西江大桥桥位处实测良态风非平稳特性

发布时间：2018-06-18 02:21

本文选题：高速铁路 + 钢箱提篮拱桥　；参考：《中南大学学报(自然科学版)》2017年05期

【摘要】：以南广(南宁—广州)铁路西江大桥风环境监测子系统实测风场数据为研究对象,选择2次强良态风样本,运用经验模态分解法(EMD)和小波分析对强风样本进行非平稳分析,建立基于EMD分解和小波分析的非平稳风速模型,并将其与传统平稳风速模型计算结果对比分析。研究研究表明:西江大桥桥位处良态风非平稳特征明显;采用平稳风模型计算的紊流强度、阵风因子、积分尺度均比相应非平稳风模型计算的大;对于脉动风概率密度分布,非平稳风速模型比平稳模型更符合正态分布假定;2种风速模型计算的顺风向功率谱密度在低频段吻合较好,而在高频段非平稳风模型功率谱密度计算结果小于平稳风模型计算结果;Karman谱在高频段与2种计算模型功率谱密度结果较吻合,但在低频段存在较大差异。
[Abstract]:Taking the wind field data from the wind environment monitoring subsystem of the Xijiang bridge in Nanguang (Nanning Guangzhou) railway as the research object, 2 strong wind samples are selected, the non stationary analysis of strong wind samples is carried out by empirical mode decomposition (EMD) and wavelet analysis, and a non-stationary wind speed model based on EMD decomposition and wavelet analysis is set up, and it is used as the traditional flat wind velocity model. The study shows that the non-stationary wind of the West River Bridge is not stable, and the turbulence intensity, the gust factor and the integral scale calculated by the stationary wind model are larger than that of the corresponding non-stationary wind model, and the non stationary wind velocity model is more consistent with the probability density distribution of the fluctuating wind than the stationary model. The combined normal distribution assumption; the 2 wind velocity models are in good agreement with the low frequency band, while the power spectral density of the non stationary wind model in the high frequency section is less than that of the stationary wind model. The Karman spectrum is in good agreement with the power spectral density of the 2 models at the high frequency, but there is a great difference in the low frequency section.
【作者单位】：中南大学土木工程学院;中南大学高速铁路建造技术国家工程实验室;
【基金】：国家自然科学基金资助项目(51178471,51322808) 教育部新世纪优秀人才支持计划项目(NCET-12-0550) 长江学者和创新团队发展计划项目(IRT1296) 中国博士后科学基金资助项目(2014M562133)~~
【分类号】：U442.59

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