Abstract: In order to evaluate the carrying capacity of one flexible suspension bridge, the authors measured its shape under no load and took a static test under traffic load. Non-linear FEM was used to model the behavior of the structure. It was focused on the method to determine the non-strain state of structure using the measured results. The consistenly of simulated results with the test confirms the correctness of themethod. The method, proposed in this paper to determine the non-strain state of structure, can be used to design and analysis large-span cable structures.

Key words: suspension bridge, cable structure, non-strain state, geometry non-linear, FEM

摘要： 为评估某柔性吊桥的承载力,笔者对其进行了空载状态几何形状测量和静载试验,并利用几何非线性有限元法对试验结果进行了数值模拟.着重探讨了利用结构现状参数,确定结构无应力初始状态的方法.有限元法的模拟结果与实测值的吻合证明了该方法的正确性.笔者建立的结构无应力初始状态确定方法,可用于大跨度索结构的有限元分析与设计.

关键词: 吊桥, 索结构, 无应力初始状态, 几何非线性, 有限元法