中文摘要：

以国家体育场大跨屋盖结构风振响应的计算分析为研究对象，提出了在时域内计算振型能量参与系数的方法，并采用振型能量累积参与系数选择主导振型；提出了利用主导振型响应的协方差计算结构节点的方差响应以及峰值因子的方法。计算结果表明，基于振型时程积分法的风振响应计算方法及响应统计分析方法既显著提高了计算效率又保证了计算结果的精度。

英文摘要：

The mode energy participation coefficient in time domain is presented in this paper. The dominant modes of Beijing National Stadium （abbr. BJNS） are identified by the energy participation coefficients and the cumulative coefficients. Then the wind-induced responses of the dominant modes of BJNS are analyzed by time history analysis method. The covariance matrix of dynamic responses for the dominant modes is calculated, and then the displacement variances and peak factors of the structural nodes are determined. The mode-based time history analysis method presented in this paper improves the calculation efficiency and guarantees the precision of the calculated results.