基于无应力状态法的钢箱梁斜拉桥成桥目标线形的实现

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1、桥梁建设2012年第42卷第5期(总第215期)BridgeConstruction，Vo1．42，No．5，2012(TotallyNo．215)63文章编号：1003—4722(2012)05—0063—06基于无应力状态法的钢箱梁斜拉桥成桥目标线形的实现吴运宏，岳青。，江涝，王戒躁(1．中铁大桥局武汉桥梁特种技术有限公司，湖北武汉430074；2．中铁大桥勘测设计院集团有限公司，湖北武汉430056)摘要：针对钢箱梁斜拉桥成桥目标线形的实现，以厦漳跨海大桥北汊主桥为例，提出基于无应力状态控制法理论的主梁预拱度取值、制造尺寸确定、预拼装线形计算及悬

2、臂拼装控制方法。该桥为多跨连续半飘浮体系钢箱梁斜拉桥，采用桥梁结构设计系统SCDS2O11建立桥梁有限元模型，求得钢箱梁设计预拱度；钢箱梁制造尺寸确定时考虑竖曲线和设计预拱度及梁体轴向压缩、弯矩转角的影响；以预拼装线形为基础计算得出每节段前、后控制点的坐标值进行预拼装；在钢箱梁悬臂拼装过程中进行线形控制时，考虑安装阶段的计算挠度及成桥状态与设计预拱线形的高程差。事实证明，采用该方法对钢箱梁斜拉桥进行成桥目标线形的控制取得了良好的施工精度。关键词：斜拉桥；钢箱梁；悬臂拼装；目标线形；预拱度；无应力状态法；有限元法中图分类号：U448．27文献标志码：AR

3、ealizationofTargetGeometricShapesofCompletedBridgeofSteelBoxGirderCable‘-StayedBridgeBasedonUnstressedStateMethodUYun—hong，YUEQing，JIANGYong，WANGJie—ZdO(1．WuhanBridgeSpecialTechnologyCo．，Itd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430074，China：2．ChinaRailwayMajorBridgeReco

4、nnaissance&DesignGroupCo．，Ltd．，Wuhan430056，China)Abstract：Inviewofrealizationofthetargetgeometricshapesofthecompletedbridgeofsteelboxgirdercable—stayedbridge，themainbridgeofthenorthbridgeofXiazhangSea—CrossingBridgewascited38anexampleandamethodforthevalueselectionofprecambering，

5、determina—tionofmanufacturingdimensions，calculationofgeometricshapeofpreassemblingandcontrolofcantileverassemblingofthemaingirderofthebridgebasedontheunstressedstatemethodtheorywasproposed．Thecitedbridgeisamulti～spansemi—floatingsystemcontinuoussteelboxgirdercable——stayedbridgea

6、ndthebridgestructuraldesignsoftwareSCDS2011wasusedtosetupthefi—niteelementmodelforthebridgeandtoacquirethedesignedprecamberingoftheboxgirder．Inthedeterminationofthemanufacturingdimensions，theinfluencesoftheverticalcurve，designedprecambering，axialcompressionandmomentrotationangle

7、softhegirderwereconsideredandaccordingtothegeometricshapeofpreassembling，thecoordinatevaluesofthefrontandrearcontrolpointsofeachgirderblockwerecalculatedandtheblockswerethenpreassembled．Thegeometricshapeofthesteelboxgirderwascontrolledintheprocessofcantileverassemblingandatthesa

8、metime，thecalculateddeflectionofthegirderatthea