Poisson ratio 0 42 Discharge factor 10 _ Double hardening model 11 Cross section properties Beam cross section properties are specified in the following box Cross sections Inerta moment Section moment Height Retaining wall consists of beam 30 with 1 m spacing S 0 00465 m cross section area 2 8 O 2012 Alterra GmbH GEO Example 1 Alterra 0 708 10 m cross section inertia moment It is not necessary to specify Cross section thickness if you specify area and inertia moment of cross section Cross sections No Name O 2T Iran 30 0 00465 Inertia moment 7 08E 5 section moment 0 000427 Height 12 Material property specifying Select an area by double click this area will change its color Press RMB and select Material gt Soil points in pop up menu 2012 Alterra GmbH 29 Alterra Processor Results All Selected i Material Cross sections Structure 5 Pa models F F
5. a w o Fs 0 _ Specify gt o Cu y GU Specify boundary conditions as follows O 2012 Alterra GmbH 3 3 Alterra akwa u Allge a Processor Results Create OG Insert el C Delete na JA Delete P P 1000 Pa 1000 Fa X 26 944 19 194 588 Nodes 669 Elements 11233 15 Calculation When finite element mesh is created and all materials are specified let us pass to Solver page Input two parameters in Calculation parameters group n 1000 iteration number max iteration number per one stage k 1 H stop criterion max unbalanced force per one stage Iteration number 1000 Stop criterion 1 Select Plane strain point in Deformation mode group Plane strain Axial symmetry Press Calculation button 3 4 2012 Alterra GmbH GEO Example 1 Alterra gt Salve 16 Result output The program allows estimating stress and strain behaviour of soil A is oe a UNE Alterra D WorkDirectory Temp Example 1 Example 1 Model Grid Stages Processor Results X displacement X strain Elastic X stress Moment a Initial condition Initial stage Y displacement Y strain Plastic Y stress Shear force Scale 2 Current stage All Shear Total a o Ca Total displacements m M 25 769 V 23 102 aaa Modes 669 Elements 1233 Calculation 0 8 sec and retaining wall O 2012 Alterra GmbH 3 5 GEDE A kb KR Ss Es A zs
6. allows quickly accessing to visualization options Processor Results 10 K 9 A Y S ce Ak Y Oy 3 PAK All Selected See Al Selected Material Cross sections Structure Generate SC S q 1 models mesh E a ALL PIES I Pe ME LET Ia H EN F EN This page contains the following button groups DG 3 R Ka 1 All Selected zg e Mesh parameters allows specifying discretization parameters These parameters can be specified for a certain line or for all lines Discretization parameters e node numbers in line and node concentration ratio 2012 Alterra GmbH 1 3 Geol Alterra e element fixed size in line e A Element types allows selecting element type simplex triangular six node or beam and specifying it for a certain area line or for all areas lines a Material Cross sections Structure models Model characteristics Materials button opens a box for specifying material properties Materials axa Models Density Ne Material name Linear elasticity kg New material _ JElasto plastic model with Mises criterion JElasto plastic model with Mohr Coulomb criterion _ Double hardening model Cross sections button opens a box for specifying beam cross section properties 1 4 2012 Alterra GmbH GEOERIAS Software overview Alterra Cross sections Inertia moment Section moment Height Generate mesh a button whic
7. are overview Alterra Axial symmetric a im E SS SER z Model Grid Stages Axial N MomentMB Scale 10 i Current stage Ur displacement zy strain Plastic gt el j Element output delia silo A EA strain Total O 2012 Alterra GmbH 4 7 Geol Alterra Example 1 This example describes a simple cantilevered retaining wall 1 New project A new project can be created by menu item Ctrl N New project Open Ml Save Ki SAVE as ES Close service Help gt New project menu item opens a dialogue box in which you should select a folder to save project files name a project press Save button 1 8 2012 Alterra GmbH Example 1 Alterra Look in O em My recent Documents 3 Desktop My Documents My Computer File name Example 1 alt w My Network Files of type Project files ALTERRA w 2 Open project For further work in previously created project it is necessary to open it from File submenu Ctrl O New project A SAVE Ki Save a5 ES Close service O 2012 Alterra GmbH 19 Geol Alterra Open project menu item opens a dialogue box in which you should select a folder which contains previously created project select a project file press Open button Mw recent Documents My Documents My Computer ef File name Example 1 alt My Network F
