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1、AxialLoadingBehaviorofCFRPStrengthenedConcrete-FilledSteelTubularStubColumnsZhongTao1,*,Lin-HaiHan2,3andJin-PingZhuang11CollegeofCivilEngineering,FuzhouUniversity,GongyeRoad523,Fuzhou,FujianProvince,350002,People’sRepublicofChina2DepartmentofCivilEngineering,TsinghuaUniversity,Beijing,100084,People’
2、sRepublicofChina3KeyLaboratoryofStructuralEngineeringandVibrationofChinaEducationMinistry,Beijing,100084,People’sRepublicofChina(Received:13August2005;Receivedrevisedform:18April2006;Accepted:2August2006)Abstract:Thispaperpresentstheaxialcompressiontestresultsofconcrete-filledsteeltubular(CFST)stubc
3、olumnsstrengthenedwithcarbonfiberreinforcedpolymer(CFRP)composites.BothcircularandrectangularspecimensweretestedtoinvestigatetheretrofittingeffectsofCFRPcompositesonthem.ThetestresultsshowedthattheCFRPjacketsenhancedtheloadbearingcapacityofthecircularcolumnseffectively,whereastheenhancementwasnotsos
4、ignificantforrectangularcolumns.However,ductilitywasenhancedtosomeextentforthoserectangularcolumns.AsimplemodelisproposedtocalculatetheultimatestrengthofcircularCFSTstubcolumnswrappedwithCFRP.Thepredictedresultsaregenerallyingoodagreementwiththeexperimentalonesobtainedinthisstudyandintheliterature.K
5、eywords:concrete-filledsteeltubes(CFST),hybridcolumns,fiberreinforcedpolymers(FRP),hollowsection,stubcolumn,strengthening,confinement.1.INTRODUCTIONFiberreinforcedpolymer(FRP)compositeshavefoundTheuseofconcrete-filledsteeltubes(CFST)indifferentincreasinglywideapplicationsincivilengineering,areasofco
6、nstructionhasincreasedinrecentyears,characterizedbyhighstrength-to-weightratioandhighespeciallyintallbuildingsandarchbridges(TaoandHancorrosionresistance.Therefore,manyresearcheshave2006).Thecompositecolumnscombinetheadvantagesofbeenundertakenusingthisnewmaterialtoretrofitrein-bothsteelandconcrete.I
7、tprovidesnotonlyanincreaseinforcedconcretestructuresorsteelstructures(HollowaytheloadcarryingcapacitybutalsoeconomyandrapidandLeeming1999;Tengetal.2002;LamandClarkconstruction,andthusadditionalcostsav
