国家体育场大跨度屋盖结构风场实测研究

通过自主开发的基于无线传感技术的土木工程结构风场实测系统，对国家体育场大跨度屋盖上的风速风向进行了监测,获得了屋盖上的风场实测数据。经过对实测数据的分析,得到了平均风速和风向、阵风系数、湍流度以及脉动风速功率谱等风特性参数，分析结果表明大跨度屋盖上风场与自然来流特性存在较大差别，表现为非高斯特性明显﹑湍流度较大﹑脉动风速功率谱在较高频率处达到峰值﹑空间上不同点脉动特性相关度较弱；本文从实测角度上证明了大跨度屋盖结构不适用准定常假定

Field measurement of wind characteristics on roof of the national stadium

With the aid of self-developed measurement system based on wireless sensor network,field measurements of wind characteristics were conducted on the roof of the National Stadium.Boundary layer wind characteristics such as mean wind speed and direction,turbulence intensity,gust factor and power spectrum density of longitudinal wind speed etc were revealed.Analysis results show that there are remarkable differences between the characteristics of the wind on the roof and the nature wind,which represent the roof wind to be of high non-Gaussian characteristic,high turbulence,peaks of PSD function appearing in high frequency domain,and weak correlation among the oscillations at different points in space.It is proved that the theory of quasi-steady state is not applicable to the large-span roof structure.