利用人工模拟脉动风压计算高层建筑横风向风振动力反应时程

Evaluation of time history of wind induced vibration with man-made wind pressure fluctuation in the across wind direction on high rise buildings

根据日本规范中提出的横风向脉动风力谱系数函数,利用人工模拟横风向脉动风压时程的方法,提出了一个矩形平面高层建筑横风向风振反应时程的计算方法.在计算过程由横风向脉动风压谱系数公式模拟了建筑结构横风向脉动风压过程,采用N ewm ark法计算了两幢建筑物顶部的横风向风振反应.计算结果表明:在横风向脉动风压的作用下,结构的风振反应以共振响应为主,非共振响应仅为次要的部分,这与谱分析法得出的结论是一致的,从而说明了计算结果的正确性.这对于正确估算结构的风振反应值,为高层建筑风振控制措施设计提供参考依据具有一定的意义.

A method for evaluating wind induced vibration in the across wind direction on rectangle high rise buildings has been presented in this paper with simulation of the process of wind pressure fluctuation. In the computation approach, the fluctuating pressure in the across wind direction have been simulated according to the fluctuating pressure spectrum density function specified in the Japanese building code. Evaluation work has been done for a 68m building and a 180m building with the Newmark method and the results show that the resonant response take the significant part of the total dynamic response. The conclusion is as same as that obtained by spectrum analysis. The conclusion could be used as a reference for wind vibration control design of high rise buildings.