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1、ExperimentalEvaluationofaLarge-ScaleBuckling-RestrainedBracedFrame123LarryA.Fahnestock,P.E.,M.ASCE;JamesM.Ricles,P.E.,M.ASCE;andRichardSause,P.E.,M.ASCEAbstract:Asbuckling-restrainedbracedframesBRBFshavebeenusedincreasinglyintheUnitedStates,theneedforknowledgeabou
2、tBRBFbehaviorhasgrown.Inparticular,large-scaleexperimentalevaluationsofBRBFsarenecessarytodemonstratetheseismicperformanceofthesystem.Althoughtestsofbuckling-restrainedbracesBRBshavedemonstratedtheirabilitytowithstandsigniÞcantductilitydemands,large-scaleBRBFtests
3、haveexhibitedpoorperformanceatstorydriftsbetween0.02and0.025rad.Thesetestsindicatethatthelargestiffnessofthetypicalbeam-column-braceconnectiondetailleadstolargeßexuraldemandsthatcauseundesirablefailuremodes.Aspartofaresearchprogramcomposedofnumericalandexperimentals
4、imulations,alarge-scaleBRBFwithimprovedconnec-tiondetailswastestedattheATLSSCenter,LehighUniversity.Duringmultipleearthquakesimulations,whichwereconductedusingahybridpseudodynamictestingmethod,thetestframesustainedstorydriftsofcloseto0.05radandBRBmaximumductilitydem
5、andsofover25withminimaldamageandnostiffnessorstrengthdegradation.ThetestingprogramdemonstratedthataproperlydetailedBRBFcanwithstandsevereseismicinputandmaintainitsfullload-carryingcapacity.DOI:10.1061/ASCE0733-94452007133:91205CEDatabasesubjectheadings:Steelfr
6、ames;Seismiceffects;Experimentation;Pseudodynamicmethod;Buckling;Bracing;Energydissipation;Connections.IntroductionBlacketal.2002;Usamietal.2003;Merrittetal.2003;Tsaietal.2003b.AsillustratedinTable1,thesetestshavedemon-Astheuseofbuckling-restrainedbracedframesBRBF
7、shasstratedthatBRBsarecapableofwithstandinglargemaximumgrownintheUnitedStatesinthelastfewyears,sohastheneedandcumulativeductilitydemands,whicharedeÞned,respec-forknowledgeaboutBRBFbehavior.Inparticular,large-scaletively,asexperimentalevaluationsofBRBFsarenecessaryt
8、odemonstratetheseismicperformanceofthesystem.Thispaperdescribestestsmaxmax=1thatwereconductedonalarge-scaleBRBFattheATLSSCenter,byLeh
