大跨空间网格结构风振系数探讨

频域法是大跨空间网格结构风振响应实用计算的首选方法，而大跨空间网格结构是频率密集性结构，现在常规的模态分析法已不适合对大跨空间网格结构进行风振响应分析。我国现在仍是采用高耸或高层结构的荷载规范，只取结构的第一阶频率计算风振系数，按此方法进行大跨空间网格结构的风振分析是很不合理的。本文根据模态对系统应变能的贡献，提出了一种简单、有效的方法来计算大跨空间网格结构的风振系数，并通过算例对所提出的方法进行了验证。

WIND RESPONSES ANALYSIS METHOD OF SPATIAL LATTICE STRUCTURES IN FREQUENCY DOMAIN WITH MODE COMPENSATION

The frequency domain method is the first adopted method for the analysis of wind responses of large span spatial structures. Because the large span spatial structures have dense frequencies, the frequency domain method is never suitable for these structures. In China, the high rise structures load code is used for the large span spatial structures, only the first frequency is taken account for the wind vibration analysis, which is not reasonable. According to the contribution of modes to strain energy of system, this paper presented a simple and efficient method to compute the wind vibration coefficient of large span spatial structures. The effectiveness of the proposed method is verified by a numerical analysis of the wind responses of a spherical dome.