台风外围影响下的大跨度拱桥桥址区近地风特性实测研究

发布时间：2018-02-09 09:20

本文关键词： 台风“鲸鱼” 大跨度拱桥场地实测平均风特性脉动风参数　出处：《湖南大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：基于南广铁路肇庆西江特大桥风速风向监测子系统,对2015年6月台风"鲸鱼"气候条件下的平均风速、平均风向以及脉动参数(紊流强度、阵风因子、紊流积分尺度、脉动风速功率谱等)开展实测研究.结果表明:台风外围影响下1min平均风速波动幅度较大,呈现出跳跃性;实测紊流强度离散性较低,纵向紊流强度实测值0.253,紊流强度和阵风因子有随平均风速的增大而减小的趋势特征,且该趋势在低平均风速段更为明显;各方向上紊流积分尺度与规范相应推荐值差别较大,流场中主要以中小尺度涡旋为主,其离散度随平均风速的增加略有增大;规范推荐的Kaimal谱与实测水平向脉动功率谱函数并不能很好地符合,台风"鲸鱼"在低频段和高频段的谱值均偏高.实测表明台风外围风场具有一定相关性,采用Davenport假设会带来一定误差.
[Abstract]:Based on the wind speed and wind direction monitoring subsystem of Xijiang Bridge in Zhaoqing, the mean wind speed, mean wind direction and pulsating parameters (turbulence intensity, gust factor, turbulence integral scale) of June 2015 typhoon "whale" climate were studied. The results show that under the influence of typhoon, the fluctuation amplitude of mean wind speed in 1 min is large and the wind speed is jumping, and the dispersion of measured turbulence intensity is relatively low. The measured value of longitudinal turbulence intensity is 0.253, the turbulence intensity and gust factor decrease with the increase of mean wind speed, and the trend is more obvious in the low average wind speed, and the difference between the integral scale of turbulence and the corresponding recommended value of the code is great. The flow field is dominated by mesoscale vortices, whose dispersion increases slightly with the increase of mean wind speed, and the Kaimal spectrum recommended by the code does not agree well with the measured horizontal pulsation power spectrum function. The spectral values of Typhoon "Whale" are both high in low frequency and high frequency range. The measured results show that the wind field around the typhoon is correlated to a certain extent, and the Davenport hypothesis will bring some errors.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51322808,51508580,U1534206)~~
【分类号】：U448.22

【相似文献】