复杂环境下大跨度倾斜平屋面的风洞试验

Wind Tunnel Test of Inclined Long-span Flat Roof in Complex Circumstance

为了研究处于复杂环境下大跨度倾斜平屋面的平均风压及脉动风压的分布特性 ,对一实际工程模型进行了刚性模型测压试验 .试验在模拟的大气边界层风场中进行 ,得到了结构在各个风向角下的风压系数分布 ;通过对试验数据的分析 ,可知随着风向角和周围建筑相对方位的改变 ,屋面风压的分布主要有三种类型 ;此时屋面的风荷载与由《建筑结构荷载规范》得到的风荷载取值是不相同的 .

In order to investigate the distribution characteristics of the mean wind pressure and the fluctuating wind pressure on the inclined long-span flat roof in complex circumstance, an actual construction was employed to measure its pressure by applying a rigidity model. This measurement is carried out in a simulated wind field of the aerosphere boundary. The wind-pressure coefficient distributions of the structure in different wind directions were then obtained. It is concluded by the analysis of experimental data that the pressure distribution changes with wind direction and the buildings around the structure, which mainly exhibits three types, and that the wind load of the roof obtained by the experiment is different from that obtained by the Load Code for the Design of Building Structure.