MAT_CONCRETE_DAMAGE_REL3 挡墙的流固耦合碰撞.pdf

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1、th®10InternationalLS-DYNAUsersConferenceSimulationTechnology(1)ModelingandSimulationofBogieImpacts®onConcreteBridgeRailsusingLS-DYNAAkramAbu-OdehAssociateResearchScientistTexasTransportationInstituteTheTexasA&MUniversitySystemCollegeStation,TEXAS77843-3135AbstractBridgerailsareconstr

2、uctedtocontainandredirectanerrantvehicle.Theyareconstructedtowithstandtheimpactseverityofsuchvehicularimpactbasedonthedesiredcontainmentlevel.Toevaluatethestructuralintegrityofagivenbridgeraildesign,bogietestswereconductedusinga5000lbbogieasanimpactor.Inthispaper,LS-DYNAwasusedtomode

3、ltheconcretebarriertosimulatethebogieimpact.ThreematerialmodelsinLS-DYNA(type72R3,84and159)wereusedtosimulatetheimpactevent.Therebarstoconcretecouplingwasmodelingviathe*CONSTRAINED_LAGRANGE_IN_SOLIDfeatureinLS-DYNA.TimehistoryanddeformationprofilecomparisonsbetweentestsandLS-DYNAsimu

4、lationsarepresentedinthispaper.Figure1belowshowsadamageprofileforthebarrierastestedandassimulatedinLS-DYNA.Figure1Damageprofileofaconcretebarrierafteranimpacttest(left)andanimpactsimulation(right).IntroductionConcretebarriershavebeenextensivelyusedinroadsidesafetyapplications.Inthepa

5、st,finiteelementanalystsmodeledthesebarriersusingrigidorelasticmaterialcharacterizationfortwomainreasons.Firstreasonhastodowithcomputerhardwarespeedandthusanalystswouldsavetimebyassumingrigidorelasticmaterialbehaviorfortheconcretebarriers.Theotherreasonwasthelackofsuitableconstitutem

6、odelthatcapturesthebehaviorofconcretewhilenotbeingoverwhelminglydifficulttouse.Although,thereareseveralmaterialmodelsinLS-DYNAthatcanbeutilizedtomodelconcretematerial,therequiredinputparametersmaynotbereadilyavailabletotheuser.Inthispaper,threematerialmodelswithsimpleordefaultparamet

7、ergenerationarepresentedwithoutperformingcalibrationexercise.Theideaforthisapproachistohelptheanalystperformpreliminaryevaluationofthestructuralintegritywithminimum3-9th®SimulationTechnology(1)10InternationalLS-DYNAUsersConferenceinformation(e.g.,unconfinedcompressivestrength,aggrega

8、tesize).Asan