半月拱形大跨度屋盖的风荷载干扰效应研究

Study of Wind Load Disturbance Effect of Half-Arch Large Span Roof

以某半月拱形大跨度屋盖体育场为背景,采用刚性模型的风洞试验和上、下表面同时测压技术,对该体育场屋盖上、下表面的风荷载进行了研究。通过在屋盖上、下表面布置测点,获得不同风向角时屋盖上、下表面各测点的风压系数。对比分析了在有、无上游建筑物遮挡时屋盖表面的综合风压,以及上游建筑物对该体育场屋盖上、下表面风压的影响。研究结果表明:体育场屋盖的风荷载主要以向上的风吸力为主,屋盖迎风支座处正压较大,最大风压系数达1.4,悬挑处负压较大,最大负风压系数达-2.0。在不同风向角下,上游建筑物对屋盖表面风荷载的干扰效应有所不同,在60°风向角下,干扰效应最为明显。

The wind load on the upper and lower surfaces of the roof of the stadium was studied by using the wind tunnel test of rigid model and the simultaneous pressure measurement of the upper and lower surfaces with a half-moon arched long span roof stadium. By arranging the measuring points on the upper and lower surfaces of the roof,the wind pressure coefficients under different wind directions were obtained. The comprehensive wind pressure on the roof surface was analyzed when the upstream building was affected. The influence of the upstream building on the upper and lower surfaces wind pressure of the stadium was also analyzed. The results show that the wind load on the stadium roof is dominated by the upward wind suction. The positive pressure at the roof windward support is larger,and the maximum wind pressure coefficient is 1. 4. The negative pressure at the cantilever is larger with a maximum of-2. 0. The influence of the upstream building on the roof surface under different wind direction angle is different. The disturbance effect is most obvious under the 60°wind direction angle.