剪力钉集束式与均布式布置下钢-混组合梁桥受力分析.pdf

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1、第31卷第3期土木工程与管理学报Vol_31No．32014年9月JournalofCivilEngineeringandManagementSep．2014剪力钉集束式与均布式布置下钢一混组合梁桥受力分析刘沐宇，万杰，张强(1．武汉理工大学道路桥梁与结构工程湖北省重点实验室，湖北武汉430070；2．中铁大桥勘测设计院集团有限公司，湖北武汉430050)摘要：本文针对港珠澳大桥6×85m组合连续梁桥开展受力性能分析，采用Beam188梁单元模拟剪力钉、So1．id45实体单元模拟混凝土桥面板、She

2、ll163壳单元模拟钢箱梁，在最不利边跨建立了精细的空间有限元模型(按剪力钉的实际数量建立梁单元)，采用生死单元法模拟港珠澳大桥的实际施工过程，即大节段整体吊装、简支变连续、支点顶升与回落、支点纵向预应力张拉以及二期恒载的全过程。按照剪力钉集束式布置和剪力钉均布式布置两种方式，分别计算了钢一混组合梁桥受力性能和剪力钉的受力状况。计算结果表明：两种布置形式下组合梁挠度、混凝土桥面板和钢梁应力基本相同；组合荷载工况下集束式与均布式布置剪力钉最大纵向剪力分别为64．49kN和67．98kN，最大拉拔力分别为

3、45．44kN和43．67kN，都满足正常使用要求，为钢一}昆组合梁桥剪力钉集束式布置提供分析依据。关键词：组合梁；剪力钉；集束式；均布式中图分类号：U448．216文献标识码：A文章编号：2095-0985(2014)03-0001-06MechanicalAnalysisofaStee1．concreteCompositeGirderBridgeUnderClusterDistributionandUniformDistributionoftheShearStudsUMu．yu。WANJie，ZH

4、ANGQiang(1．HubeiKeyLaboratoryofRoadwayBridge＆StructureEngineering，WuhanUniversityofTechnology，Wuhan430070，China；2．ChinaZhon~ieMajorBridgeReconnaissance&DesignInstituteCoLtd，Wuhan430050，China)Abstract：Thispapercarriesoutmechanicalperformanceanalysisagain

5、stthe6×85mcompositecontinuousbeambridgeoftheHongkong—Zhuhai-MacauBridge．Beam188beamelementisusedtosimulateshearstuds．Solid45solidelementiSusedtosimulateconcretebridgedeck，andShell163shellelementiSusedtosimulatesteelboxgirder．Thefinespatialfiniteelementm

6、odelsareestablishedinthemostunfavorablesidespan．andbeamelementsareestablishedintheelementmodelsaccordingtotheactualnumberoftheshearstuds．LifeanddeathelementmethodiSusedtosimulatetheactualconstructionprocessoftheHongkong—Zhuhai-MacauBridge，thatislargeseg

7、mentintegrallifting，convertingsimply—supportincontinuous，fulcrumlifting—upandfallbacking，fulcrumlongitudinalprestressedtensionandsecondarydeadload．Themechanicalperformanceofthestee1．concretecompositebeambridgeandtheforcestatusofshearstudsarecalculatedac

8、cordingtothetwokindsofarrangementofclusterdistributionandunifotindistilbutionofshearstuds．Theresultsshowthat：thedeflectionofcompositebeam，thestressofconcretebridgeandsteelboxgirderarebasicallythesame；underthecombinedloadcondition