高层建筑平均风压的阻塞效应试验研究

Experimental Investigation of Blockage Effects on Mean Pressure of Tall Buildings

基于5组不同缩尺比的矩形高层建筑风洞试验模型,在两种不同湍流度强度风场下研究湍流度对高层建筑平均风压的阻塞效应影响。试验结果表明:同种风场下,阻塞效应对模型迎风面平均风压系数的影响较小,阻塞比的不同并没有引起迎风面压力分布的显著变化,阻塞比的增大使模型侧面和背风面平均风压系数降低较为显著。来流湍流增大会降低阻塞效应对平均风压系数的影响,湍流度增大对迎风面阻塞效应影响较小,但对高层建筑模型侧面、背面阻塞效应影响较大;最后,对低湍流度风场下阻塞效应修正公式进行了检验,并验证了高湍流度风场下阻塞效应修正公式的适用性。

Based on five groups of different scale wind tunnel test models, this paper researches the effect of turbulence on the blockage effect of mean wind pressure on tall buildings under two different tur-bulence intensity wind fields. The experimental results show that the effects of the blocking effect on the mean pressure coefficient on windward surface of the model are slight. The difference of the blocking ratio has little effect of the pressure distribution of the windward surface. The increase of the blocking ratio makes the mean pressure coefficient of the side surfaces and leeward surfaces decrease more obviously. However, the increase of the turbulence will reduce the effect of the blocking effect on the mean wind pressure coefficient, and the increase of turbulence intensity has little effect on the blocking effect of the windward surface but the turbulence increase has a great influence on the side surfaces and leeward surfaces of the tall building model. Finally, the correction results of the blocking effect are verified under the low turbulence wind field and the correction formula for mean pressure coefficient is proposed based on the high turbulence.