风力下双曲冷却塔壳体的凤振理论及实际应用

A Theoretical Study on Wind-Excited Responses of Hyperbolic Cooling Towers and Its Application

风力作用下双曲冷却塔壳体的破坏事故屡见报导,引起了国内外力学工作的密切注意。本文按照随机振动理论,采用作者推演的折算系数方法,求出了风振力和风振响应。研究分析表明,折算系数主要决定于单一的结构参数,从而使计算变得简单。应用计算表格已经给出,可供实际应用。

Due to the action of strong windgusts, failures of hyperbolic cooling to wers are frequently reported, which fact attracts many researchers on Wind Engineering to study the wind-excited responses of these structures. In this paper, the author proposes a conversion factor technique basing upon the theory of random vibration, such that formulas of equivalent wind loading and wind-excited response of hyperbolic cooling towers may be obtained. Under careful investigation, it is found that the above mentioned conversion factors depend mainly on a single parameter of the tower. This fact turns out that the computation of the wind-excited responses of the cooling tower becomes rather simple. For the purpose of engineering design of the cooling towers against strong wind gust in a convenient way, tables of conversion fators have beeen prepared in this paper.