北京城区强风湍流度的统计分析

对北京气象塔2005—2007年强风湍流数据进行了统计分析,得到湍流度的变化规律.对顺风向、横风向及竖向的湍流度进行了拟合,并与日本风荷载规范的顺风向湍流度剖面做了对比分析.结果表明：在47 m高度处,湍流度随平均风速呈现先减后增的变化规律,并且顺风向、横风向、竖向的变化规律保持一致;实测湍流度之间的线性相关性非常明显,与Solari和Piccardo经验公式存在一定的差别;顺风向湍流度的实测值与日本规范相比在低空段差距较大,在高空段几乎接近.

Statistical Analysis of Strong Wind Turbulence Intensity in Beijing Urban Area

Based on the statistic analysis of strong wind turbulence data measured at the Beijing meteorological tower from 2005 to 2007, the variation of turbulence intensity is obtained. The curves of the alongwind, lateral and upward turbulence intensities are fitted. And the alongwind turbulence intensity curve of the Japanese wind load specification is compared with the one fitted. The results clearly demonstrate that at the height of 47m, the turbulence intensities at three directions firstly decrease and then increase with the rise of mean wind speed. A very obvious linear correlation is obtained among the measured turbulence intensities, which is somewhat different from the empirical formula of Solari and Piccardo. Compared with the Japanese wind load specification, the alongwind measured turbulence intensity reveals that there is a large gap in the lower space section, while almost the same in the upper space section.