8. e element method The main feature of Alterra is calculation of ground base structure system mode of deformation and strength and stability analysis in plane or axisymmetric formulation The program is developed for solving difficult geotechnical problems construction maintenance and reconstruction of structures Three different material models for soil and elastoplastic Mises yield criterion material model for steel are used in this program Program features e Complex simulation of combined action of ground base structure system e Stress strain behaviour analysis taking into account plastic strains e Staged construction and excavation e Retaining wall analysis e Internal CAD editor or DFX file import e Computation of settlement and mode of deformation of structures e Analysis of creeping landslide e Analysis of internal forces in anchors and struts e Analysis of subsidence trough e Analysis of pile strength and bearing capacity A O 2012 Alterra GmbH GEO EAS Material Models Alterra Material Models Three different material models for soil and one material model for steel are used in this software 1 Linear elastic model 2 Elastoplastic Mohr Coulomb yield criterion material model 3 Double hardening model 4 Elastoplastic Mises yield criterion material model 1 Linear elastic model The most simplified and the most popular material model with linear relationship between stress and strain is defined by tw
9. h starts finite element mesh generation 1 Stages Model Grid oi 0 e o SCH O Ip 0 Specify Delete FM u a Boundary conditions allows adding or deleting boundary conditions in lines and points Create x Delete Stages allows creating or deleting calculation stages Create button creates a new stage at the end of stage list Insert button creates a new stage and insert it after a current stage 2012 Alterra GmbH 4 5 Geol Alterra Delete button deletes a current stage Stage navigator allows stage list navigating 1 Processor gp Kk ES A s Model Grid Stages Results Iteration number 20 Plane strain Stop criterion 1 Axial symmetry CEIT Teal Ga Tie CIU m ontains the following button groups The page c Iteration number 20 Stop criterion 1 Calculation parameters Deformation mode allows selecting type of calculation plane strain or axial symmetric gt Solve l Solution starts calculation 1 Results Results page view depends on type of calculation Plane strain Fai ESA Model Grid Stages Processor Y displacement Y strain Plastic Y stress Shear force Scale 10 Current stage Total Shear Total Tangential Deflections Element output qa m PI WH F E cn posing of stage 1 6 O 2012 Alterra GmbH GEO ELIAS Softw
10. iles of type Project files ALTERRA Cancel Use Recent docs submenu for quick project access 2 0 2012 Alterra GmbH Example 1 Alterra Recent documents 0 D WorkDirectory Temp Example 1 Example 1 alt 1 D WorkDirectory Temp Example 1 alt 2 D WorkDirectory Temp Example alt 3 D WorkDirectory Temp Example3 alt File Service Help 3 Grid option To create model by mouse there is an option of grid display activated by button or F9 in status bar Cursor moves discretely in grid Grid parameter settings can be specified in Settings box on Grid page karze Grid Other settings Grid spacing X spacing Y spacing Grid field X left Y bottom X right Y top _JGrid on 2012 Alterra GmbH 2 1 GEOE ms Alterra 4 Point adding There are three ways to add points a 1 Move to Model page press button in Points group and add points in input field by mouse 2 Press Additional button on Model page D D a M ir pa s In appeared Point table box input point numbers and point coordinates manually Point table 3 Import geometry from DXF file It is necessary that DXF file contains only points and lines not polylines When points are added input field has the following view 2 2 O 2012 Alterra GmbH Example 1 Alterra kb KR Ss Es A Alterra D WorkDirectory Temp Example 1 Example 1 Stages Processor Results X 31 833
11. inite element type P Material Eliminate X 28 056 Y 4 861 Nodes 0 Elements 0 After specifying selected area changes its color which corresponds to specified material 3 0 2012 Alterra GmbH Example 1 Alterra Results Ak Al Selected Selected Material Cross sections Structure Generate models mesh X 35 274 18 791 588 Nodes 0 Elements 0 Material for the next area and lines which simulate retaining wall is specified in the same way O 2012 Alterra GmbH 3 4 Alterra Stages Processor Results All Selected m Material Cross sections Structure Generate d models mesh X 32 062 Y 18 957 888 Nodes 0 Elements 0 13 Mesh creating When element size for all lines and element type for all areas are specified press Create a mesh button in Mesh group on Mesh page COZAATE CETKY After that the model is meshed into finite elements in our case they are simplex element simulating soil and beam element simulating retaining wall 3 2 2012 Alterra GmbH Example 1 Alterra ran a zm ui oe ML Allert a Ilu Processor Results ZK Al Selected ee Al Selected Material Cross sections Structure Generate 4 models mesh P Nodes 0 Elements 0 Mesh 891 msec 14 Boundary conditions It is possible to specify loads or displacements as boundary conditions Using Boundary conditions group on Stages page JL laj o WW o
