施工缝力学特性及对RC柱抗震性能影响分析

43520133BuildingStructureVol．43No．5Mar．2013RC*12112114000452400045。40%。。。TU375A1002-848X201305-0065-06MechanicalpropertiesofconstructionjointandinfluenceonseismicbehaviorofRCcolumnLiYingmin12YuJing1XiaHongliu12ZhengNina11TheCollegeofCivilEngineeringofChongqingUniversityChongqing400045China2KeyLaboratoryofNewTechnologyforConstructionofCitiesinMountainAreaChongqingUniversityMinistryofEducationChongqing400045ChinaAbstractStatictestsandpseudo-statictestswereconductedtoinvestigatethemechanicalpropertiesofconstructionjointofjointedspecimensandintegralcastingspecimens．Testsresultsshowthatconstructionjointhaslittleeffectonthecompressiveforcecharacteristicsandhasgreatinfluenceontensileandshearpropertiesofconcrete．Thetensilestrengthofjointedconcreteisabouthalfoftheparentconcreteanditcouldbeneglectedinthenumericalanalysis．Andthetensileforceofjointisbornmainlybylengthwaysreinforcementspassingthroughthejoint．Inpureshearconditiontheshearingcapacityisabout40percentsofthatwithintegralconcreteintheconstructionjoint．Theshearcapacityofjointedspecimensdependsonthecompressiveforcesandthedowellingactionofthemainreinforcementpassingthroughthejoint．Constructionjointsofreinforcedconcretestructuresmaycausestressconcentrationwhichwillstrictthedamageareainasmallrangeandadversefactorswillbeformedforseismicperformance．Whichkindofspecificsituationisdominantdependsontherelativesizeofnormalstressandshearstressofjointsurface．Keywordsconstructionjointmechanicalpropertystatictestpseudo-statictestseismicbehavior*CSTC2010AB0007。[e-mail]。020081。。。。Waters2。。3、。4。Monks5。。2013。。Isao6。。。López7。。8。、、、、。。3。。OpenSees。。11。、。。、1。1.1、。C30128d。2。2。1/MPa/mm/mm/%∶∶∶42.50.432030～50211∶0.73∶2.76∶0.4321.23a。1000kN±0.005FS±1%。5.066435．RC×10－5/s。3-4。3-。486kN150mm×150mm21.6MPa475.3kN21.2MPa。C3022.8MPa7%。。4-。。16.6kN100mm×100mm1.66MPa7.7kN0.77MPa。46%。8%。。。。176.7kN150mm×150mm3.9MPa70.3kN1.6MPa。41%。2RC。、。。2.1。8Ⅱ51∶2。5。2。、、4。3b。。。-6。。ΔyΔy80%。762013562.2、、。-8。。“＞＜”。“”。7。。8。－80～320mm78020mm。20mm。20mm。。3。。N=Ns+Nc1V=Vs+Vc2NVNsVsNcVc86435．RC。、、。。9a～c。“”“”9d。“”。“”。9。94。。nl。。10OpenSees。10113.0－0.20.5-11。。11ab。。0.11.59620134.0-12。。。。1251。2。。3。40%。。4。。5。1．M．2008．2WATERST．AstudyofthetensilestrengthofconcreteacrossconstructionjointsJ．MagazineofConcreteResearch1954618151-153．3GB50011—2010S．2010．4．J．2006622-25．5MONKSWL．TreatmentofconstructionjointsJ．Concrete19748228-30．6ISAOUYOSHIDANMORISHITAS．EvaluationofmechanicalpropertiesofconstructionjointbetweennewandoldconcreteundercombinedtensileandshearstressesJ．JournaloftheSocietyofMaterialsScience199847173-88．7LPEZ-BTIZO．BehaviorofreinforcedconcreteframestructureswithconstructionjointsunderlateralloadsJ．MagazineofConcreteResearch1998502133-145．8．J．201144S181-86．9．J．20113351-6．7635、17“、、”。2。8。37。4。5、、、、。1、2。。。。07