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中文摘要：
基于时域内背景响应、共振响应的定义，提出了背景响应、共振响应的振型能量参与系数，为大跨空间结构风振响应分析过程中主导振型的选取提供了依据。计算分析了国家体育场屋盖结构在340°风向角作用下的风振响应的各个组成部分，有助于理解国家体育场屋盖结构的风振响应特点。由计算结果可知，脉动响应是国家体育场屋盖结构风振响应的主要成分，脉动响应峰值约占控制点位移响应的2／3；平均风响应约占控制点响应的1／3。在脉动响应中，背景响应远大于共振响应。背景响应的振型耦合效应十分明显，应按CQC振型组合方法计算背景响应；共振响应的振型耦合效应可忽略不计。背景响应与共振响应之间的耦合效应可忽略不计。
英文摘要：
The mode energy participation coefficients for background responses and resonant responses are investigated to identify the dominant modes of the Beijing National Stadium. The components of the displacement responses under wind of azimuth 340 degree are analyzed and their characteristics are obtained. The fluctuating component is the main part of the total responses, and the mean wind responses are much less than the fluctuating responses. The background responses prevail against the resonant responses. The background responses of the dominant modes are coupled strongly because of the closely spaced frequencies and the wide-band spectrums. The coupling effect for the resonant responses of the dominant modes can be ignored, because all of the resonant peaks are narrow. The prevailing frequency of wind load is so different from the fundamental frequency of the Beijing National Stadium that the correlation between background response and resonant response is negligible.
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