Y形截面超高层建筑风压分布的试验研究

Experimental Investigation on Wind Pressure Distribution of Y-shape Super High-rise Buildings

对某Y型截面超高层建筑进行同步测压风洞试验,详细分析建筑表面平均风压和峰值风压分布特征。研究结果表明:Y型建筑迎风面中间区域平均风压系数为0.5~0.8且随高度的增大逐渐增大;由于迎风面两侧边缘区域发生气流分离,使得两侧边缘区域平均风压系数为负值;全风向最大峰值正压系数沿建筑高度呈逐渐增大的趋势,全风向最大峰值负压系数在四周边缘处绝对值较大,往中心区域逐渐减小;在幕墙抗风设计时,峰值负压起主要控制作用。

A synchronous pressure measurement wind tunnel test was conducted on a Y-shaped super high-rise building,and the distribution characteristics of the mean and peak wind pressure and peak wind pressure on the building surface were analyzed in detail.The measured results show that the mean wind pressures coefficient in the middle area of the windward side of the Y-shaped building is 0.5~0.8 and gradually increases with the increase of height.Due to the separation of airflow in the edge areas on both sides of the windward surface,the mean wind pressure coefficient in the edge areas on both sides is negative.The maximum peak positive pressure coefficient in all wind directions gradually increases along the height of the building.The absolute value of the maximum peak negative pressure coefficient in all wind directions is larger at the edges and gradually decreases toward the central area,which indicates that the peak negative pressure plays the main role in the wind resistance design of the curtain wall.