Release note
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1. USFOS Reality Engineering USFOS AS Phone 47 905 05 717 www USFOS com Enterprise No NO 986 827 374 MVA MEMO MEMO CONCERNS Release Notes USFOS Version 8 7 FOR YOUR ATTENTION COMMENTS ARE INVITED FOR YOUR INFORMATION AS AGREED FILE CODE CLASSIFICATION Confidential REFERENCE NO DISTRIBUTION Members of USFOS user group gt lt PROJECT NO DATE 2014 01 01 This memo contains project information and preliminary results as a basis for final report s UsFos AS accepts no responsibility of this memo and no part of it may be copied PERSON RESPONSIBLE AUTHOR Tore Holmas Release Notes USFOS 8 7 Jan 2014 NUMBER OF PAGES 19 1 2 Filusros a Reality Engineering INTRODUCTION ronron ani Gis seossesecosdcteseidecsocsccccesscsedascedetcectsesessssesdccessveesesoceotded es 3 CHANGES IN VERSION 8 7 ccccssssccsssscscccssssccccsssscccsessnscccsccssccccccsccccesesscesecssscscccensees 4 2 1 RESTRICTIONS ON SHELL ELEMENT ANGLES ccccceececeeeceeeeeeeeaeeeeeeeseeeaaeeaaecaaeeaaeeaaeeeaeeees 4 NEWS IN USFOS VERSION 8 7 2014 sccccssssscccsssscccscssscccssesscccesssseccccsssccecessecscesnnee 6 3 1 INTRODUCTION aiaa ce eE EAE ENEOU EO iek fasion america ethos 6 3 2 HOW TO UPGRADE YOUR USFOS VERSION cccccssseessssssssssssceessssscessssseseseesssseessnseseesesssseesses 6 3 3 ENHANCED GRAPHICAL USER INTERFACE cssssscscssss2. lt 10 Figure 2 1 Illegal small angles for 4 and 3 node shell Extreme small element corner angles are checked for If the angle is less than 10 UsFos will report this as an illegal angle and stop with an error message Following information are given e The elements are printed in the out file e The USFOS label file prefix _illegal_shell_angles us could be opened in xact and the illegal elements are shown The best option is always to modify the structural model and remove the bad shaped elements However if the user decides to keep the elements the ILLEGAL command could be used to bypass the check Figure 2 2 describes the recommended bypassing Specification one by one This option means that the user has an overview over important and less important elements which f ex remain elastic or have no practical load carrying function The option works as follows e A new minimum angle is defined by the user e The element to accept are listed The minimum angle could be re defined several times The commands are executed in the specified sequence Release Notes USFOS version 8 7 USFOS AS 2014 01 01 T lusros 5 19 Reality Engineering 3 Key 1 Opt Illegal ShellAngle Accept Redefine Min angle Key 1 Opt Illegal ShellAngle Elem Accept elem 1001 and 1002 Accept elem 2001 and 2002 Accept elem 3001 and 3002 Figure 2 2 Accepting elements with small angles Specification el
3. switch on special options and is extended in version 8 7 Following Switches commands are available subkeys in bold are new KeyWord SubKey Value Description Default bd General IndefLimit Min Max imperfection in CINIDEF Defaults Version ver 850 switch to version 8 5 defaults WaveData TimeInc val Time between each hydrodyn calc NoDoppler Switches OFF _ oppler effects NoStore Switches OFF storing of wave data for visualiz TidalLevel Level Specify Tidal Level Accuracy val Change accuracy 0 old accur 1 new accur a 0 05 1 870 SeaDim X Y dim Specify size of sea surface used in xact NodeData DoublyDef ON OFF ON Accept doubly defined nodes with same coo StatusPrint MaxElem val Max element in status print Iterations RLF_Calc Activate Residual Load Factor method Write FE_Model Case stp Writes deformed FE model at given case stp LinDepAlt Writes ZL springs for each BLINDP2 Solution FracRepeat MxRep Max fracture repeates PlateEdge ON OFF Avoiding I girder to buckle about weak axis if the beam element is attached to a plate element Impact UnLoFact Load factor during unloading after boat impact StrainCalc InclDent ON OFF OFF not included ON included Algorithm val 0 old 2 new incremental Visualization ON OFF Including Gradients ON OFF Results ShellComp val Number of shell results PoE WindData ReynDep ON OFF Switch to Reyno
