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时间:2019-05-24
《铁路钢桁梁斜拉桥单悬臂施工方法研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2016年第46卷第1期(总第236期)1OOBridgeConstruction,Vo1.46,No.1,2016(TotallyNo.236)文章编号:1003—4722(2016)01—0100—06铁路钢桁梁斜拉桥单悬臂施工方法研究何旭辉。,刘立亚一,邹云峰,杨贤康。(1.中南大学土木工程学院,湖南长沙410075;2.高速铁路建造技术国家工程实验室,湖南长沙410075)摘要:为分析单悬臂施工方法相对于双悬臂施工方法对铁路钢桁梁斜拉桥施工过程和最终成桥状态的影响,以南广铁路郁江特大桥[(36+96+228+96+36)m双塔双索面钢桁梁斜拉桥]为背帚,基于影响矩阵
2、原理,采用MIDASCivi1有限元软件建立全桥有限元模型,分别对2种施工方法下该桥斜拉索索力和各施工阶段受力状态进行分析,并以索力控制为主进行施工监控。结果表明:2种施工方法下,虽然施工过程中斜拉索索力与各施工阶段受力状态有所差异,但通过调整斜拉索初张力及施工控制,采用单悬臂施工方法可以达到与双悬臂施工同样的目标成桥状态,且塔梁受力状态均能满足要求;该桥最终实测索力与目标索力误差在±5以内。关键词:铁路桥;斜拉桥;钢桁梁,有限元法;单悬臂施工;双悬臂施工;索力;施工控制中图分类号:U448.27;U445.557文献标志码:AStudyofSingle-CantileverCon
3、structionMethodforRailwaySteelTrussGirderCable-StayedBridgesHEXu—hui,。,LIULi—ya’。,ZOUYun—feng,,YANGXian—kang'(1.SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075,China;2.NationalEngineeringLaboratoryforHighSpeedRailwayConstruction,Changsha410075,China)Abstract:Toanalyzetheinfluenc
4、esofthesingle—cantileverconstructionmethodontheCOD—structionprocessandfinalcompletedbridgestateofrailwaysteeltrussgirdercable—stayedbridgesonacomparisonbasisoftheinfluencesofthedouble—cantileverconstructionmethod,theYujiangRiverBridgeasteeltrussgirdercable—stayedbridgewithdoublepylons,doubleca
5、bleplanesandwithspanarrangement(36+96+228+96+36)m]0nNanning—GuangzhouRailwaywastakenasacasestudy.ThesoftwareMIDASCivilwasusedtosetupthefiniteelementmode1forthewholebridgeofthebridgeontheprincipleoftheinfluencematrix,thestaycableforcesandtheforceconditionsofthedifferentconstructionstagesofthebr
6、idgeunderthetwoconstructionmethodswererespectivelycalculatedandanalyzedandtheconstructionmonitoringandcontrolofthebridgewascarriedoutmainlybywayofcontrollingthestaycableforces.Theresultsofthecalculationandanalysisshowthatunderthetwoconstructionmethods,thoughthestaycableforcesintheconstructiona
7、ndtheforceconditionsofthedifferentconstructionstagesaredifferent,theutiliza~tionofthesingle—cantileverconstructionmethodcanmeetthesametargetcompletedbridgestatethatthedouble—cantileverconstructionmethodwillmeetandtheforceconditionsofthe
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