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1、ACISTRUCTURALJOURNALTECHNICALPAPERTitleno.101-S32ConfiningReinforcementforHigh-StrengthConcreteColumnsbyBingLiandR.ParkAcomprehensiveparametricstudyofreinforcedhigh-strengthconcrete(HSC)columnsisundertakentoverifythecurrentACI318andNZS3101codeprovisionsofconfiningreinforcementinthepotentialplastichi
2、ngeregionsofHSCcolumns.Afullrangeofparametersthathavesignificantinfluencesontheavailablestrengthandcurvatureductilityfactorinthepotentialplastichingesofthecolumnsduringcyclicflexureareexamined.Theseincludetheconcretecompressivestrengthfc′,theaxialloadlevelPe/fc′Ag,theyieldstrengthoftransversereinfor
3、cementfyh,thevolumeratioofthetransversereinforcement,thearearatioofthelongitudinalreinforcementtothegrosssectionareaρt,andtheratioofAg/Ac.Previouslyderivedstress-strainrelationshipsforcompressedHSCconfinedbyvariousquantities,yieldstrengths,andarrangementsoftransversereinforcementareusedincyclicmomen
4、t-curvatureanalysesofarangeofreinforcedHSCcolumnstoderivedesignequations.TheproposeddesignequationsareabletodeterminethequantitiesoftransversereinforcementrequiredforthespecifiedcurvatureductilitydemandsofHSCcolumns.Theaccuracyoftheproposeddesignequationswascheckedbycomparingwithexperimentaldatarepo
5、rtedinpreviousliterature,andasatisfactorycorrelationwasfound.Fig.1—Relationofstrengthofmaterialandfieldsofresearchanddevelopment.Keywords:column;ductility;high-strengthconcrete;reinforcedconcrete;reinforcement;steel.columnsbyLi,Park,andTanaka3haveconfirmedthatsatis-factoryductilebehaviorisnotachieve
6、dintheplastichingeINTRODUCTIONregionsofHSCcolumnunitswithconfiningreinforcementTheincreasinguseofhigh-strengthconcrete(HSC)indesignedaccordingtotheNZS31011andACI318.2ThereconstructioninNorthAmerica,Japan,andAustraliahasarestillmanyregionssuchasB,C,D,E,andF,showninFig.1beenduetoanumberofbeneficialout
7、comesfromitsuseinthatareworthyofmuchfurtherresearch,forthecurrentcodetoreinforcedconcretebuildingstructures.Oneobvioususeofbemodifiedsoastobeapplicabletoallmaterialregions.ItistoHSCisinthecolumnsoftal
