各种异形钢管混凝土的单轴应力应变关系uniaxial stress–strain relationship of concrete confined by various shaped steel tubes

《各种异形钢管混凝土的单轴应力应变关系uniaxial stress–strain relationship of concrete confined by various shaped steel tubes》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、EngineeringStructures23(2001)13311347www.elsevier.com/locate/engstructUniaxialstressstrainrelationshipofconcreteconfinedbyvariousshapedsteeltubes*K.A.S.Susantha,HanbinGe,TsutomuUsamiDepartmentofCivilEngineering,NagoyaUniversity,Chikusa-ku,Nagoya464-8603,JapanReceived31May2000;receivedinrevi

2、sedform19December2000;accepted14February2001AbstractAmethodispresentedtopredictthecompletestressstraincurveofconcretesubjectedtotriaxialcompressivestressescausedbyaxialloadpluslateralpressureduetotheconfinementactionincircular,boxandoctagonalshapedconcrete-filledsteeltubes.Availableempirical

3、formulasareadoptedtodeterminethelateralpressureexertedonconcreteincircularconcrete-filledsteelcolumns.Toevaluatethelateralpressureexertedontheconcreteinboxandoctagonalshapedcolumns,FEManalysisisadoptedwiththehelpofaconcretesteelinteractionmodel.Subsequently,anextensiveparametricstudyiscondu

4、ctedtoproposeanempiricalequationforthemaximumaveragelateralpressure,whichdependsonthematerialandgeometricpropertiesofthecolumns.Lateralpressuresocalculatediscorrelatedtoconfinedconcretestrengththroughawellknownempiricalformula.Fordeterminationofthepost-peakstressstrainrelation,availableexpe

5、rimentalresultsareused.Basedonthetestresults,approximatedexpressionstopredicttheslopeofthedescendingbranchandthestrainatsustainedconcretestrengtharederivedfortheconfinedconcreteincolumnshavingeachtypeofsectionalshapes.Thepredictedconcretestrengthandpost-peakbehaviorarefoundtoexhibitgoodagre

6、ementwiththetestresultswithintheacceptedlimits.Theproposedmodelisintendedtobeusedinfiberanalysisinvolvingbeamcolumnelementsinordertoestablishanultimatestatepredictioncriterionforconcrete-filledsteelcolumnsdesignedasearthquakeresistingstructures.Ó2001ElsevierScienceLtd.Allrightsreserved.Keywo

7、rds:Concrete-filledtubes;Confinement;Concretestrength;Ductility;Stressstrainrelation;Fiberanalysis1.Introductionthickness(orradius-to-thickness)ratiosandshapesofthesections.Steelstrength,columnslendernessratioandConcrete-filledsteeltubes(CFT)arebecomingrateofload