椭圆形高耸结构风荷载特性试验研究

结合武汉天河国际机场三期扩建空管工程塔台刚性模型同步测压风洞试验结果,对椭圆形高耸结构的风荷载特性进行了研究.讨论了典型风向角下不同测点层的平均风压系数和极值风压系数的分布规律;基于测点层的风荷载合力时程,采用快速傅里叶变换的方法,得到了椭圆形高耸结构在90°风向角(最大迎风面)下的三维层风荷载功率谱,并采用经验公式对其进行拟合,拟合效果较好.采用LRC法计算了平均风荷载、背景和共振等效静力风荷载,并将结果与荷载规范建议的惯性风荷载法对比,发现两种方法得到的等效静力风荷载吻合较好.

Experimental Study of the Characteristics of Wind Loads on an Oval-shaped High-rise Structure

Based on the simultaneous pressure measurements of the rigid model of Wuhan Tianhe International Airport Phase III (expansion of ATC tower) Project in a wind tunnel test, the characteristics of the wind loads on the oval-shaped high-rise structure were investigated. This paper discussed the distributions of mean and peak wind pressure coefficients on numerous test points under typical wind directions. Based on the time-histories of wind loads and FFT method, the spectra of 3-D wind loads on the oval-shaped structure were obtained for 90° approaching wind direction (corresponding to the maximum windward area). The power spectra were then fitted by using the empirical formula. The mean, background and resonant equivalent static wind loads were determined by the LRC wind load method. The results were compared with those by the inertia wind loading method. It is found that the equivalent static wind loads by these two methods are in good agreement.