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1、NonlinearAnalysisofAxiallyLoadedConcrete-FilledTubeColumnswithConfinementEffect123Hsuan-TehHu,M.ASCE;Chiung-ShiannHuang;Ming-HsienWu;4andYih-MinWuAbstract:Propermaterialconstitutivemodelsforconcrete-®lledtube~CFT!columnsareproposedandveri®edbythenonlinear®niteelementprogramABAQUS
2、againstexperimentaldata.ThecrosssectionsoftheCFTcolumnsinthenumericalanalysisarecategorizedintothreegroups,i.e.,circularsection,squaresection,andsquaresectionstiffenedbyreinforcingties.Viathenumericalanalyses,itisshownthatforcircularCFTcolumns,thetubescanprovideagoodcon®ningeffe
3、cttotheconcreteespeciallywhenthewidth-to-thicknessratioD/tissmall~sayD/t,40).ForsquareCFTcolumns,thetubesdonotprovidealargecon®ningeffecttotheconcreteespeciallywhenthewidth-to-thicknessratioB/tislarge~sayB/t.30).Thecon®ningeffectofsquareCFTcolumnswithreinforcingtiesisenhancedbyt
4、heuseofreinforcingtiesespeciallywhenthetiespacingissmallandthetienumber~ortiediameter!islarge.DOI:10.1061/~ASCE!0733-9445~2003!129:10~1322!CEDatabasesubjectheadings:Columns;Nonlinearanalysis;Axialloads;Con®nement;Parameters.Introductionterialpropertiessuchasthecompressivestrengt
5、hoftheconcreteConcrete-®lledtube~CFT!columnscanprovideexcellentseismicandtheyieldstrengthofthesteel.Inaddition,theultimateresistantstructuralpropertiessuchashighstrength,highductility,strengthsofCFTcolumnsarealsoin¯uencedbytheconcreteandlargeenergyabsorptioncapacity.Inadditionto
6、theenhance-con®ningpressureandthegeometricpropertiesofthetubessuchmentinstructuralproperties,aconsiderableamountofconstruc-astheshapeofthecrosssection,thewidth-to-thicknessratio,andtiontimecanbereducedduetothepreventionofpermanentthespacingandthediameterofthereinforcingties.form
7、work.Asaresult,variousresearchonCFTcolumnshasbeenTheaimofthisinvestigationistoemploythenonlinear®nitedoneinrecentyears~Furlong1967;KnowlesandPark1969;elementprogramABAQUS~Hibbitt,Karlsson,andSorensenFurlong1974;GeandUsami1992;GeandUsami1994;Boyd,2000!toperformnumericalsimulation
8、sofCFTcolumnssub-Cofer,andMcLean1995;Bradford19
