中文摘要：

以苏通大桥为背景，对超大跨径斜拉桥的空气动力学问题进行了研究，着重讨论了超大跨径斜拉桥的动力特性、风荷载、基于气弹模型的颤振导数识别、结构体系以及涡激振动特性等一系列问题。研究结果表明，考虑侧向风荷载作用下斜拉索的非线性效应之后，全桥结构的竖向刚度有折减现象。同时发现Fixed—Fixed体系是解决顺桥向风荷载的有效途径，还提出了基于气弹模型的颤振导数识别方法，并就斜拉桥的涡激振动和雷诺数效应进行了探讨。

英文摘要：

Aerodynamic problems of super long span cable-stayed bridge are inves Bridge. Dynamic properties, wind loading, identification of flutter derivatives based on full aeroelastic bridge model, longitudinal structural system and vortex excited vibration are mainly focused on. Researches show that vertical stiffness will decrease with wind speed if the nonlinearity of deformation of stay cables under later wind loading is considered. It is also found that Fixed-Fixed system is the most suitable for long span cable stayed bridge under longitudinal wind loading. Identification method of flutter derivatives through full aeroelastic bridge model is p In the end, some discussions on vortex excited vibration and Reynolds number effect are introduced.