台风“菲特”影响下温州某高层建筑顶部风场特性实测分析

Field measurements of wind field characteristics of a high-rise building in Wenzhou City during the passage of typhoon Fitow

东南沿海是我国经济发达地区,在沿海城市中心的高层建筑开展风场特性实测研究,对城市中心高层建筑的抗风设计具有重要的工程意义。本文基于2013年在温州市中心某高层建筑顶部实测获得的台风"菲特"的风场数据,研究获得了温州市中心高空台风风场的湍流度、阵风因子、峰值因子、湍流积分尺度和风速谱等风场特性。研究结果表明,湍流度、阵风因子和峰值因子随10min平均风速增大基本保持稳定;阵风因子随湍流度的增大而增大,且基本为线性关系;湍流度、阵风因子和峰值因子均随阵风持续时间的增加而减小,减小速率逐渐变缓,且变化曲率与Durst的经验曲线较为相似。

The southeast coast is the most economically developed area of China. The research of wind characteris- tics field measured on the top of high-rise building in the center of the coastal city has great engineering signifi- cance. In this paper, the wind characteristics of typhoon ＂fitow＂, such as turbulence intensity, gust factor, peak factor, turbulence length scale and power spectra, are discussed on the basis of long-time measurement data recor- ded on the top of high-rise building in Wenzhou city in 2013. The research results show that turbulence, gust factor and peak factor remain almost constant with the increase of mean wind speed. The gust factors increase with the tur- bulence intensities with an approximately linear pattern. The turbulence intensities, gust factors and peak factors de- crease with the increase of the gust duration, and the rate of decrease exhibits a gradual decline. In addition, the turbulence intensities, gust factors and peak factors during the landfall of the typhoon are in agreement with Durst＇ S.