modal analysis method 以结构的各阶振型为广义坐标分别求出对应的结构地震反应，然后将对应于各阶振型的结构反应相组合，以确定结构地震内力和变形的方法。又称振型叠加法。
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通过算例分析，研究了近似振型分解法的计算精度；
The precision of the approximate decoupled modal analysis is …
工程中常采用的风激振动的振型分解法与屋盖的振型特性密切相关。
The mode superposition method that was often used in the analysis of wind induced vibration in engineering had great relevance to the mode characteristics of roofs.
本文首先建立了随机时变结构的振型分解法，然后基于随机时变结构的超越率提出了相应的结构随机时变可靠性的计算方法。
In this paper the methods of mode analysis and the random time dependent reliability, based on crossing rate, of random time dependent structures are suggested.
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