沪通长江大桥主航道桥主梁结构设计

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1、桥梁建设2015年第45卷第6期(总第235期)BridgeConstruction，Vo1．45，No．6，2015(TotallyNo．235)47文章编号：1003—4722(2015)06—0047—06沪通长江大桥主航道桥主梁结构设计徐伟，郑清刚，彭振华(中铁大桥勘测设计院集团有限公司，湖北武汉430056)摘要：沪通长江大桥主航道桥为(140+462+l092+462+140)m的公铁两用双塔斜拉桥，采用公路在上、铁路在下的双层桥面布置，主梁为三片主桁钢桁梁结构。主梁上弦公路桥面采用正交异性整体钢桥面板(两侧边跨2

2、52m范围公路桥面采用纵横梁结合混凝土桥面的结构形式)，下弦铁路桥面由与主梁断面同宽的钢箱组成，上、下弦桥面与主桁结合参与整体受力。主桁采用N形桁式，上、下弦杆件均采用板肋加劲箱形截面，腹杆采用箱形或H形截面，主桁节点为全焊接整体节点。在全桥主桁节点处均设有横联。采用桥梁空间分析软件3D—bridge开展结构整体计算并采用ANSYS进行节点应力分析，结果表明结构设计满足规范要求。关键词：公路铁路两用桥；斜拉桥；钢桁梁；全焊结构；正交异性板；结构设计中图分类号：U448．121；U448．27文献标志码：AStructuralD

3、esignofMainGirderofMainShipChannelBridgeofHutongChangjiangRiverBridgexuWei，ZHENGQing—gangPENGZhen-hua(ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo．，Ltd．，Wuhan430056，China)Abstract：ThemainshipchannelbridgeoftheHutongChangjiangRiverBridgeisarail—cumroaddouble—p

4、yloncable—stayedbridgewithspanarrangement(140+462+1092+462+140)m．Thebridgeisarrangedintothedoubledecks，ofwhichtheupperdeckcarriesthehighwayswhilethelowerdeckcarriestherailways．Themaingirderofthebridgeisthesteeltrussgirderstructuremadeupofthreemaintrusses．Thehighwayd

5、eckontheupperchordsofthemaingirderisthein—tegralorthotropicplatesteeldeck(inthe252mrangesofthesidespansonbothsides，thehigh—waydeckisthestructurecompositedbythestringers，crossbeamsandconcretedeckslabs)．Therailwaydeckonthelowerchordsisformedbythesteelboxthathasthesame

6、widthwiththecrosssectionofthemaingirder．Thedecksontheupperand1owerchordsareallcompositedwiththemaintrussesandcontributetotheloadingbearingofthewholestructureofthemaingirder．ThemaintrussesaretheN—shapetrusses，themembersoftheupperandlowerchordsaretheboxsec—tionsstiffe

7、nedbytheplateribsandthewebmembersaretheboxorHshapesections．Thepanelpointsofthemaintrussesaretheall—weldedintegralpanelpointsandatthepanelpointsofthemaintrussesofthewholebridge，thelateralbracingsystemsarearranged．Thewholestructureiscalculated，usingthespatialanalysiss

8、oftware3D—bridgeandthestressofthepanelpointsisana一1yzed，usingthesoftwareANSYS．Theresultsofthecalculationandanalysisdemonstratethatthestruc