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1、SeismicResponseandPerformanceofBuckling-RestrainedBracedFrames123LarryA.Fahnestock,P.E.,M.ASCE;RichardSause,P.E.,M.ASCE;andJamesM.Ricles,P.E.,M.ASCEAbstract:Astheuseofbuckling-restrainedbracedframesBRBFshasincreasedintheUnitedStates,theneedhasgrownforknowledgeaboutmemberandsystembehav
2、iorunderseismicloadsandforimplementingthisknowledgeintodesignprovisions.Inparticular,methodsfordesigningBRBFsandpredictingseismicresponserequirevalidation.Toaddressthisneed,alongwiththeneedforexperimentsdemonstratingsystem-levelBRBFperformance,aresearchprogramcomposedofnumericalandlarge
3、-scaleexperimentalsimulationswasinitiatedattheATLSSCenter,LehighUniversity.Thispaperdescribesthenonlineardynamicanalysesthatwereconductedaspartofthisresearchprogram.NumericalsimulationsofBRBFresponsewereconductedusinggroundmotionrecordsscaledtotwoseismichazardlevels.Theperformanceofthep
4、rototypeBRBFwasacceptableandperformanceobjectivesweremetintermsofstructuraldamage.Itisshownthatthecurrentlyaccepteddeflectionamplificationfactorunderestimatesmeaninelasticlateraldisplace-mentsunderdesign-levelearthquakesandthesystemoverstrengthfactormaybeunconservative.Thecurrentmethodfor
5、predictingBRBmaximumductilitydemandsisalsoshowntobeunconservativeandamorerigorousmethodforpredictingBRBmaximumductilitydemandsisprovided.DOI:10.1061/ASCE0733-94452007133:91195CEDatabasesubjectheadings:Steelframes;Dynamicanalysis;Buckling;Bracing;Energydissipation;Designstandards;B
6、uildingcodes;Seismiceffects.Introductionetal.2003a.Thus,despitetheformalizationofBRBFdesignguidelines,additionalinvestigationofBRBFsisrequired.InBuckling-restrainedbracesBRBsyieldintensionandcompres-addition,methodsfordesigningBRBFsandpredictingseismicsion,exhibitstableandpredictable
7、hystereticbehavior,provideresponserequirevalidation.Toaddresstheseneeds,aresearchsignificantenergydissipationcapacityandductility,andareanprogramcomposedofnumericalandlarge-scaleexperimentalattractivealternativetoconventionalsteelbraces.Fig.1illustratessimulationswasinitiatedatt
