北大体育馆屋盖的风荷载及周边建筑干扰影响的试验研究

Experimental study on wind load and interference effect of surrounding buildings on Peking University Gymnasium roof

结合北京大学体育馆屋盖结构的风洞模拟试验,分别考虑了有无周边建筑两种情况下的风压分布。以屋盖上的平均风荷载和脉动风荷载为研究对象,对屋盖上的风荷载特性和周边建筑的干扰影响进行了详细的分析。得出的主要结论:上游建筑物的干扰一般会减小屋盖上的平均风压,增大屋盖上的脉动风压,且对迎风前缘的影响比对其他部位的影响大;周边建筑物的布置,也有可能产生"兜风效应"从而显著地增大风压;周边建筑的影响使风压分布更加分散,脉动风荷载对于总的设计风荷载来说不能忽略。

Based on wind tunnel test of Peking University Gymnasium roof, the wind pressure distribution is considered under the condition of with and without surrounding buildings . The mean and fluctuating wind loading are studied . Thecharacteristics of wind loads and interference effect of surrounding buildings are discussed in detail. Several conclusions can be made as follows. Generally, interference effect of surrounding buildings can decrease the mean wind pressure and increase the fluctuating wind pressure, and the effect to the front edge of the windward side of the roof is higher than that to other positions. The wind-catching effect may induce high wind pressure because of the location of the surrounding buildings. The wind pressure distribution would become more and more dispersive owing to the interference effect and the fluctuating wind pressure can＇t be neglected as for the whole wind load.