龙卷风作用下连续双坡屋面风荷载特性的数值模拟研究  

Research on numerical simulation of wind load characteristics of continuous double-slope roof under tornado effect

作　　者：张舒涵 李方慧[1] 赵方锐 寇佳茵 白宇 ZHANG Shuhan;LI Fanghui;ZHAO Fangrui;KOU Jiayin;BAI Yu(College of Civil Engineering,Heilongjiang University,Harbin 150086,Heilongjiang,China)

机构地区：[1]黑龙江大学建筑工程学院,黑龙江哈尔滨150086

出　　处：《工程建设》2025年第3期44-49,共6页Engineering Construction

摘　　要：为探究龙卷风作用下连续双坡屋面的风压分布规律,基于计算流体力学数值模拟,采用Realizable k-ε湍流模型,研究在30°、45°、60°等不同坡度条件下,涡流比分别为0.18、0.30、0.50、0.80、1.00、1.50且放置于龙卷风中心的双坡房屋建筑顶面风压分布。结果表明:1)当建筑物位于龙卷风中心时,屋面风荷载主要表现为吸力;随着坡角增加,最大负压略有下降,约减少1.5%,双坡屋面风压变化范围较小;2)随着坡角增大,右侧屋脊与双坡中心处易发生漩涡脱落,产生较大的负压,导致双坡屋面中心与右侧出现较大负压;3)随着涡流比增大,连续双坡屋面风压系数绝对值呈现先增后减再增再减的趋势,在涡流比为0.3和1.5的工况下,分别出现极大值1.680与极小值0.472,数值下降约72%;4)在低涡流比时,涡核半径较小,屋面风压变化显著;而在高涡流比时,风压等值线差值较小,屋面风压变化较为平缓。In order to explore the wind pressure distribution of continuous double-slope roofs under tornado,based on numerical simulations of computational fluid dynamics,the wind pressure distribution on the top surface of double-slope buildings under the 30°,45°,60°and other different slope conditions with vortex ratios of 0.18,0.30,0.50,0.80,1.00 and 1.50 placed in the center of the tornado is studied by using the Realizable k-εturbulence model.The results show that:1)When the building is located in the center of the tornado,the roof wind load is mainly manifested as suction;as the slope angle increases,the maximum negative pressure slightly decreases,which decreases about 1.5%,and the range of changes in the wind pressure on the double slope is small;2)As the slope angle increases,vortex falls easily at the right ridge and the center of the double slope,resulting in a large negative pressure,resulting in a large negative pressure on the center and the right side of the double slope;3)As the vortex ratio increases,the absolute value of the continuous double slope roof wind pressure coefficient shows a trend of increasing first and then decreasing,and then decreasing again.Under the operating conditions of vortex ratios of 0.3 and 1.5,the maximum value 1.680 and the minimum value 0.472 respectively appear,with a decrease of about 72%;4)At low vortex ratio,the vortex core radius is smaller,and the roof wind pressure changes significantly;while at high vortex ratio,the wind pressure contour difference is smaller,and the roof wind pressure changes are relatively gentle.

关 键 词：连续双坡屋面 龙卷风 涡流比 低矮建筑 数值模拟 

分 类 号：TF312.1[冶金工程—冶金机械及自动化]