周边建筑对低矮建筑平屋盖上风压的干扰效应

Aerodynamic Interference of Wind Loads on Roofs of Lowrise Buildings

摘要:

通过刚性模型测压风洞试验对被同类周边建筑所包围的低矮建筑表面风压系数进行了测量,分析了周边建筑的建筑面积密度对目标建筑平屋盖风压系数分布状态的影响规律.试验结果表明：当低矮建筑被同外形、同高度的周边建筑包围时,随着周边建筑面积密度的增大,被包围建筑屋盖上斜风导致的锥形涡将逐渐消失,屋盖上不同部位的负风压极值将逐渐减小并趋于均一；当周边建筑面积密度分别为0.1,0.3和0.6时,被包围建筑屋盖上的最大负风压可分别减小为孤立建筑的80%,30%和20%.

Abstract:

According to a series of wind pressure measurement wind tunnel tests,the effects of area densities of surrounding buildings on distributions of wind loads on a flatroof building are studied.The test results indicate that when the area densities of the surrounding buildings increase,the conical vortices on the flat roof of the surrounded building for oblique wind directions will disappear gradually and the extreme values of suction pressures on different locations of the flat roof will decrease and become uniform.The maximum values of negative wind pressure on the flat roof of the surrounded building become 80%,30% and 20% of those of isolated buildings when it is surrounded by the buildings with the same geometric parameters but with different area densities of 0.1,0.3 and 0.6,respectively.