Experimental Study on the Damage Evolution of Re-bar

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1、ExperimentalStudyontheDamageEvolutionofRe-barConcreteInterfaceLuXinzhengSCE,THUCSE,NTU1999/2000AbstractAnewtypeofbond-sliptestisdevelopedinthisstudyConstitutiverelationshipofbondisobtainedforthetestFEAusingthisconstitutiverelationshipResultanalysisandcomparingGeneral

2、OverviewIntroductionandLiteratureReviewExperimentProcedureExperimentalDataAnalysisNumericalComputationStudyConclusionandDiscussion1.1IntroductionLiuYu’sConcreteModel(a).(b).(c).(d).RCEDModel(RCElementDamageModel)Damageinthereinforcedconcrete1.Effectivedamageinconcret

3、e2.Slipbetweenconcreteandre-bar3.LocaldamageinconcreteduetoslipRCEDModel(RCElementDamageModel)FLocaldamagexlAffectedzoneLocaldamagezoneinRCEDModelRCEDModel(RCElementDamageModel)ozyx8765432110,129,11ElementinRCEDModel1.2LiteratureReviewBondTestMethod1.Pull-outTest2.Be

4、am-typeTest3.Uniaxial-tensionTestPull-outTestNo-transversebarpull-outtestWithtransversebarpull-outtestPull-outTestSpecimenwithHoopRebarPull-outTestSpecimenwithWebRebarPull-outTestRebarinDifferentplacesFeatureofPull-outTestStrongpoint1.Candeterminetheanchoringstrength

5、ofbond2.EasytoprocedureShortageComplexstressstatearoundthesurfaceBeam-typeTestHalf-beamTesttoSimulatetheInclinedCrackHalf-beamTesttoSimulatetheVerticalCrackBeam-typeTestHalf-beamTesttoSimulatetheInclinedCrackHalf-beamTesttoSimulatetheVerticalCrackBeam-typeTestSimplyS

6、upportedBeamTest1:Lever-typeStrainGauge2:StrainGaugeOntheBottom3:StrainGaugeontheSideFeatureofBeam-typeTestStrongpoint1.Veryclosetotherealstate2.CandeterminebondstrengthofbothanchoringzoneandbetweencracksShortageComplexandExpensiveUniaxial-tensionTestUniaxial-tension

7、TestFeatureofUniaxial-tensionTestStrongpoint1.Candeterminethebondstressbetweencracks2.EasytoProcedureShortageComplexdistributionofbondstress2.ProcedureofTest1.AssumptioninRCEDModela.Puresheardeformationinthebondzoneb.Linearslipfield2.Testpurposea.Determinetheevolutio

8、nofDsb.DeterminetherationalsizeofRCEDelementc.Determinetheparameterofa1,a2TestDeviceandMethodRCSpecimenTestDeviceandMethodLoadingDe