4. the length could be changed using the Verify Vector Settings menu Clipping and display parts on of could be used to zoom into actual element s Result GLOBAL VECTOR GEVERIFY i H Nodal Mass i Applied Loads O Reaction Vector Nodal Loads H GLOBAL i BEAM Ti ector Settings 21x Settings Scaling Factos 5 tt i s S S S S J7 Relative to the Model s Extent Line Thickness 1 Color Show Arrow Heads I Filtering A Figure 3 4 Adjusting Arrow size Verify Vector Settings 44 44 A Figure 3 5 Use Clip and show parts on off to easier see actual elements Release Notes USFOS version 8 7 USFOS AS 2014 01 01 lf jlUSFOS a Reality Engineering 3 3 3 Visualization of Heavy Items Heavy items are normally modelled using one or more NodeMass definitions Node masses have been possible to visualize in xact for several years blue bars and the lengths reflect the relative magnitude However in order to improve the information from an analysis some new equipment mass definitions are introduced see user s manual In the USFOS analysis the masses from these 1 2 and 4 node mass elements are applied as usual node masses but in xact the items are visualized as shown below p u Figure 3 6 1 node equipment Two items are shown to the right C Figure 3 7 4 node equipment The 25 of the total mass per node Release Notes US
5. FOS version 8 7 USFOS AS 2014 01 01 TusFos 10 19 Reality Engineering 3 4 Tubular Joint Capacity Models 3 4 1 NORSOK Revision 3 A new capacity curve is added to the joint option Norsok Revision 3 This option is activated with the following ChJoint command x Node Chi Ch2 Geo Rule ChJoint 101 10 20 0 NOR_R3 Figure 3 8 Activating Norsok Revision 3 joint capacity 3 5 Earthquake 3 5 1 Delay Often ground motion time histories starts for time 0 0 If loads should be applied prior to the earthquake and this takes some time the earthquake could be delayed using the new option SWITCHES Earthquake Delay AT This means that all motion histories defined are delayed a certain time AT AT net Figure 3 9 Original Motion History left and delayed a time AT right Release Notes USFOS version 8 7 USFOS AS 2014 01 01 lusros wee Reality Engineering 3 5 2 Stretching Compressing When a structure experiences an earthquake ground motion the response is highly dependent on the dynamics If the ground moves with a period close to the fundamental eigen periods of the structure the response increases for every cycle Ground motions used in design are often based on recorded earthquakes adapted to the actual field In order to demonstrate the robustness of the structure these design Time Histories could be stretched and compressed as shown in Figure 3 10 The stretching and compression mean
6. PRNG2GR JNTRES Joint Strength overview Extended Version Needs version 8 7 or higher PILERES Total and Pile reactions from static analysis Needs version 8 7 or higher Table 3 2 Misc Utility Tools Release Notes USFOS version 8 7 USFOS AS 2014 01 01 Plusros ei Reality Engineering 4 Warnings and Hints 4 1 Joint modelling and Pile In Leg Warning When a pile goes inside a leg the pile is forced to slide inside the leg This is modelled in USFOS using the BLINDP2 command where the pile node becomes a slave and the nearest leg elements becomes the master element However sometimes the user defines 2 node springs between the pile and the leg instead If the spring is attached to a leg node which is used in connection with CHJOINT problems will occur The spring will become a brace and the load transfer through the joint will not work as intended 4 2 Use of Nonstru and Lin_elem Warning Often models created for linear elastic analysis are used directly for non linear ultimate strength analysis The quality of linear models varies much Some models consist of components with sufficient strength to carry the functional loads but too often the models are unable to carry the self weight The reasons could be several Early stage model concept level use of dummy elements and simply that the strength issue is pushed to the post processing code check stage When such problems occur it is tem
7. ccccccccssssccccsssssecccsscsecccssssecccssssseecessseccessasees 16 3 14 NEW MODIFIED INPUT COMMANDS cccccccccssssceccesssceccesssceeccessceeccessuseccccsseeccesssseccenasecs 16 31S DOCUMENTATION cecccos Gosvedstsceleceess cob este E EN AEE ce cleat aba Tea A etic celebs 16 WARNINGS AND HINTS i cccccsssoscccsscascscssessocessenecessessccsesecsssseetscccecdacccesedetesosesseossseedesossttes 18 4 1 JOINT MODELLING AND PILE IN LEG WARNING cccseeesssccecesecccsssssceesseseecensesnasssseees 18 4 2 USE OF NONSTRU AND LIN_ELEM WARNING ccsssseesseceesseceeseeeeeecensneceeaecenseeensneeenaees 18 4 3 BEAM HINGES HINT a a EEA N E sind Uevcedeoealb eit A TEON 19 Release Notes USFOS version 