下击暴流作用下高层建筑物表面风压分布特性

以CAARC（英联邦航空咨询理事会）高层建筑物标准模型为研究对象,基于计算流体动力学方法研究了下击暴流作用下高层建筑物的表面风压分布特性,并将结果同大气边界层近地风作用下的风压分布特性进行了比较分析.结果表明：下击暴流作用下建筑物模型迎风面风压力最大值位于建筑物的中下部约1/3高度处,不同于近地风作用下的最大值位于建筑物中上部靠近顶部附近;在背风面,下击暴流作用下负压力分布呈下小上大、中间小两侧大的特征,不同于近地风作用下的负压力分布较为均匀、上下端和两侧较大、中间小的分布特性.

Mean wind pressure distribution characteristics on tall building under downburst

Based on computational fluid dynamics(CFD) numerical simulation technique,the downburst-induced mean wind pressure on the Commonwealth Advisory Aeronautical Council(CAARC) standard tall building was predicted.The mean wind pressure distribution characteristics of CAARC standard tall building were analyzed and compared with mean wind pressure distribution characteristics under atmospheric boundary layer wind.The results indicate that the maximum mean wind pressure on windward side is located at about 1/3 of the bottom of the building,which is different from the top part under atmospheric boundary layer wind;on the leeward side,negative wind pressures on top of building under downburst are larger than bottom and the both sides are larger than the middle,while the negative wind pressures is comparatively well distributed under atmospheric boundary layer wind and negative wind pressures on top,bottom and two sides of building are larger than middle.