碳纖維布加固混凝土三點(diǎn)彎曲梁斷裂性能研究

1、大連理工大學(xué)碩士學(xué)位論文碳纖維布加固混凝土三點(diǎn)彎曲梁斷裂性能研究姓名：謝雷申請學(xué)位級別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：吳智敏20081201碳纖維布加固混凝土三點(diǎn)彎曲梁斷裂l生能研究StudyonTheFracturePerformanceofTheThree—pointBendingConcreteBeamReinforcedwithCFRPCarbonfiberreinforcedpolymerstrengtheningofconcr

2、etestructurestheoreticalandexperimenmlstudiesonconcretebeamsFewresearchhasbeenAbstract(CFRP)hasbeenwidelyusedinrehabilitationandThescholarsinandouthaveconduetedlotsofthecarryingcapacityandstiffnessofCFRPreinforceddoneond

3、uctilityandtoughnessofreinforcedbeamsWiththedevelopmentofstructuralanalysismethodsthestudyonMechanismsoffractureofconcretehasalSObeenwidelytakenseriouslyBasedontheformeranalyticaltheories，effectivefracturetoughnessandKmc

4、urvesofthereinforeedbeamsarestudiedinthisPaperThefollowingworkiscarriedoninthispaperFirstly，ananalyticalsolutionofconcreteeffecfivefracturetoughnessisbeendeductedBasedonfictitiouscrackmodel，thischapterproposesananalytica

5、lsolutiontoealculatetheeffectivefracturetoughnessofthreepointbendingbeamsInthepresentstudy，theshapeofsofteningcurveinthefictitiouscrackissimplifiedtobebilinearByusingtheproposedanalyticalsolutionwhentheelasticmodulusEcan

6、dtheflexuraltensilestrengthfrofthebeamsaremeasured，thecriticaleffectivecracklengthoc，themaximumappliedload尸腑xandtheeffectivefracturetoughnessK：【carlbepredictedwithoutanyexperimentThen，basedonthelinearelasticfracturetheor

7、yandthefictitiouscrackmodel，thecrackextensionfractureperformancesofstandardthreepointbendingreinforcedbeamsareanalyzedexperimentallyandtheoreticallyinthispaperThecrackextensionresistancecurves(KReurves)ofreinforeedbeamsc

8、arlbecalculatedfromP—CMoDcurvesrecordedintheexperimentandacomparisonismadebetweentheKR—curvesofthereinforcedbeamswithdifferentheightsanddifferentratiosofinitialcracktobeamheightTheresultsindicatethattherestillhavethephen

9、omenathatthefractureprocesszonelengthwoulddeceaseintheCPRPreinforcedconcretebeams；theeffectofCFI沖oncrackextensionresistanceis也ekeyfactorinthecrackextensionresistanceperformanceofCFRPconcretecompositestructure；keepthesize

10、ofthereinforcedbeams，changetheratioofinitialcracktobeamheightorkeeptheratioofinitialcracktobeamheight，changethebeams’size，wouldnotinfluencethecrackextensionresistanceperformanceKeyWords：concrete；reinforcedwithCFRP；effect