8 7 USFOS AS 2014 01 01 F lusFos 3 19 Reality Engineering 1 Introduction The current official version of USFOS is version 8 7 with release date 2014 01 01 The release contains the following a Release Notes this MEMO a Updated software on www usfos com a Extended examples library on www usfos com a Updated manuals on www usfos com Except for this MEMO no written information will be distributed in connection with this release All information is stored on the WEB Release Notes USFOS version 8 7 USFOS AS 2014 01 01 lusros 2 Reality Engineering 2 Changes in version 8 7 In order to improve the quality of the analysis results important changes are made 2 1 Restrictions on shell element angles Illegal angles
8. e same on win32 and win64 but the win64 version has access to more memory 3 3 1 All Time High Element results are changing during an analysis For example will the plastic utilization change during an earthquake simulation This new option makes it possible to create one all time high presentation up to the actual load level For example If the last stored load step in the analysis is selected the all time high for the entire analysis is displayed YERIEY g Thickness Yield Stress Hl E mod Mass Distribution ea Time High a Pe Plastic Utilization NG Temperature J Beam Plastic Strain il H Tri dLoads Figure 3 1 Verify All Time High menu Figure 3 2 presents the usual element plastic utilization at point for full load left and for a later step mid after unloading of the force The all time high right will remember the highest utilization of every member up to the actual load step Tosding and Unioading T iasgan Usang Dominadas i Full Load l Unloaded All Time High remembers Figure 3 2 All time high plastic utilization of cyclic loaded frame Release Notes USFOS version 8 7 USFOS AS 2014 01 01 T lusFos 8 19 Reality Engineering 3 3 2 Visualization of Local Axes The local Z axis of beam elements is visualized using Global Vector Verify Local Z Axis The arrow length is automatically set relative to the model size and
9. ecccsssssceceecssecccssssssesseseseecessnsssaeesseeees 7 3 3 1 ALL Tine Highs 33 rone ea a Boal Reed eels Bia e dead Seu tea eae 7 3 3 2 Visualization Of Local Axes cccssccssccessecssecssecesceesnecssecusceesceesaeesaeesceesaeesaeesseeeneeesaeeeas amp 3 3 3 Visualization Of Heavy terns cccccsscccssscccessccesnseessccsenscceesseceuseecusneessaaeceeseesuaneessaesenss 9 3 4 TUBULAR JOINT CAPACITY MODELS u ccccessssscceccsececcnsssccsececeecessesseeasseseccessnssaaesseees 10 3 4 1 NORS OK Revision Iseh na i oie BEE Si RE 10 3 5 BARTHOUARKE T csiccssceretit N AA E AA EAE eat ONR 10 3 5 1 Dela nn raa eni eee al vans a EE E E RT E OT 10 3 5 2 Stretchin g COMPVeSSING cccccccccccesscceesssesensecensecesnecseseeeseseccueeesueeceseseceuaeeseaeeeeaaeees Il 3 6 SUPPRESSING BUCKLING OF INTEGRATED PLATE I GIRDER ssccccccccesesesssssceeecceseeenssees 12 3 7 UNLOADING AFTER BOAT IMPACT o inari n e AARETE ETE ETEN 13 3 8 BUCKLING CURVES CINIDEE Jret anen a a aeeordi igos 13 3 9 LOAD PANELS FOR MAPPING TO FE ELEMENTS ccccccssssssscceseceeccssssseceessseecensnsaaaeseeees 14 3 10 PUSHDOWN ANALYSIS FIRE rsisi ioca tree dateverel oe aleve Gu ey adele a oa ae 14 3 11 LOCAL AXIS OF ZERO LENGTH SPRING ELMTRANS cssccesssceeeseccesteeeeseeesseeenseeesteeeeses 14 3 12 SWITCHES SPECIAL OPTIONS ccccccececessessovecccsntacessetesvacecesteceeanssendeccsncacevansssedacesets 15 3 13 UPDATES USFOS AND UTILITY TOOLS cccc
10. ement by element The lazy not recommended version is to accept all short elements without any specification A warning will be printed in the output file see Figure 2 4 i Key 1 Opt Value Illegal ShellAngle Accept 5 Redefine Min angle Key 1 Opt Illegal ShellAngle UsersRisk ON Accepting everything unchecked Figure 2 3 Accepting elements with small angles without element specification x oe x WARNING Unconditionally Acceptance of Very Small Angles on Users own Risk Figure 2 4 The warning is printed in the output file In the output file out the results from element checking are printed If illegal elements are found the analysis stops and an USFOS Label file name illegal_shell_angles usl is created By opening this file File Read Labels from file a label with the angle is attached to each illegal shell in the graphical presentation of the model Release Notes USFOS version 8 7 USFOS AS 2014 01 01 F lusros or Reality Engineering 3 News in USFOS version 8 7 2014 3 1 Introduction The new features are described by examples in this memo and in the updated manuals In addition to the usual platforms win32 LINUX and maxosx 64 version 8 7 is also built on win64 All utility software found under modules is built on 32bit platform and works therefore on both win32 and win64 computers 3 2 How to upgrade your USFOS version From release 8 6 USFOS could be upgrades in diff
