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1、第33卷第6期公路交通科技Vol．33No．62016年6月JournalofHighwayandTransportationResearchandDevelopmentJun.2016doi:10．3969/j．issn．1002-0268．2016．06．011桥梁加固中沟槽植筋新旧混凝土界面抗剪性能试验研究112姜海波,方鑫,郭文华(1.广东工业大学土木与交通工程学院,广东广州510006;2.广东省公路勘察规划设计院股份有限公司,广东广州510507)摘要:本文针对沟槽植筋新旧混凝土界面抗剪性能进行试验研究。该界面
2、处理方式已在佛开高速多座旧桥加固中采用。以界面处理方式、沟槽尺寸、配筋率作为试验参数,研究了该界面的开裂荷载、抗剪承载力、剪切滑移、剪胀、破坏形态。试验结果表明试件抗剪承载力随沟槽宽度、植筋率的增加而增加,设置沟槽的试件抗剪能力相比凿毛粗糙处理有所提高,试件的延性随植筋率的增加而增加。通过与美国ACI、AASHTOLRFD规范中植筋新旧混凝土界面抗剪承载力公式计算值的对比,认为美国ACI规范可以用于计算沟槽植筋新旧混凝土界面抗剪承载力,并给出了建议取值摩擦系数μ=1．0。关键词:桥梁工程;沟槽植筋;试验研究;新旧混凝土;抗
3、剪性能中图分类号:TU375．102文献标识码:A文章编号:1002-0268(2016)06-0068-08ExperimentalSudyonShearBehaviorofGroovedInterfacebetweenNewlyPouredandExistingConcretewithReinforcementinBridgeRehabilitation112JIANGHai-bo,FANGXin,GUOWen-hua(1.SchoolofCivilandTransportationEngineering,Guangd
4、ongUniversityofTechnology,GuangzhouGuangdong510006,China;2.GuangdongProvincialHighwayPlanningandDesignInstituteCo.,Ltd.,GuangzhouGuangdong510507,China)Abstract:Theshearbehaviorofgroovedinterfacewithreinforcementbetweenexistingconcreteandnewlypouredconcreteisexperi
5、mentallyresearched,whichhasbeenadoptedintherehabilitationprojectofseveraloldbridgesinFoshan-Kaipingexpressway.Takinginterfacetype,groovesizeandreinforcementratioasthetestingparameters,thecrackingload,shearcapacity,shearslippage,sheardilation,andfailuremodesinthesp
6、ecimensoftheinterfaceareinvestigated.Thetestresultshowsthat(1)theshearcapacityofspecimensincreaseswiththeincreasingofthewidthofthegrooveandreinforcementratio;(2)thegroovescutontheconcretesurfacecanimprovetheshearcapacitycomparingwiththeroughenedsurface;(3)theducti
7、lityofspecimensenhanceswiththeincreasingofreinforcementratio.ThetestresultiscomparedwiththecalculatedinterfaceshearstrengthbetweennewlypouredandexistingconcretewithtransversereinforcementbyprovisionsofACIandAASHTOLRFD.ItisthoughtthatTheACIspecificationcanbeusedtoe
8、stimatetheinterfaceshearstrengthbetweennewlypouredandexistingconcrete,andthefrictioncoefficientμissuggestedtobe1．0.Keywords:bridgeengineering;groovedint
