超大型冷却塔随机风振响应分析

Stochastic wind-induced dynamic response analysis of large hyperbolic cooling tower

针对某超大冷却塔（250m高），通过虚拟激励法对钢筋混凝土双曲冷却塔在风载作用下的随机动力响应进行了分析，获得了风振响应的分布规律，并计算了位移风振系数．分析表明冷却塔前100阶振型频率集中在0．5～2．5Hz，均以环向谐波振动的模态形式出现．低阶振型的模态响应对结构位移风振响应的贡献最大；平均位移在喉部附近O。迎风角位置达到最大值．超大型冷却塔的位移风振系数在塔中间部分较小，底部和顶部较大．

In this paper, the stochastic win＆induced dynamic response analysis of a large hyperbolic cooling-tower（250 me- ters higher） is conducted on the basis of the secondary development of the Pseudo Excitation Method（PEM）, receiving a distribution of wind-induced response and calculating the modal and the displacement wind vibration coefficient of the cool- ing tower. The results show that the bottom and throat of tower are the higher parts of displacement wind vibration coef- ficient, which should be in focus.