11. erent ways a Alt 1 Download the new setup exe and u install install USFOS same as for release 8 6 This operation requires administrator rights on the PC This alternative is required if the 64 bit windows is installed a Alt 2 Download module by module and copy into the application folder typical C Program Files USFOS bin This operation requires write access on C but no administrator rights are required since no installation operations are performed just file copy With alternative 1 all modules and the on line manuals are updated For alternative 2 Win32 only following should be done a Download UsFOs module unzip and copy into C Program Files USFOs bin a Download xact complete package unzip and copy into C Program Files USFOSs bin a Download UsFOs and xact user s manuals Copy into C Program Files USFOs bin Alternative 2 means that the existing files located on the Application folder will be over written take a backup copy of the actual files if you want to keep your existing USFOS modules Similar procedure is used for other USFOS modules for example STRUMAN Release Notes USFOS version 8 7 USFOS AS 2014 01 01 T lusFros 7 19 Reality Engineering 3 3 Enhanced Graphical User Interface The graphical user interface xact has been enhanced since last year s release The GUI version released together with USFOS 8 7 is 2 7 for the Win 64bit version The functionality is th
12. ession load The image in the middle shows the behaviour with the weak axis buckling is suppressed The image to the right shows that the panel could buckle about the strong axis which the physical correct behaviour of this integrated structure Hi H f wot Wf li Suppressed buckling Buckling about strong Weak axis buckling e ey Figure 3 11 Stiffened Plate shell beam elements Release Notes USFOS version 8 7 USFOS AS 2014 01 01 lusros as Reality Engineering 3 7 Unloading after boat impact When a boat impact is completed reached the energy level specified in the BIMPACT record the impact force is unloaded to zero Originally the default increment during unloading was 0 1 but in version 8 7 this factor is reduced to 0 02 i e 50 steps if no step scaling takes place In addition to this changed default the user may control the load factor used during unload using the following command SWITCHES Impact UnLoFact loadFactor For example SWITCHES Impact UnLoFact 0 01 Unload 1 per step 3 8 Buckling Curves CINIDEF Some of the buckling curves are changed slightly to become consistent with respect to the use of factors load and material All buckling curves could be defined using the key words given in the manual The former NPD series are now renamed to EuroCode 3 Euro3_A Euro3_B etc Cinidef introduces imperfection also on I and Box sections The strong axis parameters are u
13. ld number dependent Cd EarthQuake Delay Val Delays earthquake with specified time Stretch Val Stretches the motion history with specified value Table 3 1 SWITCHES options Release Notes USFOS version 8 7 USFOS AS 2014 01 01 FIUSFOS Reality Engineering 3 13 Updates Usfos and Utility Tools News corrections and updates are described on the web and it is recommended to check the following link http www usfos no news index html 3 14 New modified input commands Since last main release 8 6 following input identifiers are added extended PushDown LoaField Equip_IN Equip_2N Equip_4N CHJOINT SWITCHES ELMTRANS 3 15 Documentation New command New command New command New command New command Extended command Extended command Extended command 16 19 Fire Degradation analysis Load Field 1 Node Mass Object 2 Node Mass Object 4 Node Mass Object Norsok Revision 3 joint curves See above The following documentation updated or new is available on the web User s manual Oooo PILERES users JNTRES user s manual d2p user s manual s manual Release Notes USFOS version 8 7 Updated document New New New USFOS AS 2014 01 01 T lusFos 17 19 Reality Engineering Tool Description Comment Converts nodal displacements nodeID 6 displacement d2p components to prescribed or forces displacement input to USFOS NODEDISP or NODELOAD S
