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1、ConfinedConcrete-FilledTubularColumns123YanXiao;WenhuiHe;andKang-kyuChoiAbstract:Thispaperpresentsastudytointroduceandexperimentallyvalidateaninnovativeconcrete®lledsteeltubular~CFT!columnsystem,namedascon®nedCFTorCCFT,forimprovedseismicdesignofsteelandconcretecompositestructu
2、res.Basedonfundamentalmechanics,theconceptisaimedatcontrollingthelocalbucklingofthesteeltubeandcon®ningtheconcreteinthepotentialplastichingeregionsofaCFTcolumn.Toachievethis,severalef®cientdetailsoftransversecon®nementareproposed.Inthe®rstphaseofthestudy,carbon-®ber-reinforce
3、dplasticasadditionalcon®nementofCCFTcolumnswasexaminedthroughexperimentaltesting.Asdemonstratedfromtheresultsofaxialcompressiontestsandseismicloadingtests,thenewtypeofCFTcolumnsystemcanprovideexcellentseismicperformance.Thecomplicatedlocalbucklingandcon®nementmechanismswereex
4、aminedusingaproposedsimpleanalyticalmodel.DOI:10.1061/~ASCE!0733-9445~2005!131:3~488!CEDatabasesubjectheadings:Columns;Buckling;Seismicresponse;Ductility;Con®nement.Introductioncompositeactionbetweenthesteeltubeandconcreteisprimarilyexpectedinthetransversedirectiononlyforatub
5、edcolumn.BackgroundConventionalCFTColumnsTheproposednewconcrete®lledtubular~CFT!columniscon-ceivedbythe®rstwriterbasedonpreviousresearchontwosteelInrecentyears,CFTstructureshavebecomemorewidelyac-tubularcolumnstructuralsystems:theCFTcolumnandthetubedceptedandusedintallbuildin
6、gsaswellasarchbridges,particu-column.ThetwodifferentbutrelatedsystemsareshowninFig.1larlyinthefar-eastregion,likeChinaandJapan.Theadvantagesandarebrie¯ydescribedbelow.ofconventionalCFTcolumnstructuresinclude:1.Asatypicalcompositestructuralsystem,duetothecompos-CFTColumniteeff
7、ects,theadvantagesoftwomaterialscanbeutilizedInaconventionalCFTcolumnsystem,concreteis®lledinsteelandtheirdisadvantagescanbecompensated,thusformingatubes,whichtypicallycontinuethroughoutseveralstoriesorthemorerationalsystem.full-heightofabuilding~e.g.,MoorandGosain1985;Vieste
8、tal.2.Comparedwithsteelstructures,thecostcanbereducedby1997!.Thestee
