Experimental research on the characteristics of mean wind loads of high-rise buildings controlled by upper-surface suction

In order to reduce wind loads and improve wind-resistance performance of a super high-rise building, a suction control system was designed for implementing wind tunnel test of the super high-rise building model controlled by upper-surface suction. Based on the experimental results, effects of both orifice geometrical parameter and suction flux parameter on characteristics of mean wind loads of the model under different wind directions were analyzed. The experimental results show that reduction of the mean pressure coefficient and level drag coefficient within the suction-controlled zone are more significant than those are far away from the suction-controlled zone. Besides, reduction of wind loads in the suction-controlled zone is more significant under larger flux coefficient. And when absolute value of the flux coefficient is changed from 0.004 57 to 0.017 4, the level drag coefficient of the model's upper-surfaces could be increased from 0.094 to 0.231. Finally, effect of suction control is quite different under different wind direction, and the drag could even be increased in some directions. Therefore, the optimal location of suction orifice to acquire effective drag reduction should be determined by dominant wind direction of the on-site building.