强风下不同高度低矮建筑间干扰效应研究

Wind-induced Interference Effects of Low-rise Buildings with Different Heights under Strong Wind

以往研究已经认识到相对高度对低矮平屋面建筑风荷载分布有着直接的影响,但双坡屋面房屋气动特性与之存在差别。为研究相对高度对双坡屋面建筑风荷载分布与风致干扰效应影响,以2016年莫兰蒂台风登陆东南沿海某地区实测强风数据为基础,采用计算流体动力学方法,对不同高度的两栋低矮建筑与该地区不规则低矮建筑群模型的屋面风荷载进行数值模拟,并研究其风致干扰效应。研究结果表明:对于两栋低矮建筑,当高度比小于2时,随着高度比的增加,受扰房屋背风屋面负风压系数绝对值减小。在迎风屋面上,当高度比大于1时屋面风压为负,且随着高度比的增加迎风屋面负风压系数也随之增大。对于此不规则低矮建筑群,60°为抗风最不利风向角。整体上,高度增加的房屋其屋面负风压系数出现增大,高度不变的房屋屋面负风压系数减小。

Previous investigations verified that the relative height of low-rise flat-roof buildings have a notable effect on the wind load distribution.However,similar studies on the gable roofed building is so limited.In this study,the computational fluid dynamics method was used to simulate the wind load and wind-induced interference effects between two low-rise buildings and irregular low rise building group at different heights,based on the meteorological data of typhoon Meranti landed in a coastal area of southeast China in 2016.Results showed that the negative wind pressure coefficients of the leeward roof of the disturbed building decreases with increases in the height ratio when the height ratio is less than 2 between two low-rise gable roof buildings.The wind pressure coefficients of the leeward roof are negative and will increase with increasing height ratio when the height ratio is greater than 1.For the irregular low-rise building group,a wind angle of 60 degree is the most unfavorable wind direction.Overall,the negative wind pressure coefficients of the roof increase if the height increases and decrease with a constant height.