FRP约束混凝土柱的受压性能研究

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1、合肥工业大学博士学位论文FRP约束混凝土柱的受压性能研究姓名：胡波申请学位级别：博士专业：工程力学指导教师：王建国20100301ABSTRACTFiberreinforcedpolymer／plastic(FRP)compositematerialshavebeenwidelyusedforstructuralrehabilitationandstrengthening,especiallyintheaspectofupgradingconcretecolumns．Asabasicmechanicalper

2、formance，compressivebehaviorofFRP-confinedconcretecolumnsisofcrucialimportance．Inthisthesis，thecompressivebehaviorofthreemajorconcretecolumnsconfinedwithFRPiSinvestigatedindetail，whichincludesbehavior‘ofFRP·confinedconcretecolumnsunderaxialcompression,behav

3、iorofFRP-confinedreinforcedconcrete(RC)columnsundereccentriccompressionandbehaviorofFRP-concrete·-steelhybriddouble··skintubularcolumnsunderaxialcompression．．Themajorcontributionsoftheworkpresentedinthisthesisarelistedasfollows：(1)Aunifiedmodelforstress-str

4、ainrelationshipofcircularandrectangularconcreteconfinedwithH冲underaxialcompressionisproposedbasedontheoreticalanalysisandregressionanalysis．Thetheoreticalcorvesareingoodagreementwiththeexperimentalcurves．Afiniteelementmodel(FEM)forsimulatingthebehaviorofFRP

5、-confinedconcretecolumnsunderaxialcompressionisproposedbasedonselectingdifferentconcreteconstitutivemodelaccordingt0differentconfinementlevelandusinglayeredshelltosimulateFRP．ThenumericalresultsareingOOdagreementwiththeexperimentalresults．(2)Extensivecollec

6、tionandevaluationofexistingstrengthandultimatestrainmodelsforconcretecolumnsconfinedwithFRParepresented．Theresultsshowthatthepredictionforstrengthismoreaccuratethanthepredictionforultimatestrain．Amongtheseexistingmodels，thepredictionofCampione’Sstrengthmode

7、lforcircularspecimenswithstrain-hardeningandrectangularspecimenswithstrain-softeningaremoreaccurate，andthepredictionofDeLorenzis’Sultimatestrainmodelforcircularspecimensaremoreaccurate．BasedonmaintainingtheaccuracyofCampione’SstrengthmodelandDeLorenzis’Sult

8、imatestrainmodelandconsideringtheeffectivenessofconfinementcausedbycross-section，improvedmodelsforpredictingstrengthandultimatestrainareproposed．Thecomparisonwithexperimentalresultsandexistingmodelssho