12. itive Compressive stress is negative General option settings DXF file import itis necessary that DXF file contains only points and lines not polylines Help submenu service Help shows user manual F1 About shows information about software version and developer contacts 2012 Alterra GmbH 1 1 GEODE Alterra 2 Ribbon Ribbon consists of the following pages 1 Modeling NAA oe Ae Grid Stages Processor Results w oint E The page contains the following button groups a a m oO p ei Points allows creating deleting copying or moving points Create point button contains different methods of point creation Sa Create point a Create point on line Lines allows creating or deleting lines Create line button contains different methods of line creation Sp JE i Segment w Polyline wel Spline AR Cross segments 1 2 O 2012 Alterra GmbH GEOEIAS Software overview Alterra Areas allows creating or deleting areas Create area button contains different methods of area creation Il Select contour Al Automatic creation u Selection defines which objects points lines areas are to be selected by frame e Bio ZS Eet em Ig R ALL e Objects
13. o values E modulus of elasticity Pa v Poisson ratio 2 Elastoplastic Mohr Coulomb yield criterion material model Elastoplastic model using parameters which are defined during soil laboratory testing The parameters c cohesion Pa angle of internal friction E modulus of deformation Pa v Poisson ratio k discharge factor 3 Double hardening model Double hardening model is elastoplastic model which uses parameters defined during soil laboratory testing and pressure deformation curve defined during soil compression testing 2012 Alterra GmbH 5 GEOE ms Alterra This model is based on the principle of stress and strain behaviour increase at hydrostatic pressure increase The parameters c cohesion Pa angle of internal friction v Poisson ratio A P hardening curve fitting parameters k discharge factor E Aln o Po Po 4 Elastoplastic Mises yield criterion material model Elastoplastic Mises yield criterion material model for steel The parameters E modulus of elasticity Pa v Poisson ratio 9 5 yield point Pa 6 2012 Alterra GmbH GEOEIAS Software overview Alterra Software overview Main form has the following view Alterra D WorkDirectory Temp Example 1 Example 1 Grid Stages Processor Results X 110 170 Y 13 217 888 Nodes 669 Elements 1233 Main form consists of the following elements e Main Men
14. ot created automatically it is necessary to create them manually Ld 2 Press button in Areas group on Model page Select lines by LMB and press RMB These lines should form closed convex area When areas are added input field has the following view 25 2012 Alterra GmbH Alterra kb KR Ss Es A Alterra D WorkDirectory T emp Example 1 Example 1 Grid Stages Processor Results X 34 778 18 694 988 Nodes 0 Elements 0 9 Area deleting There are two ways to delete areas 1 Press 2 button in Areas group on Model page then locate cursor on line and press LMB 2 Check an area selection item in Selection group then select areas by frame pressing LMB and press Delete Um Sep 8 E CH m 2 6 2012 Alterra GmbH GEO Example 1 Alterra 10 Physical mechanical properties of materials Press in Material properties box to create a new material Press button to delete material Let us add two materials such as steel and soil Choose linear elastic model for steel The material have the following properties E 210 GPa elasticity modulus of steel v 0 3 Poisson ratio Materials Models Density Material name EN Linear elasticity Steel Soil Elastic modulus 2 1e11 Poisson ratio 0 3 JElasto plastic model with Mises criterion JElasto plastic model with Mohr Coulomb criterion Double hardening model Choose elastoplastic Mohr
15. u e Ribbon e nput field O 2012 Alterra GmbH 7 Geol Alterra 1 Main menu Main menu consists of the following points File View Service Help Recent documents File 0 D WarkDirectory Temp Example 1 alt 1 D WorkDirectory Temp Example2 alt 2 D WorkDirectory Temp Example3 alt Service P Help File subm enu New project A SAVE Ki Save a5 ES Close service New project creates a new project Ctrl N 8 O 2012 Alterra GmbH GEO EAS Software overview Alterra Open opens a dialogue box of previously created project Ctrl O Save saves the current project Ctrl S Save as opens a dialogue box of current project saving under a new name Close closes a current project Service submenu settings Model import from DXF file Settings opens a settings box O 2012 Alterra GmbH 9 Alterra settings Grid spacing Grid field X left Y bottom _JGrid on Grid option settings settings Displaying objects Object numbering View points Point numbers View line Line numbers View areas Area numbers View nodes Node numbers View elements View all _ Marking of all objects Design model visualization settings 2012 Alterra GmbH 10 Software overview Alterra settings Other settings Color scheme Diagram scaling 2 Output result settings a Compressive stress is pos

Example #1 - GeoSoft - programs for geotechnical calculations

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