High-performance Abaqus simulations in soil mechanics.docx

《High-performance Abaqus simulations in soil mechanics.docx》由会员分享，可在线阅读，更多相关《High-performance Abaqus simulations in soil mechanics.docx（6页珍藏版）》请在课桌文档上搜索。

1、High-performanceAbaqussimulationsinsoilmechanics2008baqsUsersConference11modelledinathree-dimensionalsoi1continuumconsistingof69401finiteelements,78179nodesandaltogether234543d.o.f.s,seeFigure7a.Almostoptimalefficiencycouldbereachedwithbaqus6.6withupto16processorsusingthedonainleveldecompositionalgo

2、rithm.TheresultsconcerningthechangesinthestatevariablesofthesurroundingsoilcanbefoundinHenkeandGrabe(2006).Thispublicationalsodiscussestheeffectsofdrivingapileinthecenterofanexistingpilegroup.Figure7.Abaqusmodelforsimulationofpiledrivingintosubsoil.4.4OptimizationofaquaywallconstructionusingAbaqUS/S

3、tandardandMT1.Bquaywal1witharathersimplecombinedsheetpiIewallisregardedasshowninFigure9.Thedesignofsuchsheetpilewal1constructionsisamultipurposeoptimizationprocess.Clearlydefinedrequirementsontheconstructionarefacedwithapluralityofpossiblevarietiesofstaticsystems.Highlyreduced,theconstructionprocess

4、iscomposedofthedeterminationofanchor-andsheet-pile-profileaswellaschoiceoftheanchorinclinationandthegradeofrestraintprovidedbythesoil.TheobjectivesarethetonnageofsteelwhichisrelatedtothetotalconstructioncostsandthehorizontaldeformationofthesheetpileheadasaparameterfortheServiccabilityoftheconstructi

5、on.safirststepintheanalysistheconventionalverificationsforachosensetofparametersareenforced.Thetonnageresultsdirectlyfromthestressanalysisintheultimatelimitstate.122008AbaqusUsersConferenceFigure8.MeasuredspeedupforAbaqusjobsrunningonSMParchitectures.Figure9.Quaywallconstructiontobeoptimized.Foramor

6、erealisticsurveyofthesoi!-structureinteractionandthedeformationbehaviourthehorizontaldeformationofthepileheadiscalculatedbyAbaqus.Thereforeaparameterized,easymodifyingmodelisgenerated.Themodelisseparatedintoregionswhicharedeterminedbydi-mensionschosenbytheoptimizationalgorithm.regularmesh,controlled

7、byauserspecifiedglobalelementsize,isgenerated,seeFigure10.Theintermediatestepsoftheconstructionprocessaremodelledaswe11.A1valuesdependonfractionsoftheconstructiveheightofthequaywall.Inadditiontothedimensionstheprofilesarevariedbychoosingdifferentmaterialparametersforthe13anchorstiffnesskandthemoment

8、ofinertiaIaswellasthecross-sectionareaAofthesheetpilewall.Toallowasmartperformanceoftheoptimization,itisnecessarytogenerateameshyieldingmoderatewallclocktimes.Formercalculationsindicatethatanumberofapproximately500nsimulations(wherenisthenumberofobjectives)seemstobesufficient.Byanalyzingautomati-cal

9、Iyamultiplicityofvarioussystemsaneffectiveoptimizationoftheconstructionistheresultoftheanalysis.Figure10.Abaqusmodelforcalculationofthehorizontaldeformationofthesheetpilehead5Summary11couldbeshownthatAbaqusbuilt-infeaturesandbaqusextensionsbasedonusersubroutinesandcouplingWithexternalprogramscanbeap

10、pliedtoso1veawiderangeofboundaryvalueproblemsinthefieldofsoi1mechanics.Thisoffersresearchersatooltoexaminesomeoftheopenproblemsingeomechanicsliketheinfluenceofconstructionprocessesforgeotechnicalconstructions,theoptimizationofgeotechnicalconstructionsregardingdeformationsortheoptimizationofconstruct

11、ionprocesses1ikepenetrationofstructuresintothesubsoil.Itshouldnotbeconcealedthatthepresentedsimulationshavelimitscausedbymodel1ingfeaturesandhardwareresources.TheneedoffuturerequirementsonAbaqusfeaturescanbesummarizedasfollows:implementationofbuilt-insophisticatedconstitutivemodelsforSOils,improvedn

12、umericalstabi1iIyforlargedeformationproblemse.g.withmodern1.Econceptsandfinallyenhancedefficiencyinparallelcomputationsasalreadyshowninthelastbaqusrevisions.142008AbaqusUsersConferenceReferences1.Alsaleh,M.,NumericalmodellingofstrainlocalizationingranularmaterialsusingCosseratTheoryenhancedwithmicro

13、fabricproperties.PhDthesis,Dep.ofCivilandEnvironmentalEngineering,1.ouisianaStateUniversity,2004.2.Arnold,M.,ZurBerechnungdesErd-undAuflastdrucksaufWinkelsttzwndeimGcbrauchszusland,Promotionsschrift,MitteilungendesInstitutsfrGeotechnikderTechnischenUniversittDresden,Hcft13,2004.3.Arslan,H.,1.ocaliza

