基于无应力状态法的悬臂拼装斜拉桥的线形控制

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1、桥梁建设2012年第42卷第3期(总第213期)44BridgeConstruction，Vo1．42，No．3，2012(TotallyNo．213)文章编号：1003—4722(2012)03—0044—06基于无应力状态法的悬臂拼装斜拉桥的线形控制余昆，李景成。(1．中铁大桥局集团武汉桥科院有限公司，湖北武汉430034；2．桥梁结构安全与健康湖北省重点实验室，湖北武汉430034；3．中交第二公路勘察设计研究院，湖北武汉430056)摘要：针对悬臂拼装斜拉桥的线形控制问题，以穗盐路斜拉桥为背景

2、，提出基于无应力状态法理论以钢箱梁制造线形为目标，进行主梁线形控制的方法。该桥为对称独塔双索面塔梁固结体系，采用MIDASCivil建立桥梁有限元模型，分析钢箱梁在不同施工临时荷载作用下的制造线形和安装线形。分析结果表明，该桥安装线形随施工临时荷载的不同而改变，制造线形是结构的稳定量，只要保证梁段的无应力状态量一定，则无应力线形是惟一的；实桥安装时按制造线形夹角进行安装，无论施工过程如何改变，最终成桥阶段的内力和位移与理想目标状态一致。关键词：斜拉桥；钢箱梁；悬臂拼装；线形控制；无应力状态法；有限元法

3、中图分类号：U448．27；U445．4文献标志码：AGeometricShapeControlofCantileverAssembledCable-StayedBridgeBasedonUnstressedStateMethodYUKun～．LIJing—cheng。(1．BridgeScienceResearchInstituteLtd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430034，China；2．KeyLaboratoryofBridg

4、eStructureSafetyandHealthofHubeiProvince，Wuhan430034，China；3．CCCCSecondHighwayConsultantsCo．，Ltd．，Wuhan430056，China)Abstract：Inviewoftheproblemofgeometricshapecontrolofthecantileverassembledca—ble—stayedbridge，theSuiyanRoadCable—StayedBridgewascitedasan

5、exampleandamethodforthegeometricshapecontrolofmaingirderofthebridgebasedontheunstressedstatemethodthe—oryandtakingthegeometricshapeofmanufacturingofthesteelboxgirderforthemaingirderasthegoalwasproposed．Thebridgeascitedisasingle—pylonanddouble—cable—plan

6、estructuralsys—ternwithrigidfixityofitspylonandgirderandwithsymmetricspanarrangement．TheMIDASCivilwasusedtosetupthefiniteelementmodelforthebridgeandtoanalyzethegeometricshapesofmanufacturingandassemblingofthesteelboxgirderofthebridgeundertheactionofdiff

7、erenttemporaryconstructionloads．Theresultsoftheanalysisrevealthatthegeometricshapeofassemblingofthebridgechangeswiththechangingofthetemporaryconstructionloads．Thegeometricshapeofmanufacturingisthestableamountofthestructureandas1ongastheun—stressedstatea

8、mountoftheblocksofthegirderiskepttoagivenamount，theunstressedgeo—．metricshapewillbetheonly．Atthetimetheactualbridgeisassembled，thebridgeshouldbeas—sembledaccordingtotheincludedanglesofthegeometricshapeofmanufacturingandinspiteoft