The bridge structures are sensitive to wind, the dynamic response of wind-induced vibration will be the factors of restricting the rigidity and intensity and stability.

桥梁结构对风的作用更加敏感，动力反应更加突出，结构的风致振动不足往往就成为制约结构刚度、强度和稳定性设计的因素。

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Vortex-induced vibration is limited amplitude response, but it occurs at low wind speed with relative large amplitude, which will affect the strength and fatigue resistance of the structure.

尽管涡振是一种限幅振动，但由于其发生风速较低，振幅相对较大，会影响结构的强度和疲劳，因此大跨度拱桥的涡振响应研究具有重要的意义。

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The results show that the method is effective to study the wind-induced response and ESWL of large span roofs, by taking into account of multi-mode vibration of the structures.

结果表明本文方法能够有效地分析大跨度屋盖结构的风振响应和等效静力风荷载，能够解决大跨度屋盖结构中多振型参与振动这一主要问题。

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