川藏公路迫龙沟特大桥设计  

Design of Polong Gully Bridge on Sichuan-Tibet Highway

作　　者：田文民[1] 

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710075

出　　处：《桥梁建设》2017年第6期95-100,共6页Bridge Construction

摘　　要：川藏公路迫龙沟特大桥采用半飘浮体系双塔双索面混合梁斜拉桥,跨径组成为(156+430+156)m。从结构受力、施工、养护、经济性等方面综合考虑,该桥主梁采用混合梁方案。中跨为结合梁,由工字形钢主梁和混凝土桥面板组成;边跨为预应力混凝土梁,采用双边肋断面;钢-混结合段采用整体式结构。从桥塔自身高宽比协调的角度出发,并考虑结构受力,桥塔采用改进的菱形混凝土塔,塔柱在桥面以上呈A形,在桥面以下合并成整体。桥塔基础采用群桩基础。全桥共设置68对钢绞线斜拉索。采用MIDAS Civil进行结构整体计算,并采用ANSYS和Abaqus分别对结合梁锚拉板和索塔锚固区进行局部计算,结果表明该桥整体及局部受力均满足规范要求。The Polong Gully Bridge on Sichuan-Tibet Highway is a semi-floating system hybridgirder cable-stayed bridge with double pylons, double cable planes and with span arrangement （156＋ 430 ＋ 156） m. In comprehensive consideration of the structural force conditions, construction,maintenance and economy, the main girder of the bridge is designed into the hybrid girder, ofwhich the part of the girder for the central span is the composite girder that is made up of the Ishapesteel girders topped with the concrete deck slabs while for the side spans is the prestressedconcrete girder that has the cross section of double edge ribs and the joint sections of both the steeland concrete girders are the integral structures. Proceeding from the compatible height-to-widthratios of the pylons themselves and also considering the structural force conditions, the pylons aredesigned as the modified diamond-shape concrete pylons. The columns of a pylon above the decktake the A-shape while under the deck, are made to merge into an integrity. The foundations forthe pylons are the group piles. On the whole bridge, totally 68 pairs of the steel strand stay cablesare arranged. The MIDAS Civil is used to calculate the global structure and the ANSYS andABAQUS are used to respectively calculate local structures of the anchor tensile plates in the compositegirder and the anchorage zones in the pylons. The results of the calculation yield that theglobal and local structures of the bridge can all meet the relevant requirements in the codes.

关 键 词：斜拉桥 混合梁 混凝土桥塔 方案比选 结构设计 结构计算 有限元法 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]