润扬大桥悬索桥桥址风环境的长期监测与分析

基于结构健康监测系统记录的2006年桥址日常持续风环境数据,开展了润扬大桥悬索桥桥址平均风特性及湍流脉动特性的分析研究,给出了湍流度、阵风因子、湍流积分尺度及脉动风功率谱密度函数的推荐值或公式,进一步研究了平均风速与上述湍流特征参数的相关性以及湍流特征参数之间的相互关系.分析结果表明:①湍流度、阵风因子和湍流积分尺度的实测统计值均高于规范推荐值;②纵向风谱拟合模型与Simiu谱较为接近,但横向风谱拟合模型则与之相差较多,并且都存在拟合模型中湍流动能往高频偏移的现象;③湍流度、阵风因子和湍流积分尺度之间存在较为明显的相关性,并且与平均风速也存在一定的相关性.

Long-term monitoring and analysis of the wind environment at the site of Runyang Suspension Bridge

On the basis of the filed measurements of the wind environment during the year 2006 collected by the structural health monitoring system, the characteristics of the mean wind and the fluctuation wind is presented at the site of Runyang Suspension Bridge. The recommended values and functions of turbulence intensity, gust factor, integral length and turbulence power spectrum are proposed. The correlation analysis is further performed among the mean wind speed and the turbulence characteristic parameters. The results reveal that: ① the statistical values of turbulence intensity, gust factor and integral length based on the measurements are larger than the values recommended by the code; ② there is a relative good fitting result between the fitted longitudinal fluctuation wind speed spectrum and the Simiu spectrum. However, a considerable error exits between the fitted lateral fluctuation wind speed spectrum and the Simiu spectrum. Both two fitted spectrums show the turbulent kinetic energy shifts to the high frequency. ③ there exist remarkable correlations among turbulence intensity, gust factor and integral length, which also have correlations with the mean wind.