拉索滑移问题是拉索结构分析的一个难点。在一般的有限元模型中,拉索端部只能作为模型中的一个节点,当节点两端索力不同时,无法实现拉索的自由滑动,冷冻—升温法就是为了分析这种现象而提出的。本文针对张弦桁架这种拉索结构的特点,利用冷冻—升温法的思路并加以改进,通过迭代计算的方法分析了张弦桁架中拉索自由滑移后对结构的内力、变形带来的影响,同时也讨论了影响迭代计算收敛性的因素。 The cable slip problem is a difficult part of cable structure analysis. In the general finite element model, the end of the cable can only serve as a node in the model. When the cable forces at both ends of the node are different, the free sliding of the cable can not be realized. The freezing-heating method is proposed to analyze this phenomenon of. In this paper, according to the characteristics of truss cable truss structure, this paper uses the idea of ​​freezing - temperature increasing method and improves it. By means of iterative calculation, the effect of internal force and deformation of truss truss after free sliding is analyzed. Influence, but also discussed the factors that affect the convergence of iterative calculations.