黄冈公铁两用长江大桥主桥钢梁设计  

Design of Steel Girder of Main Bridge of Huanggang Changjiang River Rail-cum-Road Bridge

作　　者：文坡[1] 杨光武[1] 徐伟[1] 

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《桥梁建设》2014年第3期1-6,共6页Bridge Construction

摘　　要：黄冈公铁两用长江大桥主桥为(81+243+567+243+81)m五跨连续钢桁梁斜拉桥。该桥采用塔墩固结、塔梁分离的结构体系;采用双层钢桁梁结构,上层为双向4车道高速公路,桁宽27.5m,下层为双线铁路,桁宽16m;钢桁梁采用倒梯形斜主桁断面,桁高15.5m,节间长13.5m;主桁为N形桁架,主桁上、下弦杆均采用平行四边形截面,斜杆采用平行四边形截面或斜工字形截面;节点为焊接整体节点,节点位置的杆件均采用等强对拼连接,斜拉索通过内置式钢锚箱锚固在上弦节点内部;公路及铁路桥面系采用板桁结合的正交异性板整体桥面系;在上弦节点位置设置三角形桁架式横向联结系。The main bridge of Huanggang Changjiang River Rail-cum-Road Bridge is a five- span continuous steel truss girder cable-stayed bridge with span arrangement （81＋243 ＋ 567 ＋ 243＋81） m. The bridge is designed as the one of the structural system of rigidly fixed pylons and piers and separated pylons and girder and is arranged into the double-deck steel truss girder struc- ture. The upper deck of the bridge carries bidirectional 4-lane expressways and the truss width of the deck is 27.5 m while the lower deck carries double-track railways and the truss width of the deck is 16 m. The cross section of the steel truss girder is the inverted trapezoidal inclined main truss section having the truss height of 15.5 m and panel length of 13.5 m. The main truss is the N-shape truss, the upper and lower chords of the truss are of the parallelogram sections and the diagonal members are of the parallelogram or the inclined I-shape sections. The panel points are the welded integral panel points and the members at the locations of the points are all spliced with equal strength. The stay cables are anchored in the panel points of the upper chords via the built- in steel anchor boxes. The floor systems of the roadway and railway are the integral orthotropic floor systems of plate and truss composite structures and at the locations of the panel points of plate the upper chords, the lateral bracing systems of triangular trusses are arranged.

关 键 词：铁路公路两用桥 斜拉桥 钢桁梁 焊接整体节点 正交异性板整体桥面系 内置式钢锚箱 结构设计 桥梁设计 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U443.35[交通运输工程—道路与铁道工程]