摘要
基于计算流体动力学理论,采用雷诺平均法对下击暴流下单立柱四面式广告牌结构风压分布进行了三维数值计算。结合各面板风压系数分布图和总风压系数曲线,分析了风向角、径向距离对广告牌风压分布特性的影响,并得出了风压系数极值及其出现位置。结果表明:各面板上下边缘的风压系数对加速气流吸力的影响较为敏感,总风压系数曲线在面板交接处附近均会出现压力极值;在α=15°时,面板C、D的总风压系数极大值接近1.6;风压系数分布规律不会随径向距离的变化而改变,广告牌表面总风压系数随径向距离增加而降低;风压系数极值易发生于面板四周边缘,在抗风设计时要注意加强相应区域。
Based on the theory of computational fluid dynamics,three-dimensional numerical calculation of the single-pillar four-sided billboard’s wind pressure distribution has been studied by using the Reynolds average method under the downburst.The influences of radial distance and wind direction angle on the wind pressure distribution characteristics of billboards were analyzed by using the pressure coefficient distribution diagram of each panel and the total pressure coefficient curve.Moreover,the extreme wind pressure coefficient and its appearance position were achieved.The results show that the total pressure coefficient of the upper and lower edges is more sensitive to the influence of the acceleration airflow suction,and the total pressure coefficient curve near the junction of the panels is in pressure extremes.In the case ofα=15°,the pressure coefficient of panel C and D is close to 1.6 at the maximum.The distribution law of pressure coefficient does not change with variation of the radial position,and the pressure coefficient decreases with the increasing of the radial distance.The extreme wind pressure is easy to occur around the edge of the panel,strengthening the corresponding area of the billboard in the wind design should be focused on.
作者
宋阳
唐彪
吕海宇
SONG Yang;TANG Biao;Lü Haiyu(Sinomach Tdi International Engineering Co.,Ltd.Xuoyang 471003,China;China Construction Third Bureau First Construction Engineering Co.,Ltd.,Wuhan 430040,China;College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China)
出处
《四川建筑科学研究》
2022年第5期35-43,共9页
Sichuan Building Science
关键词
下击暴流
四面式广告牌
风向角
径向距离
风压系数极值
downburst
four-sided billboard
wind direction angle
radial distance
extreme wind pressure coefficient
