Abstract: Wind loading on the roof of a large hangar was investigated by wind tunnel simulation. Results show that under certain wind directions a conical vortex or a pair of conical vortex appears above the roof. The strong peak local negative pressure induced by the conical vortex is the main reason for the destruction on the roof and the parapet may reduce the pressure on the roof. The characteristic of time-mean and fluctuating pressure and their relationship were analyzed. The large difference between the value of fluctuating pressure obtained by the tests and that calculated by the code were discussed.

Key words: plane roof, wind loading, wind tunnel simulation, conical vortex

摘要： 通过风洞模拟实验对某大型机库平面屋顶风荷载进行了研究。结果表明，在一定风向角下屋面出现的单个或一对锥形涡流动结构诱导的局部极大负压峰值是导致屋面破坏的主要原因，女儿墙能稍微减小屋面的风压分布。分析了由于锥形涡引起的屋面平均风压和瞬时脉动风压的特点及其相互关系，讨论了实验获得的脉动压力和按规范计算的差别和原因。

关键词: 平面屋面, 风荷载, 风洞模拟, 锥形涡