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中文摘要：
针对大跨度屋盖结构多振型参与振动的特点，提出了一套确定该类结构等效静力风荷载的精细化方法。该方法的流程包括风振响应分析和静力等效两个阶段，每个阶段又分为平均分量、背景分量和共振分量等3个部分分别进行研究。风振响应分析时，背景响应分析采用准静力方法；共振响应分析综合运用本征正交分解法（POD法）和Ritz向量直接叠加法。静力等效时，等效静力风荷载的背景分量采用荷载响应相关系数法分析，其共振分量表示为多个主要参与振型惯性力的组合。基于本文的分析方法，对一鞍形索网结构的风振响应和等效静力风荷载进行了研究，探讨了不同风向下、针对不同响应的等效静力风荷载分布情况。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。
英文摘要：
An elaborate method is developed to analyze equivalent static wind loading （ESWL） of large span roofs, in order to cope with the problem of multi-mode vibration of these structures. The method includes two processes： the wind-induced response analysis and the static equivalent treatment. The wind-induced response and ESWL are both divided into the average, the background and the resonant components. In the process of wind-induced response analysis, background response is calculated with vector method incorporating the Proper Orthogo quasi-static method; resonant response is analyzed with the Ritz nal Decomposition technique. In the process of static equivalent treatment, the background component of ESWL is obtained with the load-response-correlation method; the resonant component is expressed by several inertia loadings of dominating vibration modes. The developed method is employed to analyze wind-induced response and ESWL of a saddle-shaped cable structure. Distributions of ESWL are investigated with different wind directions and structural response types. 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.
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