强风作用下超高层建筑风场特性的实测研究

为了获取在强风作用下超高层建筑的风场特性，基于风压测试基本原理，本文设计出了新型风压传感器。针对一超高层建筑设计了风场实测的实施方案，获得了超高层建筑顶部的风速风向纪录，记录了墙面六个测点的风压时程。基于高空风速风压同步实测结果，分别对实测场地的风速风向特征及墙面风压特征进行了分析。结果表明，特殊地形条件下的风速脉动不完全符合典型的风速谱，而且其概率密度函数有可能不符合高斯分布；在这种情况下的墙面风压也呈现出不同程度的非高斯特征，尤其是在分离流区域；脉动风压的空间相关性与风洞试验研究的结果具有相同的规律。

Full-scale measurement-based investigation on wind field characteristics of super tall buildings under strong wind gusts

Based on basic principle of the wind pressure testing, a new type of wind pressure sensor has been devised in this paper in order to obtain the wind field characteristics of super tall buildings under strong wind gusts. An implementation scheme of full-scale measurement wind field on a super tallbuilding is proposed. The wind velocity and directions on the top of the tall building are captured and moreover, the wind pressure time histories at six locations selected on the wall are recorded. Subsequently,the wind velocity and pressure data measured synchronously are analyzed so as to gain an insight into the characters of wind velocity, directions, and wind pressure. The results show that the wind velocity fluctuations may be not consistent with the typical velocity spectra. Likewise, the probability density functions (PDF) also may be not in obedience to the Gaussian distribution under the special terrain conditions. In this case, the wind pressure on the wall, especially in separated regions, also experience non-Gaussian characters to different degree. The spatial correlation of the wind pressure fluctuations is inagreement with that obtained from wind tunnel tests.