网壳风振响应主要贡献模态的识别及模态相关性影响分析

网壳结构具有模态分布密集的特点，在风振计算中，通常需要考虑多个模态的贡献，甚至需要考虑模态至相关的影响。因此，对网壳风振响应主要贡献模态的识别及相关性影响分析研究显得必要。文中提出，依据归一化模态广义位移协方差矩阵来判别网壳风振主要贡献模态以及分析模态相关性影响，是个简明直观的方法。文中还提出了网壳风振模态特性矩阵的概念，该矩阵与归一化模态广义位移协方差矩阵所反映的模态贡献主次关系的性质非常相似，同样可以用于模态分析，但计算量可以大大减小。

MODAL ANALYSIS OFRETICULATED SHELLS FOR WIND VIBRATION

In the analysis of wind vibration,multi_modes and corre_modes need to be considered for the reticulated shell(RS)structures due to the closely spaced natural frequencies.In the paper,an intuitionistic method is proposed for identifying the main modes and evaluating the contribution of modal cross_correlation by use of the normalized modal displacement covariance matrix.Further_more,the concept of modal characteristic matrix is also presented,which can be used to identify the main modes and evaluate the contribution of modal cross_correlation instead of the use of normalized modal displacement covariance matrix.This method is a well_revised approach,as greatly reduces the computation works.characteristicma