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1、MechanicsColumnsComposedofStructuralSteelandConcrete-filledSteelTube，2000，138(7):2422-2421CRREL,LymeRoadIndianInstituteofTechnologyBombay,MaterialsResearchEngineerDepartmentofCivilEngineeringinIndiaAbstract:Anewtypeofcompositecolumn,i.e.structuralsteelandconcrete-filledsteeltube(SCFT),wasprop
2、osed.Inthecompositecolumn,structuralsteelwasembeddedinconcrete-filledsteeltube(CFT).Themechanicsofthecompositecolumnswereanalyzed,includingstresses,strainsofconcrete,steeltubeandstructuralsteel,andbucklingofsteeltube.Theresultsshowthatthecolumnhashigherbearingcapacityandexcellentductility.The
3、ultimatebearingcapacityandductilityofthecolumndecreasewiththeincreaseofslendernessratio.Thestrengthofconcretedependsonextremelythethicknessofsteeltubeandsizesofstructuralsteel.Thedistributionofstrengthofconcretevarieswithpositionincrosssectionevenatthesameload.Basedonaboveanalysis,formulasfor
4、predictingthestrengthofconcreteandultimatebearingcapacityofthecompositecolumnsaresuggested.Keywords:Confinedconcrete;Strength;StructuralsteelINTRODUCTIONCompositecolumnsconsistingofconcrete-filledtubes(CFTS)havebecomeincreasinglypopularinstructuralapplicationsintheworld,oftenusedinmoment-resi
5、stingframes.Thisismainlyduetotheirexcellentearthquake-resistantpropertiessuchashighstrength,highductilityandlargeenergyabsorptioncapacity.InChina,thiskindofcolumncanoffermanyotheradvantages,forexampletheincreasedspeedofconstruction,positivesafetyaspects,andpossibleuseofsimplestandardizedconne
6、ctions.Furthermore,thesteeltubeenclosestheconcretecoreandisusedasbothlongitudinalandlateralreinforcementaswellasformworkduringcastingoftheconcrete.Forseismicexcitation,thecyclicresponseofCFTSandtheirconnectionsprovidesfullyhystereticloopswithsubstantialenergydissipation.Strengthandstiffnessde
7、gradationdoesoccur,especiallyforCFTSinwhichthe-12-Concretedominatesthebehavior.ExperimentalresearchonCFTS.Beamcolumnsbeenongoingworldwideformanydecades.Thevastmajorityoftheseexperimentshavebeenonmoderate-scalespecimensusingnormalstrengthmater
