地震作用下早龄期钢筋混凝土粘结特性试验研究

43820134BuildingStructureVol．43No．8Apr．2013*1213100142310005。12h0.45g0.25g0.15g0.06g0.00g、、。。TU375A1002-848X201308-0054-04Experimentalstudyonbondbehaviorofearly-agereinforcedconcreteunderearthquakeactionYangJunjie1DaiMiaoxian21CollegeofCivilEngineeringandArchitectureZhejiangUniversityofTechnologyHangzhou310014China2HangzhouCanalProtectionandDevelopmentConstructionGroupHangzhou310005ChinaAbstractTherelativedeformationbetweenreinforcedbarsandconcretewouldbepresentintheearly-ageconcreteundertheearthquakeactionespeciallywiththereinforcedbarsswingingthechangeofbondbehaviorbetweenreinforcedbarsandconcretewouldhappen．Simulativeexperimentsoftheearly-agereinforcedconcrete12hunderdifferentdegreesofseismicactions0.45g0.25g0.15g0.06gand0.00gwerecarriedout．Themechanismandformationofthegapsinearly-ageconcreteassociatedwithswingingactionsofreinforcedbarsthestress-strainrelationshipalongtheanchoragelengthandthelossofbondstressaftervibrationwereinvestigated．Theresultsshowthatthescaleofgaprelatestotheseismicforceschangesthedistributionofbondstressesandreducestheeffectiveanchoragelength．Keywordsearly-agereinforcedconcreteearthquakeactionbondbehaviorexperimentalstudy*2010C13012。[e-mail]。01-3。。、。2312h。。11.15A～E200mm×200mm×200mmA～E0.45g0.25g0.15g0.06g0.00g12h。E1328d。18mm900mm。。。PVC70mm。1.2A～E28d。30ZY-30。《438．1》GB50152—9245kN。1。20mm172。3130mm。Fi、sfsl-F-珋s-珔τ-珋s。2322.1E112h。。。0.45g0.25g0.15g0.06g5.64.53.41.9cm。4。4500mm。。。。2.2512h28d。。5。2.32.3.1。、。55201351。ii+1τiτi=εsi+1－εsiEsAsπdhi1100～120mm。6hiii+1EsAsd、εsiεsi+1ii+1。612h28d1。。12h0.45g5.6cm0.15g0.45g6c。6d6e0.06g。2.3.2730kN。765438．730kN812h-912h28d-0.06g0.15g。。。3-τ-sτs。珔τsfsl。51τ珔ττ。2珋s=sf+sl/2。-珔τ-珋s-τ-s。-、、、。8、912h28d-5。8、928d-。。。412h1。2。3-。1．J．199730647-51．2．J．201141369-71．3．J．201141375-77．4GB50152—92S．1992．5．D．20043-13．75