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风振系数是冷却塔结构抗风设计的关键参数之一,目前国内冷却塔结构设计规范给出的风振系数仅与地面粗糙度有关,而忽略了与之密切相关的结构自身动力特性的影响。针对3座体型比例相近而塔高不同的双曲线冷却塔,采用考虑背景、共振以及背景和共振分量之间交叉项的风致响应计算方法,分别考察了各自的风振系数数值及其分布特征,对比研究结果表明:冷却塔的塔高对其结构的风致动力响应影响明显,不同高度的冷却塔采用相同风振系数的通常做法值得商榷。
The wind-induced vibration coefficient is one of the key parameters of the wind-resistant design of cooling tower structure. At present, the wind-induced vibration coefficient given by the design code of domestic cooling tower is only related to the roughness of the ground, but ignores the dynamic characteristics of the closely related structure itself . In view of the three hyperbolic cooling towers with similar body shapes and different tower heights, the wind-induced responses of the cross-terms of the background, the resonance and the background and the resonance components are used to investigate the values of the wind-induced vibration coefficients and their distribution characteristics, respectively. The results of the comparative study show that the tower height of the cooling tower has a significant influence on the wind-induced dynamic response of the structure, and the common practice of using the same wind-induced vibration coefficient for different height cooling towers is debatable.