Amplitude characteristics of wind loads on typical super-tall buildings

In this paper,10 typical super-tall building models were tested in a wind tunnel to measure the mean and fluctuating wind pressure distributions.The mean and RMS coefficients of the drag,lift and torsion momemt on the measuring layers were then obtained from the wind pressures.The variations of these coeffieints with wind direction are investigated,and the effects of the aspect ratio and side ratio of cross-section of the square and rectangular buildings on the wind loads are also discussed.The results show that the wind loads on the other three kinds of buildings,i.e.the buildings with triangular,square with four corners cut off and Y-shaped cross-sections are less than those on the square and rectangular buildings;the increasement of the aspect ratio of the square buildings results in the increase of the RMS coefficient of the lift;with the augmentation of the side ratio of the rectangular buildings,the mean and RMS coefficients of the drag decrease and the RMS coefficients of the lift increase;the terrain condition has less effect on the mean wind forces acting on the buildings,while the RMS fluctuating wind forces in the terrain category D are generally larger than those in terrain category B.