矩形建筑双幕墙结构风压脉动的非高斯性及峰值因子

Non-Gaussian Features and Peak Factor of Fluctuating Wind Pressures on Double-skin Facades of High-rise Building with Rectangular Shape

借助刚性模型风洞动态同步测压试验,对矩形建筑双幕墙的内幕墙和外幕墙的脉动风压的非高斯统计特性进行了研究。根据测点风压时程及其概率密度分布,并基于测点风压的第三、四阶矩统计量对风压的非高斯特性进行描述,结合峰值因子的取值,给出划分高斯和非高斯区域的标准,在此基础上对矩形建筑双幕墙的内幕墙和外幕墙进行了分区。分析表明:矩形建筑双幕墙的风压脉动为非高斯性的区域主要为内幕墙的拐角分离流区域,而外幕墙由于内外压平衡的原因,其拐角区域的风压脉动特征则基本符合高斯性,在幕墙结构设计时,应提高非高斯区域的风压峰值因子的取值。

The non-Gaussian features of fluctuating wind pressures on the double-skin facades of high-rise building with rectangular shape were systematically studied by using multi-channel measurement wind tunnel tests.Based on the wind pressure sample time series and histograms,the third and fourth order statistical moments of fluctuating wind pressures were employed to obtain a description of the non-Gaussian features.According to the value of peak factor,the criterion of the regions with non-Gaussian features was ...