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1、THESTRUCTURALDESIGNOFTALLANDSPECIALBUILDINGSStruct.DesignTallSpec.Build.18,351–370(2009)Publishedonline19November2007inWileyInterscience(www.interscience.wiley.com).DOI:10.1002/tal.420SEISMICPERFORMANCEOFTUBULARSTRUCTURESWITHBUCKLINGRESTRAINEDBRACES1123JINKOOKIM*,JUNHE
2、EPARK,SUNG-WOOSHINANDKYUNG-WONMIN1DepartmentofArchitecturalEngineering,SungkyunkwanUniversity,Suwon,Korea2DepartmentofArchitecturalEngineering,HangyangUniversity,Ansan,Korea3DepartmentofArchitecturalEngineering,DankookUniversity,Sungnam,KoreaSUMMARYInthisstudy36-and72-
3、storyframedandbracedtubularstructuresweredesignedaccordingtothecurrentdesigncodeandtheirseismicperformanceswereevaluatedbynonlinearstaticanddynamicanalysis.Accordingtotheanalysisresults,thetubularstructuresgenerallyshowedhighearthquake-resistingcapability.Theframedtube
4、structureshowedloweststiffnessandstrengthcomparedwiththeothermodelstructures.Thebracedtubestruc-turesshowedlargerstrengthbutloweroverallductilitycomparedwithframedtubestructures.Whenbuckling-restrainedbraceswereusedinsteadofconventionalbraces,strengthincreasedsignifican
5、tlycomparedwiththeframedtube,andductilitywasenhancedcomparedwithbracedtubestructures.Astheload–displacementrelation-shipestimatedbystaticpushoveranalysisformedthelowerboundofthedynamicanalysisresults,theresponsemodificationfactorsobtainedbasedonthestaticpushovercurvemay
6、safelybeusedforseismicdesign.Copyright©2007JohnWiley&Sons,Ltd.1.INTRODUCTIONTubularstructureshavebeenwidelyusedasanefficientstructuralsystemfortallbuildings.Typicaltubesystemsarecomposedofperimetermoment-resistingframeswhichresistallthelateralloadsandinternalframessuppo
7、rtingonlygravityloads.Thetubularbehaviorallowsconsiderablefreedominarchitecturalplanningoftheinteriorspace.Manysuper-tallbuildings,includingthe110-storySearsTowerandthe100-storyJohnHancockBuildinginChicago,werebuiltusingtubularsystems.Idealizedtubularstructuresbehaveas
8、ahollowtuberespondingpredominantlyinabendingmode.Tubularbehaviorisachievedbyplacingexternalcolumns1·0–3·0mtoasmuchas6
