首先针对大跨径斜拉桥的结构特点,从主梁、主塔、斜拉索和边界条件等方面阐述了斜拉桥有限元动力分析的建模方法;然后以苏通大桥为例,用ANSYS有限元分析软件,对其成桥状态下的结构自振特性进行了分析。计算结果表明,该桥具有较好的抗震性能,但需要通过节段模型风洞试验检验其颤振稳定性。 First of all, aiming at the structural characteristics of long-span cable-stayed bridges, the modeling method of finite element dynamic analysis of cable-stayed bridges is expounded from the aspects of main girder, main tower, stay cables and boundary conditions. Then with Sutong Bridge as an example, ANSYS finite element analysis software, analysis of the natural vibration characteristics of the structure under its bridge state. The calculation results show that the bridge has better seismic performance, but the flutter stability of the bridge needs to be verified by the wind tunnel test of segment model.