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ID:5364274
大小:475.62 KB
页数:15页
时间:2017-12-08
《opensees中刚性隔板的模拟方法及其影响》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、ModelingDiaphragmsin2DModelswithLinearandNonlinearElementsVesnaTerzicUCBerkeleyOctober2011Introductiontotheproblem(1)•Floordiaphragmneedtobeaxiallyrigidtoassureproperdistributionofseismicforcestoalllateralforceresistingelements(columnsandwalls)•Common
2、modelingapproachforframestructuresistorepresentthestructuralcomponents(beamsandcolumns)bylineelementslocatedattheoriginalmembercenterlinesandhavingcross-sectionalpropertiesequaltothoseofcomponents•Commonwaytomodeltheeffectofarigiddiaphragmatafloorleve
3、lisbyimposingrigidconstraintsonallnodesofthatfloorlevelandthusenforcingthesamelateraldisplacementsofallnodesatthefloorlevel•Theseconstrainsenforceconditionofzeroaxialstrainonelements(i.e.,elementcenterline)thatarepartofthatfloorlevelIntroductiontothep
4、roblem(2)•Forsectionswheretheneutralaxisdoesnotshiftasaconsequenceofbendinginthebeam,axialstrainsatelement’scenterlinesarezero,andthusrigidconstraintscanbeappliedtomodelarigiddiaphragm(e.g.steelsections,elasticmaterials)•Fornonlinear-beamcolumnelement
5、swithRCfibersectionwheretheneutralaxisshiftsduetobendinginthebeamaxialstrainsatelement’scenterlinesarenolongerzero.Thus,rigidconstraintsthatenforceconditionofzeroaxialstrainonelementswillchangetheresponseoftheframeCasestudy•Theeffectofrigidconstraints
6、onaforce-basedbeam-columnelementwillbedemonstratedonaportalframeconsideringthreedifferenttypesofsections:–Elasticsteelsection–Nonlinearsteelsection–Nonlinearconcretesection•Force-basedbeam-columnelementischosenforthiscasestudyasitisthemostwidelyusedfo
7、rmodelingframeelements.However,allofconclusionsderivedfromthisstudyholdfordisplacement-basedbeam-columnelement.Example:portalframeTwotypesofanalysis:•Pushover(uptodisplacementof5in.)RCsections•TimehistoryanalysisBeamP(180)P(180)ColumnH3424”16”(3)16”16
8、”144”(1)(2)Steelsections12Column:W14x257360”Beam:W24x68Materials•Elasticsteelsection:Elasticmaterial•Nonlinearsteelsection:Steel02material•Nonlinearconcretesection:Concrete01forcoreandcoverandSteel02forreinforcementConcrete01Steel02ElasticStre
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