大跨径自锚式悬索桥主缆的线形计算及误差分析

针对自锚式悬索桥的主缆线形在施工过程中的变化特性，自编分段悬链线法和抛物线法程序实现了大跨径自锚式悬索桥主缆线形、空缆线形、各节段无应力长度、吊点坐标和索鞍预偏量等几何特征参数的精确计算；结合工程实例，对自编程序与Midas civil软件计算结果进行了比较分析. 结果表明:与有限单元法相比，分段悬链线法计算得到的索鞍预偏量相对误差为11. 3%，抛物线法计算得到的索鞍预偏量相对误差为23%. 在施工中，分段悬链线法和抛物线法计算结果需要反复修正迭代以综合确定主缆线形.

Computation and Error Analysis of Main Cable Configuration of Large-Span Self-Anchored Suspension Bridges

Aimed at the change characteristics of the main cable configuration of self-anchored suspension bridge in construction process， we developed the program of segmental catenary method and parabola method to realize the accuracy computation of geometrical parameters of large-span self-anchored suspension bridges， such as main cable configuration， unloaded cable configuration， stress-free length of individual segments， hoist point coordinates， and pre-bias of cable saddle， etc. The results of the self-developed program and Midas civil software were compared with a project. The relative error of pre-bias of cable saddle is 11. 3% by the segmental catenary method and is 23% by the parable method compared with that by the finite element method. We suggest that the results of segmental catenary method and parabola method should be modified and iterated repeatedly to determine the main configuration synthetically in construction process.