【作者】 王程； 李方慧；

【Author】 WANG Cheng;LI Fang-hui;School of Hydraulic and Electric Power, Heilongjiang University;School of Construction and Engineering, Heilongjiang University;

【机构】 黑龙江大学水利电力学院； 黑龙江大学建筑工程学院；

【摘要】 积雪不均匀分布导致的山谷及背风面雪堆积是造成多跨双坡屋盖坍塌的主要原因之一。本文通过欧拉-欧拉法针对风吹雪过程中积雪不均匀分布状况对多跨双坡屋盖进行风致雪漂移的两相流模拟,对比坡度变化下屋面积雪分布系数的变化以及对不同风向角下雪堆积位置度转移进行分析。结果表明:在风向角为0°和90°时,对结构而言,来流较为对称,积雪分布也较为对称,而对于其他风向角而言,积雪不均匀分布较为明显,主要堆积在两跨交接处的背风一侧。在低坡度屋面中,坡度为10°时,屋盖积雪分布较为均匀,但随着坡度增大,第二跨与第三跨连接处无量纲化雪深有一个小幅的上升,并在25°时达到了最大值1.15。当坡度继续增大时,屋盖积雪分布变化趋于稳定。更多还原

【Abstract】 The accumulation of snow in the valley and leeward surface caused by the uneven distribution of snow is one of the main reasons for the collapse of multi-span slope roof.Through the Euler-Euler method, the two-phase flow simulation of wind-snow drift is analyzed, comparing the change of roof snow distribution coefficient and the transfer of snow accumulation at different wind angles.The results show that at the wind direction angles of 0° and 90°, the inflow is more symmetrical for the structure, and the snow cover distribution is also more symmetrical, while for other wind direction angles, the snow cover uneven distribution is more obvious,mainly accumulating on the lee side at the junction of the two spans. In the low slope roof, when the slope is 10°,the snow distribution of the roof cover is relatively uniform, but as the slope increases, the connection between the second and the third span has a small rise, and reaches the maximum value of 1.15 at 25°. When the slope continues to increase, the roof snow distribution change tends to stabilize.更多还原