普立特大桥桥位处山区风特性实测研究

发布时间：2018-05-04 02:26

本文选题：山区风 + 现场实测　；参考：《西南交通大学学报》2016年02期

【摘要】：为了获取偏远山区的风场特性,以普立特大桥桥位处风场实测项目为研究背景,开发了基于无线传输的高频风速仪数据采集系统,分析了桥位处的平均风特性,并对实测脉动风的非平稳与非高斯特性进行了探讨.研究结果表明:与传统方法相比,新开发的无线传输系统具有实时传输、成本低及无需现场监测等优势;桥位处的大风期主要集中在2~4月份,且大部分发生在西南方向;在选取的强风天气中,出现山区雷暴风的比例约为15%;实测强风的平均风攻角主要在-10°~0°范围内波动;拟合出的风剖面指数波动范围为0~0.14,且其拟合概率密度分布的均值0.056明显小于规范规定的最小值0.12,说明规范规定的风剖面指数不足以描述山区风;山区风出现了同时具有非平稳与非高斯特性的风速样本,且其瞬时最大风速可达22.0 m/s.
[Abstract]:In order to obtain the wind field characteristics in remote mountain areas, a wireless transmission data acquisition system for high frequency anemometer is developed, and the average wind characteristics of the bridge are analyzed. The non-stationary and non-Gao Si characteristics of the measured pulsating wind are also discussed. The results show that: compared with the traditional methods, the newly developed wireless transmission system has the advantages of real-time transmission, low cost and no need for on-site monitoring, the gale period at the bridge is mainly concentrated in February / April, and most of it occurs in the southwest direction. In the selected strong wind weather, the proportion of thunderstorm in mountain area is about 15, the average wind attack angle of measured strong wind mainly fluctuates in the range of -10 掳~ 0 掳; The fluctuation range of wind profile index is 0 ~ 0.14, and the mean value of fitting probability density distribution is obviously less than the minimum value of 0.12, which indicates that the wind profile index specified in the code is not enough to describe mountain wind. A sample of wind speed with both non-stationary and non- characteristics appears in the mountain wind, and its instantaneous maximum wind speed can reach 22.0 m / s.
【作者单位】：西南交通大学土木工程学院风工程试验研究中心;
【基金】：国家自然科学基金资助项目(51578471);国家自然科学基金青年科学基金资助项目(51408504) 交通运输部西部课题资助项目(201231835250)
【分类号】：U442

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