桥梁建设2023年第53卷第S1期(总第283期)BridgeConstruction,Vol.53,No.SI,2023(TotallyNo.283)98文章编号：1003-4722(2023)Sl-0098-07DOI：10.20051/j.issn.1003-4722.2023.SI.014超宽幅主梁扭背索独塔斜拉桥总体设计张维，付坤，王维民(中交第二公路勘察设计研究院有限公司，湖北武汉430056)摘要：厦漳同城大道沙洲岛特大桥西溪主桥采用(88+200)m扭背索独塔斜拉桥，塔墩梁固结体系。主梁采用钢-混混合梁，其中主跨为整幅钢箱梁，梁宽47m；边跨为预应力混凝土箱梁，梁宽51m；钢-混结合面位于主跨距桥塔理论跨径线15m处。桥塔采用独柱式钢筋混凝土斜塔，总高134.6m,桥塔向边跨倾斜8°,其下布置整体式承台，钻孔桩群桩基础。斜拉索采用标准抗拉强度1670MPa平行钢丝拉索，边跨斜拉索为双索面空间扭背索，主跨斜拉索为准单索面。针对超宽桥面，采用空间梁格法分析剪力滞的影响，将混凝土梁纵腹板由6道增至8道。按3m顺桥向标准间距设置钢箱梁实体式横隔板，可使该桥宽幅主梁偏载、扭转效应导致的应力增量控制在允许范围内。对塔墩梁结合部进行有限元精细化分析，针对应力集中情况，优化局部构造和配筋设计，经计算，优化后结构受力满足设计要求。关键词：独塔斜拉桥;扭背索；超宽幅主梁；钢箱梁；斜塔;塔墩梁结合部；有限元法;桥梁设计中图分类号：U44&27；U442.5文献标志码：AOverallDesignofSinglePylonCable-StayedBridgewithVeryWideMainGirderandTwistedBackCablePlanesZHANGWei,FUKun,WANGWei-min(CCCCSecondHighwayConsultantsCo.,Ltd.,Wuhan430056,China)Abstract:TheXiximainbridgeofShazhouIslandBridgecarryingasectionoftheXiamen-ZhangzhaIntracityAvenueisasinglepyloncable-stayedbridgefeaturingitstwistedbackcableplanes.Thebridgehastwospansof88mand200m,wherethepylonfixedwiththesupportingpierandthesuperstructure・Thesuperstructureconsistsofintegralsteelboxgirdersinthemainspanthatmeasure47mwideandprestressedconcreteboxgirdersinthesidespanwithwidthreachingupto51m.Thesteel-concretejointinterfaceisarrangedinthemainspan,15mtothepylon.Thepylon,rising134.6minfullheight,isamono-polereinforcedconcretepylonthatinclines8°towardsthesidespan.Thepylonismountedonanintegralpilecapthatisinturnsupportedbyboredp辻es.Thestaycablesarecomposedofparallelsteelwireswithnominaltensilestrengthof1670MPa.The...
