大跨度悬索桥钢箱梁吊装精细化分析.pdf

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1、大跨度悬索桥钢箱梁吊装精细化分析钟继卫文章编号：1003—4722(2010)06～0009—04大跨度悬索桥钢箱梁吊装精细化分析钟继卫(中铁大桥局集团桥科院有限公司，湖北武汉430034)摘要：钢箱梁吊装是悬索桥施工的一个重要工序，吊装过程中结构的内力和变形变化显著，为保证施工过程安全，以武汉阳逻长江大桥为例，建立考虑索鞍接触、双吊索、梁段连接等实际构造特性的精细化有限元模型，分析钢箱梁吊装过程中结构的变形及钢箱梁吊装过程中主索鞍的顶推工艺。分析可知：钢箱梁底板开口距在吊装前期较大，后期逐渐减小；吊

2、装过程中，钢箱梁线形从明显的凹曲线，逐渐转变为凸曲线并最终达到设计线形；吊装过程中跨缆吊机需设置最小预偏量；同一吊点内、外侧吊索存在的拉力差随着吊装进行不断减小。关键词：悬索桥；武汉阳逻长江大桥；钢箱梁；吊装；线形；有限元法；分析中图分类号：U448．25文献标志码：ARefinedAnalysisofHoistingandInstallationofSteelBoxGirderofLongSpanSuspensionBridgeZHoNGJwei(BridgeScienceResearchInsti

3、tuteLtd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430034，China)Abstract：Thehoistingandinstallationofsteelboxgirderisanimportantprocedureintheconstructionofsuspensionbridgeandinthehoistingandinstallation，thestructuralinternalforceandstructuraldeforma

4、tionofthebridgeoftenexperiencesignificantchanges．Toensurethesafe—tyoftheconstruction，bywayofexampleofWuhanYangluoChangjiangRiverBridge，theau—thorherewithestablishesarefinedfiniteelementmodelthattakesintoaccountofthepracticalstructuralformationcharacteri

5、stics，suchasthecableandsaddlecontact，doublesuspendersandgirderblockconnectionandanalyzesthestructuraldeformationandthetowersaddlepushingpro—ceduresinthehoistingandinstallationofthesteelboxgirder．Itisknownfromtheanalysisthattheopeninggapspacingatthebotto

6、mplatesofthegirderblocksislargeattheearlystageofthehoistingandinstallationandgraduallybecomessmallatthelatestage．Inthehoistingandinstal—lation，thegeometricalignmentofthegirdergraduallychangesfromtheobviousconcavecurvetotheconvexcurveandwillfinallycomeup

7、tothedesignedalignment．Forthecable—supportedcrane，theminimumoffsettingamountisrequiredtObepresetandatthesamehoistingpoint，thetensioningforcedifferencesbetweentheinnersideandoutersidesuspendersshouldbeincessant—lYreducedwiththeproceedingofthehoistingandi

8、nstallation．Keywords：suspensionbridge；WuhanYangluoChangjiangRiverBridge；steelboxgirder；hoistingandinstallation；geometricalignment；finiteelementmethod；analysis收稿日期：2010—06—01作者简介：钟继卫(1975一)，男，高级工程师，1996年毕业于长沙交通学院桥梁工程专业，工学学士，2002年毕