大跨度钢-混组合梁桥剪力群钉受力分析研究.pdf

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1、桥梁建设2013年第43卷第3期(总第220期)48BridgeConstruction，Vo1．43，No．3，2013(TotallyNo．220)文章编号：1003—4722(2013)03—0048—06大跨度钢一混组合梁桥剪力群钉受力分析研究赵建，郑舟军(1．武汉桥梁建筑工程监理有限公司，湖北武汉430034；2．中铁大桥局集团桥科院有限公司，湖北武汉430034)摘要：组合梁仿真分析时将多个剪力钉简化成一个等效剪力群钉进行模拟，不能准确得到每个剪力钉的受力情况。为解决此问题，根据实桥集束式剪力钉布置方式制作剪力

2、群钉推出试件，并进行推出试验，得知群钉中最不利的单个剪力钉承担了32～37的总剪力(平均值仅为25)；由大跨度组合箱梁整体模型计算得到剪力群钉受力均值、钢一混凝土相对位移及钢梁与混凝土桥面板的受力状况；根据剪力群钉荷载分配比例对组合梁整体计算得到的剪力钉计算结果进行修正。结果表明，将剪力群钉受力均值换算得到剪力钉受力极值的方法，可实现对大跨度组合梁及其剪力钉的精确仿真分析。关键词：组合梁；剪力钉；钢一混结构；剪力群钉；仿真分析；模型试验；有限元法中图分类号：U448．38文献标志码：AAnalysisandStudyofF

3、orceConditionsofGroupShearStudsofLongSpanSteelandConcreteCompositeGirderBridgeZHAOdian，ZHENGZhou-jnil(1．WuhanBridgeandBuildingWorksSupervisionCo．，Ltd．，Wuhan430034，China；2．BridgeScienceResearchInstituteLtd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430034，China)

4、Abstract：Whenthesimulationanalysisofacompositegirderismade，thewayofsimplifyingthemultipleshearstudsofthegirderintotheequivalentgroupshearstudscannotexactlyacquiretheforceconditionofeachstud．Tosolvetheproblem，thepush—outspecimenofthegroupshearstudswasfabricatedacco

5、rdingtotheclusteringlayoutoftheshearstudsofthepracticalbridge，thepushouttestforthespecimenwascarriedoutanditwasconsequentlyknownthatthesinglestudinthegroupshearstudsundertheworstforceconditionsustained32～37ofthetotalshearforce(whiletheaveragevaluewas25only)．Fromth

6、ecalculationoftheintegralmodelofthelongspancompositeboxgirder，theforceaveragevaluesofthegroupshearstuds，therela—tivedisplacementofthesteelandconcreteandtheforceconditionsofthesteelgirderandconcretedeckslabswereacquiredandwithreferencetotheloaddistributionratiosoft

7、hegroupshearstuds，thecalculationresultsoftheshearstudsweremodified．Theresultsofthecalculationandmodificationdemonstratethatbywayofconvertingfromtheforceaveragevaluesofthegroupshearstudstotheforceultimatevaluesoftheshearstuds，theaccuratesimulationanalysisofthelongs

8、pancompositegirderanditsshearstudscanberealized．Keywords：compositegirder；shearstud；steelandconcretestructure；groupshearstuds；simulationanalysis；modeltes