超大边跨连续梁桥设计

介绍重庆市机场专用快速路渝利铁路跨线桥桥跨布设控制因素,阐述该桥采用超大边跨设计的缘由和难点,分析研究结构合龙顺序和体系转换时机.结合具体设计,针对超大边跨设计导致箱梁各跨内力差异较大,预应力钢束配束难度大等问题,简述设计经验,供同行参考.

Design of Extralarge Side-span Continuous Girder Bridges

This paper introduces control factors for laying of spans of Yuli Railway Overpass Bridge on expressway dedicated for the airport of Chongqing,expatiates causes and difficulties of design of extralarge side spans employed by the bridge,and analyzes and studies closure sequence of structures and conversion timing of system.In combination with specific design,and in allusion of problems such as large difference among internal forces of all spans of box girders and large difficulty in matching of prestressed steel tendons,etc.caused by design of extralarge side spans,the paper summarizes design experiences for reference by same industry.