超高层建筑风压的幅值特性

对方形、矩形、三角形及Y型等10个典型的超高层建筑模型进行了细致的风洞试验，获得了模型表面的平均风压和脉动风压系数．详细讨论了风场和风向角对风压系数空间分布（不同高度分布，同一高度不同侧面上不同测点的风压分布等）的影响．结果表明：建筑物迎风面处于正压区；而侧面和背风面是负压区；D类风场的平均风压系数和B类风场中相近，但根方差风压系数要大很多；迎风面的平均风压系数随高度变化基本服从2α分布；三角形和Y形模型的风压系数小于方形和矩形模型．

Characteristics of Wind Pressure Amplitude on Super-Tall Buildings

10 typical super-tall building models of different cross-section shapes, such as square, rectangular, triangular and Y-type cross-section shapes, and aspect ratios and side ratios are tested in a wind tunnel, and the mean and fluctuating wind pressure coefficients are thus obtained. It also discusses in this paper the effects of wind turbulence and wind direction conditions on the spatial distribution characteristics of the wind pressures. Results indicate that the mean wind pressures on the windward wall are positive while those on the side-walls and the back wall are all negative; the mean wind pressure coefficients on the models in terrain category D are almost the same with those in terrain category B, but the fluctuating wind pressure coefficients much larger; the profiles of mean wind pressure coefficients on the windward walls of the models obey basically the power law with an index of 2 and; the wind pressures on the triangular and Y-type buildings are smaller than those on the square and rectangular buildings.