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1、合肥工業(yè)大學(xué)博士學(xué)位論文FRP約束混凝土柱的受壓性能研究姓名：胡波申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：工程力學(xué)指導(dǎo)教師：王建國(guó)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沖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
