粗糙条对某超高层建筑风荷载影响的风洞试验研究

超高层建筑外幕墙围护结构的骨架等粗糙条构件，会改变建筑表面绕流形态，从而对风效应产生影响，但目前我国建筑结构荷载规范中尚缺乏相关规定。文中以某典型超高层建筑项目为研究对象，对建筑模型表面设置粗糙条与去除粗糙条两种工况进行刚性模型同步测压试验对比研究，通过分析建筑模型表面风压系数、基底倾覆弯矩和体型系数等风荷载特性的变化，以研究建筑表面粗糙条对超高层建筑结构风荷载的影响规律。研究表明：设置粗糙条对建筑表面极值正压影响不大，但会显著降低建筑表面极值负压绝对值、最大降幅约39.8%，将显著影响建筑角区及侧风面，使建筑侧风面的平均和脉动风压系数显著减小、最大减幅分别为24%和30%，整体上，设置粗糙条有利于建筑围护结构的抗风设计。设置粗糙条会影响结构整体风荷载，在0°正吹风向角下，粗糙条会使建筑沿层高分段风荷载体型系数略微增大、最大增幅约为8%，使塔楼基底绕X轴的倾覆剪力和倾覆弯矩略微增大、增幅分别为4.9%和6.0%；设置粗糙条对建筑顶部峰值加速度极值出现的风向角有影响，且可降低峰值加速度幅值，降幅约为7.91%。

Wind Tunnel Test Research on the Effect of Rough Strips on Wind Loads of A Super High-Rise Building

Rough strips such as curtain wall skeletons affiliated with the outer curtain wall envelopes of super high-rise buildings will change the flow pattern around the building, thereby affecting the wind loading characteristics of the buildings. However, the current Chinese building structural load code lacks relevant regulations in this regard. Given this, a systematic comparative study on a typical super high-rise building was performed under the two conditions of with and without the rough strips on the building surface by means of the HFPI (High Frequency Pressure Integration) test. By analyzing the changes of the wind loading characteristics such as wind pressure coefficient, base overturning moment and structural shape factor of wind load, the effect of rough strips on the wind load of the super high-rise building structure was studied. The results show that: setting of rough strips has little effect on the positive pressure on the building surface, but it will significantly reduce the absolute value of the peak negative pressure, with a maximum decline of about 39.8%; it will significantly affect the wind pressure distribution in the building corner area and lateral sides, leading to the significant reduction of the mean wind pressure coefficient and fluctuating wind pressure coefficient in the lateral sides, and the maximum decline is 24% and 30%, respectively. Overall, setting rough strips is beneficial to the wind-resist design of the building claddings. Setting of rough strips will affect the overall wind load of the structure. At a positive blowing angle of 0°, the rough strips will slightly increase the structural shape factor of the wind load in sections along the height of the building, with a maximum increase of about 8%, and the base overturning shear force and base overturning bending moment of the X-axis will slightly increase by 4.9% and 6.0%, respectively. Setting the rough strips has an impact on the wind angle of the peak acceleration at the top of the building, and can reduce the peak acceleration by about 7.91%.