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不同于常规风,龙卷风是极强的小尺度系统,其作用方位的变化对结构表面的风压分布有一定的影响。为深入研究这种影响,本文采用CFD数值技术,假定结构处在龙卷风的移动路径上,模拟龙卷风以四种不同的方位角(0°,30°,60°,90°)作用于结构,得到结构屋面风压的分布状况。研究发现:各工况下屋面均表现出较强的吸力效应;并对16种工况进行整理得到两种分压分布形式(分布Ⅰ、分布Ⅱ),根据分布规律提出了屋面分区的建议方法。从所得分区风载体型系数值可看出是明显区别于现行结构风荷载规范中的取值,说明重要结构的抗龙卷风设计是非常必要的。
Unlike conventional winds, tornadoes are extremely small-scale systems whose changes in azimuthal orientation have some effect on the wind pressure distribution on the surface of the structure. In order to further study this effect, CFD numerical technique is used in this paper. Assuming that the structure is on the moving path of tornado, the simulated tornado acts on the structure at four different azimuth angles (0 °, 30 °, 60 °, 90 °) Structural roof pressure distribution. The study found that: the roofing showed a strong suction effect under all conditions; and two kinds of partial pressure distribution (distribution Ⅰ, distribution Ⅱ) were obtained by sorting 16 kinds of working conditions. According to the distribution law, the proposed method of roof partition . It can be seen from the value of the wind load coefficient coefficient of the subarea that it is obviously different from the value of the wind load code of the current structure, which shows that the anti-tornado design of the important structure is very necessary.