安庆长江大桥桥上无缝线路设计方案研究

The Research on the Designing Schemes of the Continuously Welded Rails on the Anqing-Changjiang Bridge

安庆长江大桥为大跨度钢桁梁斜拉桥,桥上铺设无缝线路。大跨度斜拉桥结构复杂,为塔-索-梁空间组合体系,铺设无缝线路后,在荷载作用下,会形成"塔-索-梁-轨"耦合作用体系,其无缝线路力学传递机理较一般桥上无缝线路更为复杂。通过建立大跨度斜拉桥"塔-索-梁-轨"耦合模型,对安庆长江大桥桥上无缝线路纵向力进行计算分析,比选大跨度钢桁梁斜拉桥上无缝线路多种设计方案,提出可行的无缝线路结构设计方案。

The Anqing-Changjing Bridge is a large-span cable-stayed steel truss bridge,and the continuously welded rails are laid on the bridge.Since,the large-span cable-stayed steel truss bridge has a complex structure,after the continuously welded rails are laid,the load will make the bridge a coupled system of towers,cables,girders,and rails.The mechanism of force transition of the continuously welded rails on such a bridge is more complicated than that on other bridges.By setting a coupled model of towers,cables,girders,and rails for a large-span cable-stayed bridge,this paper calculates and analyzes the longitudinal force of the continuously welded rails on the Anqing-Changjiang Bridge,compares several designing schemes,and proposes a feasible designing scheme for the structure of the continuously welded rails.