南盘江特大桥拱圈混凝土斜拉扣挂法施工分析.pdf

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1、ూਃࡹഡ２０１６୍４６ज５௹（ሹ２４０௹）１１６BridgeConstruction，Vol．４６，No．５，２０１６（TotallyNo．２４０）文章编号：１００３－４７２２（２０１６）０５－０１１６－０６南盘江特大桥拱圈混凝土斜拉扣挂法施工分析１，２，３１，２，３林春姣，郑皆连（１．广西大学土木建筑工程学院，广西南宁５３０００４；２．工程防灾与结构安全教育部重点实验室，广西南宁５３０００４；３．广西防灾减灾与工程结构安全重点实验室，广西南宁５３０００４）摘要：云桂铁路南盘江特大桥主桥为主跨４１６m的钢管混凝土劲性骨架拱桥，该桥主拱

2、圈３外包混凝土达２４０６８m，拟采用斜拉扣挂分环连续浇筑法施工，将拱圈混凝土分６环，对称设置３组斜拉扣索。为了掌握拱圈混凝土施工时结构的应力和变形，采用软件MIDASCivil建立主拱圈有限元模型，对施工过程中的斜拉扣索索力、钢管混凝土劲性骨架结构应力及拱顶竖向变形等进行了分析。结果表明：采用３组斜拉扣索可实现南盘江特大桥主拱圈的分环连续浇筑，３组斜拉扣索的最大索力为３５００kN；在斜拉扣挂分环连续浇筑施工过程中，张拉３组扣索后，劲性骨架的钢管及管内混凝土的瞬时应力和永存应力均有效控制在规范要求范围内，且拱顶几乎未发生上挠。关键词：拱

3、桥；钢管混凝土；劲性骨架；拱圈混凝土；斜拉扣挂法；分环连续浇筑；有限元法；受力分析中图分类号：U４４８．２２；U４４５．４文献标志码：AAnalysisofConstructionofMainArchRibConcreteofNanpanRiverBridgeUsingFasteningStayMethod１，２，３１，２，３LINChunjiao，ZHENGJielian‐‐（１．CollegeofCivilEngineeringandArchitecture，GuangxiUniversity，Nanning５３０００４，Chin

4、a；２．KeyLaboratoryofEngineeringDisasterPreventionandStructuralSafetyofMinistryofEducation，GuangxiUniversity，Nanning５３０００４，China；３．KeyLaboratoryofDisasterPreventionandEngineeringStructureSafetyofGuangxi，GuangxiUniversity，Nanning５３０００４，China）Abstract：ThemainbridgeoftheNanp

5、anRiverBridgeonYunnan‐GuangxiRailwayisacon‐crete‐filledsteeltube（CFST）framearchbridgewithamainspanof４１６m．Theconcretethaten‐３casestheCFSTframeofthemainarchribofthebridgeisupto２４０６８mandistobeconstructed，usingthemethodofcontinuouslycastinginringssupportedbythefasteningstay

6、s．Theconcretecastingforthearchribisdividedinto６ringsand３groupsofthefasteningstaysaretobesymmet‐ricallyarranged．Towellunderstandthestressanddeformationofthestructureintheconstructionofthearchribconcrete，thesoftwareMIDASCivilwasusedtobuildupthefiniteelementmodelforthearch

7、rib，thefasteningstayforces，thestructuralstressoftheCFSTframeandtheverticaldeformationofthearchcrownintheconstructionwereanalyzed．Theresultsoftheanalysisindi‐catethatthemaximumforceofthe３groupsofthefasteningstaysis３５００kNandwiththese３groupsofthefasteningstays，thecontinuou

8、slycastingofthemainarchribconcreteofthebridge收稿日期：２０１６－０１－２９基金项目：ܼ༆ሱಖ॓࿐ࠎࣁཛଢ（２０１３GXNSFAA０１９３０６）；ܼ༆ٝᄙࡨᄙა۽ӱνಆᇗൌဒ൩