作　　者： ; ; ; ;

机构地区： 西北电力设计院

出　　处： 《电力建设》 2012年第12期62-66,共5页

摘　　要： 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。 Wind vibration coefficient is one of the key factors for wind-resistant design of cooling towers.At present,the wind vibration coefficients suggested in cooling tower design codes in China are only associated with terrain roughness,while the closely related effect of structure dynamic characteristics are ignored.Taking the three different hyperbolic cooling towers with similar shape ratio but different heights as examples,the values and distributions of wind vibration coefficient are investigated in this paper,by using the calculation method of wind-induced responses that considered background,resonance and their cross-term.The results show that the height of cooling tower has obvious influence on the wind-induced response of its structure,so the conventional method is questionable that adopts the same wind vibration coefficient for cooling towers with different heights.

关 键 词： 双曲线冷却塔 塔高 一致耦合方法 风振系数 风致响应

领　　域： [建筑科学] [建筑科学]