甬江左线特大桥桥塔施工过程模拟分析.pdf

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1、桥梁建设2014年第44卷第4期(总第227期)BridgeConstruction，Vo1．44，No．4，2014(TotallyNo．227)文章编号：1003—4722(2014)04—0112—05甬江左线特大桥桥塔施工过程模拟分析孙小猛，徐登云，赵飞，闫子才。(1．中铁四局集团博士后工作站，安徽合肥230023；2．中铁四局集团第二工程有限公司，江苏苏州215131；3．中国铁路工程总公司，北京100039)摘要：甬江左线特大桥主桥为主跨468m的双塔双索面钢一混混合梁铁路斜拉桥，桥塔高177．91m，桥面以上采用倒Y形，桥面以下内缩为钻石形。桥塔采用全自动液压爬模施

2、工，下横梁采用支架现浇法施工，在工序上采用“先塔后梁”的异步施工技术。为控制桥塔施X-过程应力和变形，确保施工过程安全、可靠，采用MIDASCivil2010软件建立桥塔有限元模型，对桥塔施工全过程进行模拟分析。结果表明：在桥塔施工过程中，下塔柱和中塔柱根部应力均满足施工要求；桥塔最大横向累计位移24mm，最大竖向累计位移29．7mm，说明主动横撑有效改善了塔身应力和线形。实际施工中桥塔横向位移偏差控制在2cm范围内。关键词：铁路桥；斜拉桥；桥塔；异步施工；施工过程；有限元法；应力分析中图分类号：U448．27文献标志码：ASimulationAnalysisofConstruc

3、tionProcessofPylonsofYongjiangRiverLeftLineBridgeSUNXiao—meng，XUDeng—yun。，ZHAOFei，YANZi—cai。(1．Post—DoctoralWorkingStation，ChinaRailwaySijuCivilEngineeringGroupCo．，Ltd．，Hefei230023，China；2．TheSecondEngineeringCo．，Ltd．，ChinaRailwaySijuCivilEngineeringGroup，Suzhou215131，China；3．ChinaRailwayGrou

4、pLimited，Beijing100039，China)Abstract：ThemainbridgeoftheYongjiangRiverLeftLineBridgeisarailwaysteelandcon—cretehybridgirdercable—stayedbridgewithdoublepylons，doublecableplanesandwithamainspanof468m．Theheightofthepylonsofthebridgeis177．91m，thepartsofthepylonsabovethedeckareintheinvertedY—shape

5、andthepartsbelowthedeckareinwardlydrawnbackintothediamondshape．Thepyloncolumnswereconstructedbytheautomatichydraulicclimbingformwork，thepylonlowercrossbeamswereconstructedonscaffoldingsbythecast—in—situmethodandfortheworkingproceduresoftheconstruction，theasynchronousconstructiontech—niqueofco

6、nstructingthepyloncolumnsfirstandthecrossbeamslatewasused．Tocontrolthestressanddeformationofthepylonsintheconstructionprocessandtoensuretheconstructiontobesafeandreliable。thesoftwareMIDASCivil2Ol0wasusedtoestablishthefiniteelementmod—elforthepylonsandthesimulationanalysisofthewholeconstructio

7、nprocessofthepylonswascarriedout．Theresultsoftheanalysisindicatethatintheconstruction．thestressofboththelowerandmiddlepyloncolumnfootingscansatisfytheconstructionrequirements，themaximumaccumulativetransversedisplacementofthepylonsiS24mmandthe