大跨度单主缆悬索桥体系转换过程受力分析

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1、桥梁建设2014年第44卷第3期(总第226期)104BridgeConstruction，Vo1．44，No．3，2014(TotallyNo．226)文章编号：1003—4722(2014)03—0104—05大跨度单主缆悬索桥体系转换过程受力分析李鸥(中铁大桥局集团桥科院有限公司，湖北武汉430034)摘要：广西柳州市双拥大桥为主跨430m的双塔单主缆地锚式悬索桥，采用主缆架设和主梁顶推同步施工、分批张拉吊索的施工工艺。该桥具有单根主缆体系横向受力效应的特殊性，体系转换技术难度大，为了解单主缆体系在施工中各种状态下结构的力学响

2、应，采用无应力状态法，利用ANSYS软件建立全桥有限元模型，分析体系转换过程中的吊索和主缆内力、主缆线形、桥塔偏位和主梁支反力等参数的变化规律。结果表明：吊索和主缆的安全系数均满足要求；主缆跨中矢高变化幅度达8．852m；桥塔塔顶偏位在±150mm以内，桥塔变形和受力均较为合理。二期恒载施工后，该桥成桥线形、内力状态与设计预期目标吻合较好，各项实测参数均满足设计和规范要求。关键词：悬索桥；单主缆；钢箱梁；钢桥塔；体系转换；有限元法；受力分析；桥梁施工中图分类号：U448．25；U445．4文献标志码：AForceConditionA

3、nalysisofaLongSpanSingleMainCableSuspensionBridgeinProcessofSystemTransformationLJOu(BridgeScienceResearchInstituteLtd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430034，China)Abstract：TheShuangyongBridgeinLiuzhou，Guangxiisagroundanchoredsuspensionbridgewithdoubletow

4、ers，asinglemaincableandwithamainspanof430m．Theconstructiontechnologyforthebridgeisthatthemaincableiserectedandthemaingirderisincrementallylaunchedinthesamestepandthesuspendersarethentensionedinbatches．Thebridgeischarac—teristicoftheparticularityofthetransverseforceeffe

5、ctofthesinglemaincablesystemandthesystemtransformationofthebridgeiStechnicallydifficult．Tounderstandthestructura1mechani—calresponsesofthebridgeinthedifferentstateintheconstruction。theunstressedstatemethodandthesoftwareANSYSwereusedtosetupthefiniteelementmodelforthewho

6、lebridgeandthechanginglawsoftheparametersincludingtheinternalforcesofthesuspendersandthemaincable，thealignmentofthemaincable，theoffsettingofthetowersandthesupportreactionforcesofthemaingirderintheprocessofthesystemtransformationwereanalyzed．Theresultsoftheanalysisshowt

7、hatthesafetycoefficientsofthesuspendersandmaincablecansatisfytherequirements，thechangingamplitudeofthesaggingofthemaincableatthemidspanisupto8．852m，theoffsettingofthetowertopsiSwithin±150mmandthedeformationandforcecondi～tionsofthetowersarerationa1．Aftertheconstructiono

8、fthesecondphasedeadloadiScomple—ted，thealignmentandtheinternalforcestateofthecompletedbridgearewellaccordantwiththean