双曲面屋盖的平均风压特点

通过风洞模拟实验对双曲面形屋盖的平均风荷载特点进行了研究.文中给出了屋盖的平均风荷载随风向角改变的变化特点和规律,特别讨论产生这些特点的原因及其流动机理.结果表明,在所有风向角下,双曲面屋盖除了在位于下游的边缘的挑檐位置外,都是负压分布.局部负压最大值主要出现在迎风挑檐的边缘部分.虽然屋盖的局部负压峰值随风向角改变,位置和数值变化都很大,然而,作为屋盖整体,平均风压平均值随风向角的变化很小.有关结果为类似建筑项目的风荷载设计和相应规范的制定和修改提供了有用的信息和材料.

Characteristics of Mean Wind Loading on Hyperboloid Roof

Wind loading on a hyperboloid roof of a stadium was conducted by means of wind tunnel test.The characteristics of time-mean pressure distributions on roof were investigated and discussed.The features of pressure distributions along with the angle of wind directions were discussed,as well as the relationship between the pressure distributions and the mechanism of fluid flow.It is shown that under all wind directions,the pressure distributions on the roof are almost all negative,except some local area on the eaves structure located in downstream.The peak negative pressures occur on the leading edge of the roof.Although both the values and locations of local peak negative pressure changed a lot with the wind directions,the total averaged time-mean pressure on the roof change very small.It is helpful to other similar projects,as well as to the code establishment and modification.