高层建筑屋顶广告牌风压分布特性

通过对广告牌沿高层建筑屋顶单边布置、邻边布置、三边布置及四周布置这4种方式的刚性模型测压试验,测量了广告牌面板表面风压,研究了其分布规律,讨论了面板表面典型测点脉动风压的频域特性.结果表明:来流方向与广告牌面板表面斜交时,不同布置方式的广告牌面板表面平均风压系数及脉动风压系数均比较大,并且面板边缘附近的数值要比面板内部区域大;不同布置方式的广告牌面板表面极值风压系数分布不同,单边布置时出现最大极值风压,而四周布置时极值风压最小;对于由多块面板组成的屋顶广告牌,相邻面板之间出现气动干扰.

Characteristics of Wind Pressure Distribution on Billboards on High Rise Building Roof

The wind pressure on four types of billboards on high-rise building roof, the arrangements of which are unilateral, adjacent , trilateral and peripheral, was measured with the rigid model pressure tests. The distribution characteristics of mean and fluctuating wind pressure coefficients on different types of billboards and the frequency-domain characteristics of the fluctuating wind pressure of typical pressure taps on the surfaces of the panels are discussed. The results show that the mean wind pressure coefficients and fluctuating wind pressure coefficients on the surfaces of the panels of various arrangements are relatively larger in skew wind case, with the coefficients near the edge larger than those on the inner areas. The extreme wind pressure coefficients distribution on billboards of various arrangements also shows some differences. The maximum extreme wind pressure appears on the unilateral model and the minimum pressure appears on the peripheral model. Aerodynamic interference is observed on the multi-panel billboards.