Concept of Buckling Restraint of Steel Braces with Fiber Reinforced Polymers.pdf

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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