14、tionanalysisofgranularmaterialsinCosseratelastoplasticityformulationandfiniteelementimplementation,PhDthesis,Dept,ofCivil,EnvironmentalandArchitecturalEngineering,UniversityofColorado,2006.4.Dunne,F.andPetrinic,N.,Introductiontocomputationalplasticity,OxfordUniversityPress,2005.5.Gudehus,G.,comprehe

15、nsiveconstitutiveequationforgranularmaterials,SoilsandFoundations,31(1):1126.2008baqusUsersConferenceGutjahr,S.,OptimierteBerechnungvonnichtgesttztenBaugrubenwndeninSand,Proinotionsschrift,Schriftenreihedes1.ehrstuhlsBaugrund-CrundbaudcrUniversittDortmund,Heft25,2003.7.Hagen,C.,FEM-BEMcouplingbymean

16、sofAbaqusandusersubroutines.Internalreport,InstituteofGeotechnicsandConstructionManagement,HamburgUniversityofTechnology,2005.8.Helwany1S.,Appliedsoilmechanicswithbaqusapplications,JohnWileySons,2007.9.Henke,S.,Grabe,J.,SimulationofPiIeDrivingbyThreedimensiona1FiniteElementanalysis,Proc.Of17thEurope

17、anYoungGeotechnicalEngineeringConf.,Zagreb,Crotia,ed.byV.Szavits-Nossan,CroatianGeotechnicalSociety,pp.215233,2006.10.Henke,S.,Hgel,H.M.,RumlicheAnalysenZUrquasi-StatischcnunddynamischenPenetrationvonBauteilenindenUntergrund.Tagungsbandzur19.deutschsprachigenAbaqusBenutzerkonferenzinBaden-Baden(Germ

18、any),2007.11.Holler,S.,DynamischesMehrphasenmodellmitHypoplastischerMaterialforinulierungderFeststoffphase,Promotionsschrift,Verffentlichungendes1.ehrstuhlsfrBaustatikundBaudynamikderRWTHachen,Heft06/2,Wissenschaftsverlag,achen,2006.12.Huang,W.,Bauer,E.,Amicropolarhypoplasticmodelforgranularmaterial

19、sanditsFEMimplementation,Proc,ofthe1stAsian-PacificCongr.onComp.Mech.(APCOMOl),eds.S.ValliappanandN.Khalili,Sydney,Australia,ElsevierScience1.td.press,11351140,2001.13.Kelm1M.,NumerischeSimulationderVerdichtungRohsionsloserBdenmitVibrationswalzen,Promotionsschrift,VerffentlichungendesInstitutsfrGeot

20、echnikundBaubetrieb,TUHamburg-Harburg,Heft6,2003.2008AbaqusUsersConference1514.Kinzler,S.：Knig,F.,Grabe,J.,EntwurfeinerPfahlgrndunguntcrAnwcndungderMchrkriIerien-Optimierung,Bauingenieur,82(9):367379,2007.15.Kinzler,S.,Grabe,J.,WirtschaftlicheOptimierungrckverankerterSpundwandkonstruktionen,Tagungsb

21、andzumWorkshopOptimierunginderGeotechnikStrategienUndFallstudien,VerffentlichungendesInstitutsfrGeotechnikundBaubetriebdorTechnischenUniversittHamburg-Harburg1Heft12,S.6186,2006.16.Maier,T.,NumerischeModellierungderEntfestigungimRahmenderHypopIastizitt,Promotionsschrift,Schriftenreihedes1.ehrstuhlsG

22、rundbauundBaugrundderUniversittDortmund,2003.17.Mardfeldt,B.,VerformungsverhaltenvonKaimauerkonstruktionenimGcbrauchszustand,Proniotionsschrift,VcrffentlichungendesInstitutsfrGeotechnikundBaubetriebderTechnischenUniversittHamburg-Harburg,Heft11,2005.18.Morra,G.,Chatelain,P.,Geodynamicsmodellingthrou

23、ghcouplingbaquswithanacceleratedBoundaryElementMethod,Proc,of1stInt.GeoscientificbaqusWorkshopinBochum(Germany),200619.Niemunis,A.,Herlc,I.,Hypoplasticmodelforcohesionlesssoilswithelasticstrainrange,MechanicsofCohesive-FrictionalMaterials,2(4):279299,1997.20.Niemunis,.,Extendedhypoplasticmodelsforso

24、ils,Habi1itationsschrift,VerffentlichungendcsInstitutsfrGrundbauundBodenmechanikderRuhr-UniversittBochum,Heft34,2003.21.Nbel,K.,Experimentalandnumericalinvestigationofshearlocalizationingranularmaterial,Promotionsschrift,VerffentlichungendesInslitutsfrBodcnmechanikundFelsmechanikderUniversittKarlsru

25、he,Heft15922.Slominski,C.,ValidierungvonRechenmodcllcnzurScherzonenentwicklungmitVersuchenim1.aborundinsitu,Promotionsschrift,VerffentlichungcndesInstitutsfrBodenmechanikundFeldmechanikderUniversittKarlsruhe,Heft169,2007.AcknowledgementTheauthorswishtothankNorthernGermanNetworkforHigh-PerformanceComputing(hlrn.de)forsupportofhardwareresources.Theresearchprojectpenetrationofstructuresintosubsoi1issponsoredbyGermanResearchFoundation(dfg.de).PicturesinSection4.1and4.2werekindlymadeavailablebyM.KelmandB.Mardfeldt.