空旷平坦地面非平稳强风湍流特性研究

张少锋 ;楼文娟;吕中宾;段志勇;黄铭枫

振动与冲击 ›› 2014, Vol. 33 ›› Issue (23) : 68-73.

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (23) : 68-73.
论文

空旷平坦地面非平稳强风湍流特性研究

  • 张少锋 1 ,楼文娟2 ,吕中宾1,段志勇2,黄铭枫2
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Analysis on nonstationary strong wind characteristics over an open flat terrain

  • ZHANG Shao-feng1, LOU Wen-juan2, LV Zhong-bin1DUAN Zhi-yong2, HUANG Ming-feng2
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摘要

根据1128h的实测强风风速样本,对某空旷平坦地貌下10m高度处的非平稳强风风场湍流特性进行了研究。基于平均风速在基本时距内的平稳性,建立了非平稳强风风场的平稳风速模型和非平稳风速模型,分别计算这两类模型下的各风场湍流特征参数并加以对比。结果表明:55%的实测风速样本具有较强的非平稳性,采用非平稳风速模型更能反映实际风场风速;研究湍流特征参数随平均风速的变化规律,其中湍流强度随风速变化不明显,主要集中在0.16~0.20,大于我国现行荷载规范规定的B类场地10m高度名义湍流度值0.14;阵风因子随平均风速减小,湍流积分尺度则随之增大;相对于其他风速谱,Davenport谱更能准确描述强风风场的能量分布。

Abstract

The turbulent characteristics of nonstationary strong wind are analyzed based on field measured wind records of 1128-h long, collected at a height of 10 meters over an open flat terrain. According to the assumption that the average wind speed component was deterministic time-varying in a time interval, a nonstationary wind model was proposed and then applied to find its turbulent characteristics. The results were compared with those calculated by a stationary wind model, in which the average wind speed component was assumed constant. It is found that 55% samples of wind records are nonstationary, and the nonstationary wind model is more appropriate for charactering wind speed. The variations of turbulent characteristics for wind speed were studied, and it shows that the turbulent intensity seems to have no significant relationship with wind speed and mainly distributes within 0.16~0.20, a value slightly greater than that given in wind load codes; the gust factor decreases while wind speed increases, the turbulent integral scale the opposite; Davenport spectrum tends to be more accurate to characterize the energy distribution than other wind spectra.

关键词

风速实测 / 经验模态分解 / 风速模型 / 非平稳性 / 湍流特征

Key words

field measurements / empirical mode decomposition / wind speed models / non-stationarity / turbulent characteristics

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张少锋 ;楼文娟;吕中宾;段志勇;黄铭枫. 空旷平坦地面非平稳强风湍流特性研究[J]. 振动与冲击, 2014, 33(23): 68-73
ZHANG Shao-feng;LOU Wen-juan;LV Zhong-binDUAN Zhi-yong;HUANG Ming-feng. Analysis on nonstationary strong wind characteristics over an open flat terrain[J]. Journal of Vibration and Shock, 2014, 33(23): 68-73

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