屋盖结构脉动风压非高斯特性分析的极限流线方法

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (8) : 157-162.

论文

孙旭峰1, T. Bitsuamlak2, 胡超1

作者信息 +

A study on the application of limiting streamline on the analysis of non-Gaussian property of the fluctuating wind pressure for roof structures

T. Bitsuamlak2 HU Chao1

Author information +

文章历史 +

摘要

非高斯脉动风压对围护结构及局部结构构件有较大影响，在设计中应引起足够重视。目前，非高斯风压场的分区研究主要是建立在对实验数据的统计量分析基础上，并非普遍适用，且随机性较强，区内统计特征值亦相差很大，不足以显示不同区域的非高斯程度，故须结合其形成机理加以分析。考虑到在特定风场条件下分离流动及旋涡作用范围具有时均定常的特点，利用稳态数值方法求解的极限流线和粘性流动分离理论的基本结论，结合实验结果分析了典型屋盖结构脉动风压非高斯特性的形成和分布机理。结果表明，极限流线的分布形态与实验统计的偏度及峰态值分布高度相关，可以被很好地应用于风压场非高斯特性的生成及分布机理研究。

Abstract

The non-Gaussian fluctuating wind pressure greatly affects the building envelope and some local structural elements, it should be paid attention in the design. Currently, the identification of the non-Gaussian wind pressure field is mainly based on the statistical analysis of the measurement data, but it can not find its application universally. Besides, the method is highly random and the characteristic values in the non-Gaussian area are totally different, so it can not show the non-Gaussian distribution extent in different areas, to overcome it the mechanism of non-Gaussian property should also be considered. Considering that under certain wind field, it is time-averaged stationary for the flow separation and the vortex action sphere, the limiting streamline solved by steady CFD and the basic conclusions of viscous flow separation theory are used here, combined with the experimental results, to analyze the mechanism of formation and distribution of the non-Gaussian properties for typical roof structures. The results show that the distribution pattern of the limiting streamline is highly relevant to the distribution of skewness and kurtosis calculated from the experimental results, which can be reasonably applied on the analysis of the formation and distribution mechanism of the non-Gaussian properties.

导出引用

孙旭峰1, T. Bitsuamlak2, 胡超1. 屋盖结构脉动风压非高斯特性分析的极限流线方法[J]. 振动与冲击, 2015, 34(8): 157-162

T. Bitsuamlak2 HU Chao1. A study on the application of limiting streamline on the analysis of non-Gaussian property of the fluctuating wind pressure for roof structures[J]. Journal of Vibration and Shock, 2015, 34(8): 157-162

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