中文摘要：

为更准确研究大跨度桥梁的风致振动特性,为设计提供更可靠的方法,对考虑流固耦合作用的大跨度桥梁风振响应进行了研究。介绍了一种流固耦合分析的强耦合方法,同时求解流体控制方程和结构控制方程,计算出全场变量值。给出了与求解方法相应的湍流模型和边界条件。对大跨度悬索桥进行了风振响应分析和颤振分析,与已有文献进行了结果对比。研究表明：发生颤振时,考虑流固耦合作用时桥梁的颤振临界风速要小于不考虑流固耦合作用时的情况,其风振响应要大于不考虑耦合作用的风振响应,说明在气动弹失稳的情况下,流固耦合作用加深了结构的不稳定性。结果表明流固耦合效应对于大跨度悬索桥风振响应有重要影响,强耦合计算方法可以较准确地预测其风致振动特性。

英文摘要：

For more accurately research the wind-induced vibration characteristics and providing more reliable tool in design of long-span bridges, the study is performed on wind-induced vibration responses of long-span bridges considering fluid-solid coupling is performed. A strongly coupling method for analyzing fluid-solid coupling is introduced, the fluid and structural control equations are solved simultaneously to compute the variables of the whole field. The turbulence model and boundary conditions corresponding to the solving method are presented as well. The wind-induced vibration responses and flutter of a long-span suspension bridge are analyzed and the result is compared with those in the previous papers. It is found that （ l ） when flutter occurs, the critical flutter speed considering fluid-solid coupling is less than that without considering fluid-solid coupling, and the wind-induced vibration responses are larger than that without considering fluid- structure interaction, which shows that under aero-elastic unstable condition, fluid-structure interaction enhanced the instability of the structure; （2） fluid-solid coupling poses a great impact on wind-induced vibration responses of long-span suspension bridge, and the wind-induced vibration characteristics could be predicted in a more accurate way by strongly coupling method.