14. or examples Release Notes USFOS version 8 7 USFOS AS 2014 01 01
15. pting to fix the model using NONSTRU and LIN_ELEM commands Use of these commands in that context is another words for saying My model is not suited for non linear analysis The NONSTRU command was introduced for member importance studies where one or more elements were removed and the impact on the ultimate capacity was checked Controlled use seldom causes problems but defining whole areas non structural could cause concentrated load transfer into the remaining structure and then cause new problems The best solution is always to strip the model for surplus elements but sometimes a careful change of material properties increase yield and reduced stiffness could be a good solution The LIN_ELEM command could be replaced by a re definition of the material for example scaling the yield with a certain factor This gives a better control of the non physical areas of the structure Material properties are easily changed using the CHG_MAT command where the actual elements also could be referred to using the Group option Release Notes USFOS version 8 7 USFOS AS 2014 01 01 F lusFos 19 19 Reality Engineering 4 3 Beam Hinges Hint Beam hinges could cause numerical problems if a group of elements give zero stiffness If is possible to replace one hinge with a zero length spring one extra node Struman has an option for automatic generation of springs the new Hing2Elm commands Contact support USFOS com f
16. s that the time axis is scaled with a factor gt 1 stretching or lt 1 compressing By for example running the simulation with 30 stretching factor 1 3 and 0 7 it could be demonstrated that possible resonance periods are checked Figure 3 10 Original Motion history left Stretched mid and Compressed right By specifying the command SWITCHES Earthquake Stretch Factor All motion histories are stretched compressed with the same factor Release Notes USFOS version 8 7 USFOS AS 2014 01 01 T lusFos lene Reality Engineering 3 6 Suppressing buckling of integrated plate I girder The USFOS beam column element predicts the correct buckling with only one element per physical member When needed a mid node is inserted internally and the element is split into two 4 elements This is normally an advantage since the user does not need to worry about mesh density to obtain the correct ultimate capacity However in some cases this local member buckling is not wanted For example If an I girder is continuously welded to a plate the girder is suppressed from buckling about the weak axis Only buckling about the strong axis is possible By specifying SWITCHES Solution PlateEdge ON USFOs will search for I girders attached to plates and suppress buckling about the weak axis of the I girder Figure 3 11 demonstrates an axially loaded panel where the two I girders buckle in a non physical manner for a relatively low compr
17. sed in the buckling formulas Release Notes USFOS version 8 7 USFOS AS 2014 01 01 lusros mere Reality Engineering 3 9 Load Panels for mapping to FE elements If for example an area load or explosion pressure should be mapped to a large number of shell elements the new LOAFIELD option could be useful Shell elements located closer to the panel than a certain user defined tolerance will get the actual pressure The load orientation will follow the direction of the load panel unaffected about the local sequence numbering of each shell element 4 shell elements 1 load panel Shells and Panel 3 10 PushDown analysis fire If fire degradation analysis should be performed the PushDown command is recommended This command will modify every element s section capacities based on the actual temperature field This new option is an extension of the existing FireChk option and is prepared for more detailed cross section temperature data from FAHTS 3 11 Local Axis of Zero length spring ElmTrans In addition to the more general definitions of the main element for definition of the local coordinate system of a zero length spring a direct definition is available The keyword MainBeam is used to specify the element See User s manual Release Notes USFOS version 8 7 USFOS AS 2014 01 01 lUSFOS Reality Engineering 3 12 SWITCHES Special Options 15 19 The command SWITCHES was introduced in 8 5 to
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