axial load on steel tube filled concrete.pdf

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1、AxialLoadBehaviorofStiffenedConcrete-FilledSteelColumns12345678C.S.Huang;Y.-K.Yeh;G.-Y.Liu;H.-T.Hu;K.C.Tsai;Y.T.Weng;S.H.Wang;andM.-H.WuAbstract:Thisstudyinvestigatestheaxialloadbehaviorofconcrete-®lledsteeltubular~CFT!columnswiththewidth-to-thicknessratiosbetween40and150,andpr

2、oposesaneffectivestiffeningschemetoimprovethemechanicalpropertiesofsquarecross-sectionalCFTcolumns.Seventeenspecimensweretestedtoexaminetheeffectsofcross-sectionalshapes,width-to-thicknessratios,andstiffeningarrangementsontheultimatestrength,stiffness,andductilityofCFTcolumns.M

3、oreover,nonlinear®niteelementanalysiswasalsoconductedtoinvestigatecross-sectionalaxialstressdistributionattheultimatestrength.Comparingthemeasuredultimatestrengthwithestimatesbyusingsomecurrentspeci®cationssuggestedthatcurrentspeci®cationsmayconsiderablyunderestimatetheultimate

4、strengthofcircularCFTcolumns,particularlyforcolumnswithasmallwidth-to-thicknessratio.Resultsinthisstudydemonstratethattheproposedstiffeningschemecansigni®cantlyenhancetheultimatestrengthandductilityofsquareCFTcolumns.DOI:10.1061/~ASCE!0733-9445~2002!128:9~1222!CEDatabasekeyword

5、s:Tubes;Axialloads;Finiteelementmethod;Stiffening;Steelcolumns.IntroductionAccordingtoZhong'sbook~Zhong1995!,thereviewbyUy~1998!andthereportbyHuangetal.~1998!,numerousresearch-Inmodernstructuralconstructions,concrete-®lledsteeltubularershaveinvestigatedtheaxialloadbehaviorofCFT

6、columns~CFT!columnshavegraduallybecomeacentralelementinstruc-throughlaboratorytestsand®niteelementanalyses~i.e.,Furlongturalsystemslikebuildings,bridgesandsoforth.CFTcolumns1967;GardnerandJocobson1967;KnowlesandPark1969;havebecomesowidespreadowingtotheiraxiallycompressedTomiiet

7、al.1977;Sakinoetal.1985;LinandHuang1989;KwonnaturemakingthemsuperiortoconventionalreinforcedconcreteandSong1998;andSchneider1998!.Thesestudiescon®rmedandsteelstructuralsystemsintermsofstiffness,strength,ductil-thatthebehaviorofCFTcolumnsisheavilyin¯uencedbytheity,andenergyabsor

8、ptioncapacity.Thesteeltubenotonlytakeswidth-to-thickne