大跨度曲面屋盖风压分布特性的试验研究

Wind tunnel investigation of wind pressure distributions on a large-span curved roof

通过某机场航站楼的刚性模型风洞试验研究,得到了上下屋盖表面的平均、脉动风压系数,对其风压分布特性进行了研究。结果表明:上表面屋盖主要呈现负压,在屋盖迎风面边缘出现较大气流分离;下表面屋盖迎风面出现正压,背风面主要为负压,风压系数变化梯度较大,风荷载特性更加复杂。

Based on the wind tunnel test of the rigid model in an airport terminal, this paper presents the test results of the average and fluctuating wind pressure coefficients on up and down the roof surface. The characteristics of the wind pressure distributions was studied in detail. The results show that negative pressures occurred on the upper surface of roof mainly, and comparatively large flow separation occurred on windward side of the edge in the roof. Positive pressures occurred under surface of the windward roof, but negative pressures occurred on the leeward side. Wind pressure coefficient of under surface has very large changes in gradient, and wind load characteristics are thus more complex. Such results can be taken as a reference for the design and construction in the wind-resistant of long-span surface roof.