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考虑共同作用的桩筏基础-土-框架结构地震响应有限元分析.docx

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考虑共同作用的桩筏基础-土-框架结构地震响应有限元分析 Abstract Inthepresentstudy,afiniteelementanalysiswasconductedtoassesstheseismicresponseofapiled-raftfoundation-soil-framestructureconsideringmutualinteraction.Theresponseofthestructurewasexaminedunderdifferentgroundmotionstoevaluatethestructuralbehaviorandseismicperformanceofthefoundationsystem.Thefindingsofthestudyindicatethattheresponseofthepiled-raftfoundation-soil-framestructureisinfluencedbythesoil-structureinteractionandthefoundationarrangement.Theseismicresponsesofthefoundationaredependentonthegroundmotion,soilproperties,andthestiffnessofthesoilandstructuralcomponents. Introduction Piled-raftfoundationsystemsarecommonlyusedtosupportlargestructuresandinfrastructures,suchasbridges,buildings,andoffshoreplatforms,duetotheirabilitytodistributetheloadandreducethesettlementofthefoundation.Theinteractionbetweenthepiled-raftfoundation,soil,andsuperstructureisimportantforevaluatingtheseismicbehaviorofthefoundationsystem.Thesoil-structureinteraction(SSI)isdefinedastheexchangeofforcesbetweensoilandastructureandcanaffecttheresponseofthestructureduringseismicloading.TheSSIisdependentonseveralfactors,includingthestiffnessanddampingofthesoilandthestiffnessofthestructure. Inthisstudy,afiniteelementanalysiswasusedtoinvestigatetheseismicresponseofapiled-raftfoundation-soil-framestructureconsideringmutualinteraction.TheaimofthisresearchistoevaluatetheimpactofSSIontheseismicperformanceofthefoundationsystemandinvestigatetheeffectsofdifferentearthquakeexcitationsontheresponseofthefoundationsystem. ModelDescription Themodelanalyzedinthisstudyconsistsofapile-raftfoundation,soil,andaframestructure.Thepile-raftfoundationiscomposedofconcretepiles,aconcreteraft,andasteelframe.Thesoillayerliesbeneaththefoundationsystemandisrepresentedbyanisotropic,linearelasticmaterial.Theframestructureisathree-storysteelbuildingthatissupportedbythefoundationsystem. Thefoundationsystemissituatedonanelastichalf-spacesoillayer,withastiffnessof2.3x10^6N/m^3andaPoisson’sratioof0.35