错列布置超高层建筑群的干扰效应研究

Study of the interference effects of wind loads on tall buildings in staggered arrangement

对实际超高层建筑群进行群体和单体塔楼两次同步测压风洞试验。通过两次试验测量结果,考察风向及塔楼位置对顺风向、横风向和扭转方向的主体结构承受风荷载以及围护结构的极值风压的影响,并结合风压试验结果及CFD流场计算结果对干扰机理进行说明。研究结果表明,处于中间位置的2号塔楼的扭转干扰放大作用非常显著,较为不利的风向为110°风向,该风向下扭转方向的静力干扰因子达到1.53;沿弱轴Y方向和扭转方向的动力放大因子达到1.32和1.37。

To study the interference effects of wind loads on three similar-shaped tall buildings staggeringly located, wind tunnel tests for the tower group and one isolated tower were conducted respectively. By comparison of the measured results, effects of wind directions and building positions on the design local extreme pressure for the cladding of building and on the design wind forces for main wind-force resisting system, i. e., along-wind, cross-wind and torsion wind loads, were discussed. Interference mechanisms were analyzed by integrating CFD simulated results and experiment measured data. It indicates that wind loads of the middle tower, named tower 2, are greatly increased compared to the isolated case. In the unfavorable wind direction of tower 2 （ 110 degree） the static interference factor of torsion load, dynamicinterference factor of wind load in Y and torsion directions are 1.55, 1.32 and 1.37, respectively.