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1、Structures2008:CrossingBorders?2008ASCEConceptofBucklingRestraintofSteelBraceswithFiberReinforcedPolymersAuthors:PeterDusicka,Ph.D.P.E.,AssistantProfessor,PortlandStateUniversity,OregonBenWiley,ResearchAssistant,PortlandStateUniversity,OregonABSTRACTBucklingrestrainedbraceswererecentl
2、ydevelopedforseismicdesignasstiffandductilestructuralmembers.Thesebraceshavetheadvantageofexhibitingsymmetricductilehystereticbehaviorintensionandcompressionmakingthemwellsuitedforresistingreversedorcyclicloading.Thecompressionstrengthofthesemembersisgovernedbymaterialyieldingratherth
3、anglobalbuckling,whichistypicallyachievedbyrestrainingthesteelcorebyencasinginasteeltubefilledwithmortar.Thebucklingrestrainedbracetechnologyhasbeenrapidlyadopted,especiallyinperformancebasedbuildingdesigns,andisnowalsopartoftheAISCSeismicDesignProvisionsasoneoftheductilelateralloadre
4、sistingsystems.Thispaperoutlinesthebucklingrestrainedbraceconceptwiththeuseoffiberreinforcedcompositesandpresentsresultsfromapilotcyclictestonamildsteelanglewrappedwithglassfibercomposite.Eliminatingthesteeltubeandmortarandusingfiberreinforcedcompositessignificantlyreducedthebraceweig
5、htimprovinghandlingduringinstallation.Thismethodcanalsobeusedforretrofitofin-placesteelbraces.Inapilottest,thewrapshiftedthemodeoffailurefromglobalbucklingtohingingneartheconnection,illustratingthepotentialforthisinnovativeconceptwhilealsohighlightingtheimportanceofthebracetransitiona
6、ndconnectiondetails.INTRODUCTIONDiagonallybracedsteelframestructuralsystemsareeffectiveandefficientinresistinglateralloads,althoughtheirseismicperformanceandeffectivedesignisnotwellunderstood.Theabilityofthebracedmemberstoresistlateralmovementinseismiceventsiscomplicatedbythecombinede
7、ffectsoftensileinelasticelongationandcompressioninducedbuckling.Bucklingrestrainedbraces(BRBs)havebeenrecentlydevelopedtocircumventthebucklingcomponentbehaviorwhileretainingtheadvantagesofthediagonallybracedframestructuralsystems.TheconceptbehindtheBRBistoencaseaslendersteelmemberinmo
8、rtari
