单轴对称L型截面高层建筑脉动风压非高斯特性研究

Study on Non-Gaussian Features of Fluctuating Wind Pressure on L-Shaped Tall Building with Monosymmetric Section

为了对单轴对称L型截面高层建筑表面幕墙开展合理的抗风安全设计,对缩尺刚性模型开展了同步动态测压风洞试验研究。基于试验结果,绘制了典型风向角下模型各立面脉动风压系数的偏度和峰度分布云图,讨论了脉动风压的非高斯特性;用偏度–峰度检验法对脉动风压系数随机变量进行了正态性检验分析,结合偏度和峰度的相关性分析,给出了此类建筑表面脉动风压的非高斯性区域的判别标准;同时,基于广义极值理论对极值风压系数的概率分布进行了有效拟合。

In order to conduct reasonable wind-resistant design on the curtain walls of L-shaped tall building with monosymmetric section, synchronous pressure wind tunnel test was carried out for a rigid model. Based on the test results, skewness and kurtosis distributions of fluctuating wind pressure coefficients on each elevation under typical wind directions were plotted, and the Non-Gassian features of the fluctuating wind pressure coefficients were discussed. The normality test was conducted for the random variables of the fluctuating wind pressure coefficients by the Skew-ness-Kurtosis test method. Combined with the correlation analysis between skewness and kurtosis, the criterion for Non-Gaussian area of the fluctuating wind pressure coefficients on the surface of this kind building was proposed. Finally, the effective fitting was made for the probability dis-tribution of the extreme wind pressure coefficients in terms of an extreme-value estimation me-thod.