在斜拉桥结构体系中,总会存在一组索力,使斜拉桥结构体系达到最优效果,有两种结果:一是在恒载作用下某种反映受力性能或用材指标的目标趋于最优;二是在活载作用下主梁受力安全。我们称这组索力为合理索力。对于合理索力,国内外桥梁专家提出了很多理论和计算方法,最常见的几种计算方法有:1、刚性支承连续梁法;2、内力(或应力) In the cable-stayed bridge system, there is always a set of cable forces that make the structural effect of the cable-stayed bridge to achieve the best results. There are two results: First, under the action of dead load, there is a certain target reflecting the force performance or timber index Tends to be the best; the second is live load under the main beam by force safety. We call this group cable force reasonable cable force. For reasonable cable force, bridge experts at home and abroad put forward a lot of theories and calculation methods. The most common calculation methods are as follows: 1. rigid support continuous beam method; 2. internal force (or stress)