沪通长江大桥主航道桥受力特征研究  

Study of Mechanical Characteristics of Main Ship Channel Bridge of Hutong Changjiang River Bridge

作　　者：胡所亭[1,2] 郭辉[1,2] 鞠晓臣[1,2] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081 [2]高速铁路轨道技术国家重点实验室,北京100081

出　　处：《桥梁建设》2015年第6期18-23,共6页Bridge Construction

基　　金：中国铁路总公司科技研究开发计划重大课题(2014G004-B)~~

摘　　要：沪通长江大桥主航道桥为主跨1 092m的双塔三索面钢桁梁公铁两用斜拉桥,为验证该桥受力的合理性,分别建立该桥整体、局部精细化有限元模型,对其合理成桥状态、静活载效应、最不利荷载组合下主桁结构受力特征、桥面系受力特征等展开研究。结果表明:列车活载效应按无限长加载较有限长增加约10%,主桁上弦强度和稳定控制区域为辅助跨跨中附近位置,下弦为辅助墩和桥塔位置。中-活载集中力作用下,铁路桥面系应力由大到小依次为顶板、横梁、U肋、纵梁和底板。汽车活载作用下,公路桥面系桥面板与U肋连接焊缝处存在较明显应力集中,但量值不大;比较不同弧形缺口型式的活载应力水平,表明该桥弧形缺口形状设计较合理。The main ship channel bridge of the Hutong Changjiang River Bridge is a rail-cumroad steel truss girder cable-stayed bridge with double pylons,triple cable planes and with a main span of 1 092 m.To verify if the mechanical conditions of the bridge were reasonable,the global and local refined finite element models for the bridge were respectively established and the mechanical characteristics of the main truss structures and floor systems of the bridge under the reasonable completed bridge state,static live load effect and worst load combinations were studied.The results of the study indicate that the loading of the train live load effect according to the infinite length increases by about 10% as compared to the loading according to the finite length.The strength and stability control areas of the upper chords of the main trusses are at the positions nearby the midspans of the auxiliary spans and the control areas of the lower chords are at the positions of the auxiliary piers and pylons.Under the action of the concentrated forces of the China Railway Standard Live Load,the stress of the railway floor system is in the top plate,cross beams,U ribs,stringers and bottom plate in the order of the great stress to the little.Under the action the truck live load,the significant stress concentration exists in the welding seams jointing the deck plates and U ribs of the highway floor system,but the values of the stress concentration are not great.The live load stress levels of the different arc notches are compared,proving that the design of the arc notch shapes of the bridge is rather reasonable.

关 键 词：公路铁路两用桥 斜拉桥 钢桁梁 整体静力效应 合理成桥状态 安全余量 弧形缺口形状 有限元法 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]