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1、SeismicPerformanceofLightlyReinforcedConcreteExteriorBeam-ColumnJointsKimrethMeas1,BingLi1,*andIswandiImran21SchoolofCivilandEnvironmentEngineering,NanyangTechnologicalUniversity,Singapore2FacultyofCivilandEnvironmentalEngineering,InstituteTechnologyBandung,Ind
2、onesia(Received:15August2011;Receivedrevisedform:14February2012;Accepted:20February2012)Abstract:ThispaperpresentstheexperimentalresultsoffourlightlyReinforcedConcrete(RC)exteriorbeam-columnjointswithandwithoutbeamstubsundercyclicloadingwithconstantcolumnaxialf
3、orceappliedatthetopofthecolumn.Theparameterinvestigatedwasthetypeofreinforcementusedinthebeam,i.e.plainanddeformedbars.Testresultsshowedthatwhenthehooksanchoreddowninthecolumnincreasedthetensilestressinthediagonalconcretestrutinthejointcore,thisledtodiagonalcra
4、ckoftheconcreteandadecreaseinthejointshearstrength.TheseismicperformanceoftheexteriorRCjointswithoutbeamstubwasalsoobservedtobemuchimprovedwhenthehooktailofbeamreinforcementswasbentinsidethejointcore.Thestrut-and-tiemodelbasedontherecordedstraininthejointtransv
5、ersereinforcementcouldbeusedtodeterminetheforceflowinthejointcore.Keywords:reinforcedconcrete,beam-columnjoints,seismicperformance.1.INTRODUCTIONanchoragefailuresoftheRCframeelements.ThisUnderseismicloading,theRCbeam-columnjointcoremightbebecausethesizeofthecol
6、umnsframingtheissubjectedtohorizontalandverticalforceswhichareRCbeam-columnjointswasnotlargeenoughandthusmanytimeslargerthanthebeamorcolumnelements.Ifthedowelactioncouldnotbefullydeveloped.Asathejointcoreisnotcarefullydesignedanddetailed,itresult,thejointcoreco
7、uldleadtobondstressmaybecometheweaklinkamongstthestructuraldeterioration.Secondly,themajorityofthereinforcingelements(Lietal.2002,2009).Thiscanhaveabarsusedwereplainbars.ItwascommonpracticeinsignificanteffectontheoverallresponseoftheIndonesiatousecolumnsofsize1
8、00mm×100mmorstructureandcanevenreducetheductilityperformance,150mm×150mmintheconstructionoflow-riseasreportedbyDadiandAgarval(2008).Acommonbuildings.However,thiswasanunsound
