均匀风场中高层建筑平均风力的阻塞效应

Experimental Investigation of Blockage Effects on Mean Wind Forces on Tall Buildings in Uniform Flow

摘要:

以联邦航空咨询委员会协调人会议（CAARC）高层建筑标准模型为例，在同济大学TJ 2建筑风洞中进行了矩形单体高层建筑的阻塞效应试验研究.对阻塞度为4.1%、6.1%、8.4%、10.1%的建筑刚性模型在均匀风场中进行了测压试验.主要研究了阻塞效应对模型平均风力特性的影响.研究结果表明：在均匀来流中，建筑各层的平均阻力系数随着阻塞度的增加而增大，但阻力系数沿高度的分布规律没有显著变化；顺风向平均基底弯矩系数随着阻塞度的增大显著增大.最后，基于试验结果提出了平均阻力系数和顺风向平均基底弯矩系数的阻塞效应修正公式.

Abstract:

Blockage effects of single rectangular tall building were investigated by Commonwealth Advisory Aeronautical Research Council (CAARC) Standard Tall Building Model in the TJ 2 Boundary Layer Wind Tunnel in Tongji University. The wind pressure tests of rigid models whose blockage ratios were 4.1%, 6.1%, 8.4% and 10.1% were carried out in the uniform flow. The blockage effects on mean wind force characteristics of model was emphasized. The results show that in the uniform flow, mean drag coefficient of each layer increases with the increasing of blockage ratio, while the distribution of drag coefficient along the height of buildings changes little. Along wind mean base bending moment coefficient of buildings also increases with the increasing of blockage ratio. Finally, new correction formula of blockage effect of mean drag coefficient and along wind mean base bending moment coefficient were put forward based on the wind tunnel test results.