带竖向接缝的混凝土箱梁桥抗剪性能试验研究.pdf

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1、桥梁建设２０１７年第４７卷第４期（总第２４５期）６６BridgeConstruction，Vol．４７，No．４，２０１７（TotallyNo．２４５）文章编号：１００３－４７２２（２０１７）０４－００６６－０６带竖向接缝的混凝土箱梁桥抗剪性能试验研究１，２１１１１张涟英，袁明，颜东煌，罗媛，岳新华（１．长沙理工大学土木与建筑学院，湖南长沙４１０１１４；２．贵州大学，贵州贵阳５５００２５）摘要：为了解竖向接缝对预应力混凝土箱梁桥抗剪性能的不利影响及改进措施，以七里坪湘江大桥预应力混凝土梁为原型，设计制作４片预应力混凝土模型梁进行跨中单点加载试验，分析各模型梁在

2、试验过程中的裂缝发展情况、破坏形态和抗剪承载力，研究交界面粗糙度和普通钢筋配筋率对抗剪性能的影响。结果表明：各模型梁的裂缝发展过程基本相似，破坏形态均为弯剪破坏；带竖向接缝梁的抗裂性能比整体浇筑梁差，但各梁的抗剪承载力相差不大；带竖向接缝梁的刚度低于整体浇筑梁的刚度；增加接缝处混凝土交界面粗糙度和普通钢筋配筋率可以提高带竖向接缝梁的抗裂性能和刚度。关键词：预应力混凝土桥；箱形梁；竖向接缝；抗剪承载力；刚度；配筋率；模型试验中图分类号：U４４１．４；U４４８．２１５文献标志码：AExperimentalInvestigationofShearBehaviorof

3、PCBoxGirderwithVerticalJoints１，２１１１１ZHANGLianying，YUANMing，YAN‐Donghuang，LUOYuan，YUEXi‐nhua（１．SchoolofCivilEngineeringandArchitecture，ChangshaUniversityofScienceandTechnology，Changsha４１０１１４，China；２．GuizhouUniversity，Guiyang５５００２５，China）Abstract：Toinvestigatetheadverseinfluencesofthe

4、verticaljointsontheshearbehaviorofprestressedconcrete（PC）boxgirderandtherelatedimprovementmeasuresagainsttheinfluences，thePCboxgirderoftheQilipingXiangjiangRiverBridgewastakenastheprototype，４modelPCboxbeamsweredesigned，preparedandthetestsofthesinglepointloadingatthemidspansofthebeam

5、sweremade．Thecrackpropagation，failuremodesandshearbearingcapacityofthemodelbeamsinthetestswereanalyzedandtheinfluencesoftheconcreteinterfaceroughnessandthecommonreinforcementratiosontheshearbehaviorofthebeamswerestudied．Theresultsshowthatthecrackpropagationprocessesofthevariousmodel

6、beamsarebasicallysimilarandthefailuremodesareallthebendingshearfailure．Thecrackingbehaviorofthebeamswiththeverticaljointsispoorerthanthatofthemonolithicallycastbeams，buttheshearbearingcapacityofthebeamsdoesnotdiffergreatly．Therigidityofthebeamswiththeverticaljointsislowerthanthatoft

7、hemonolithicallycastbeamsandtheincreaseoftheconcreteinterfaceroughnessandthecommonre‐inforcementratiosattheverticaljointscanimprovethecrackingbehaviorandrigidityofthebeamswiththeverticaljoints．Keywords：prestressedconcretebridge；boxgirder；verticaljoint；shearbearingcapacity；ri‐gidity；

8、reinforcementratio；