大跨径自锚式悬索桥合理成桥状态的确定方法

通过对有限位移理论和解析迭代法的分析,对基本参数进行分析研究,提出了确定自锚式悬索桥合理成桥状态的思路和方法。以主缆为切入点,在确定主缆线形及吊索、加劲梁内力的情况下,最终得到主缆和吊杆的无应力长度及施工结构状态。基于上述理论,以某主跨328 m的自锚式悬索桥为例,进行了详细的分析,给出了主缆无应力长度、鞍座预偏量、成桥阶段加劲梁、吊杆的内力,确定了该桥的合理成桥状态。

Decision method on reasonable design state of self-anchored suspension bridge

In this paper, through the analysis of basic parameters with the limited displacement theory and iteration method, the clue determing the reasonable design state of this special type of suspension bridge is formed ,which regards the cable as the key to the problem. The zero-stress of cable and hanger, as well as the structural behavior in construction state can be obtained through the determination of the cable's configuration and internal force of hanger and girder. Based on the theory in above, detailed analysis of a self-anchored suspension bridge with the main span of 328 m is carried out and the reasonable design state is determined when the data about the zero-stress of cable, the excursion of the saddle, the internal force of the girder and hanger under static load are figured out.