基于两相流模型的大跨屋面风吹雪数值模拟分析OA

Unbalanced snow loads caused by snowdrift are one of the main reasons for damage to large-span roofs under snow events.Existing codes do not consider the effect of wind speed and direction on snow load distribution on roofs.In this study,numerical simulations of snowdrift on a large stadium roof were conducted based on a two-phase flow model.The uneven distribution of roof snow under different wind speeds and directions was investigated,and the influence of roof shape was discussed.The results show that when the wind speed is constant,snow particles located on the leeward side of the roof tend to deposit,and snow particles on the sidewind side tend to erode.At low wind speeds,the distribution of snow on the roof tends to be uniform and less affected by wind direction.At high wind speeds,the uneven distribution of snow on the roof is obvious,and in different wind directions,the snow particles in the same area may be in two states:complete erosion or deposition.As wind speed increases,the area of snow erosion increases.Compared with the snowpack under the daily average wind speed,the snowpack under the 50-year return period wind speed is reduced by 1/3 and the most unfavorable snow pressure is more than twice as large.The snow load distribution of large-span roofs is greatly affected by wind speed and direction,and it is necessary to comprehensively consider their impact on snow loads during structural design.