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风致干扰效应是高层建筑群抗风设计中的常见难点问题之一。采用刚性模型测压试验,研究了均匀层流和两种大气边界层风场条件下任意排列两方形断面高层建筑的风致干扰效应,通过平均和脉动基底弯矩系数的干扰因子、风力系数、风压系数分布以及风荷载功率谱的研究,解释了其风致干扰效应的机理。结果表明,任意排列的两方形断面高层建筑风致干扰中,至少存在横风向静力干扰、顺风向静力干扰和横风向动力干扰三个值得注意的干扰区域。窄道形成的加速效应使受扰结构上形成指向施扰建筑横风向平均吸力和阻塞形成的受扰建筑的横风向平均推力;遮挡效应使得受扰建筑承受指向位于上游的施扰建筑的顺风向风力;漩涡叠加增强位于尾流区受扰建筑上的横风向脉动荷载。不同风场的试验结果表明,提高来流的紊流度有助于减弱上述干扰效应。
Wind-induced interference is one of the most common and difficult problems in wind-resistant design of high-rise buildings. Using the rigid model pressure test, the wind-induced disturbance effect of arbitrary arranged double-section high-rise buildings under uniform laminar flow and two kinds of atmospheric boundary layer wind fields was studied. By means of the average and fluctuating base moment coefficient interference factors, wind force coefficient, Pressure coefficient distribution and wind load power spectrum of the study explained the mechanism of its wind-induced interference effect. The results show that there are at least three notable disturbing areas in wind induced disturbance of two-sided high-rise buildings with arbitrary arrangement, including static wind disturbance, windward disturbance and cross-wind disturbance. The accelerating effect of the narrowing makes the cross-wind direction average thrust of the disturbed structure formed on the disturbed structure to the disturbed building formed by the mean suction and obstruction in the crosswind direction of the disturbing building; the obstruction effect makes the disturbed building bear the downwind direction to the disturbed building located at the upstream Wind; swirl stacking enhances transverse wind pulsating loads on disturbed buildings in the wakes. The experimental results of different wind farms show that increasing the turbulence of incoming flow can help reduce the above-mentioned interference effect.