高层建筑风致振动研究的瞬态风压积分法

Integral of Instantaneous Pressure for Studying Wind-Induced Vibration of High-Rise Buildings

提出在风洞试验中通过刚性模型表面瞬态风压的测量和压力积分 ,研究高层建筑脉动风荷载及动态响应的方法。为提高采集速度改进了系统源程序 ,设计了一个复杂体型的高层建筑模型 ,并按高斯求积节点布置测压点。风洞试验中对风剖面、湍流积分尺度及湍流谱作了模拟。检查了数据采集通道间隔对于脉动风压互功率谱的影响 ,并对模型表面分布的脉动风压性质及结构风致动态响应作了讨论 ,说明了本文方法的有效性。

An approach to determine the wind load and wind-induced response of high-rise buildings is presented by use of measuring and integrating of the instantaneous wind pressure distributed on the rigid models surface in wind tunnel tests. The scanning source program of the data acquisition system is updated to promote the sampling rate. A model of high-rise building with complex configuration is designed. The pressure taps are arranged as the nodes of Gauss numerical integration to improve the accuracy. The wind speed profile turbulence integral scale, and turbulence spectrum are simulated in the wind tunnel test. Based on the results of experiments, the influence of the channel interval during data acquisition on the cross-power spectra of fluctuating pressures is examined. The properties of fluctuating wind pressures distributed on the model surface, and the wind induced response of the high-rise building are discussed, which illustrated that the proposed approach is effective and reasonable.