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为研究雷暴冲击风对拱形屋面的作用,基于相似准则进行了拱形屋面模型制作和雷暴风风场物理模拟,并完成了相应的冲击风风洞试验。通过改变矢跨比、高跨比及跨度,进行屋面风压的参数敏感性研究。通过改变屋面中心位置,研究竖向风场的作用。研究表明:屋面位于冲击风极值水平风速附近时,垂直于屋脊方向风压分布与矢跨比密切相关,屋面越靠近冲击风中心则升力越小;当屋面位于冲击风中心时,整个屋面均出现较大的正风压。
In order to study the effect of thunderstorm impinging wind on arched roof, making arched roof model and physical simulation of thunderstorm wind field based on similarity criterion, the corresponding impact wind tunnel test was completed. By changing the ratio of pitch to span, span ratio and span, the parameter sensitivity of roof wind pressure is studied. Study the effect of vertical wind field by changing the center of the roof. The results show that the wind pressure distribution perpendicular to the ridge direction is closely related to the ratio of the span to the roof when the roof is located near the extreme wind speed of the impact wind, and the lift is smaller when the roof is near the center of the impact wind. When the roof is located in the center of the impact wind, A larger positive pressure appears.