STUDY ON RESPONSES OF WIND-INDUCED INTERNAL PRESSURE FOR BUILDING WITH INTERNAL PARTITIONING AND OPENINGS WHEN CONSIDERING ROOF FLEXIBILITY
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摘要: 基于合理假定, 推导了迎风面单开孔两空间结构在其屋 盖以动力和准静态两种方式响应时的内压控制方程组. 通过数值算 例, 分析了各种屋盖柔度下由动力模型与准静态模型计算得到的两子空间内压增益函数、内压系数功率谱以及内压系数均方根值. 结果表明: 当屋盖较柔时, 须采用动力模型来计算内压响应, 反之, 可采用简化的准静态模型. 随着屋盖自振频率的增大, “内压-屋盖”系统的三阶共振频率都增大, 前二阶共振频率处的峰值内压响应也随之增大, 但第三阶共振频率处的峰值内压响应却越来越小, 由两模型计算得到的内压系数均方根值均随之增大, 但它们的差值却越来越小.Abstract: The equations governing wind-induced internal pressure responses for a two-compartment building when the roof responds in dynamic and quasi-static manner are derived based on some reasonable assumptions. The gain functions, power spectra and RMS of internal pressures coefficients in both compartments calculated from the dynamic and quasi-static models are analyzed by the numerical example. The results show that the dynamic model must be used to calculate the response of internal pressure when the roof is flexible, otherwise, the simplified quasi-static model can be applied; with increased natural frequency of the roof, all the three resonance frequencies of the "internal pressure-roof" system increase, and the peak internal pressure responses at the first two frequencies also increase, while it decreases at the third resonance frequency. In addition, the RMS internal pressure coefficients obtained from both models also increase, but their difference decreases.
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