复杂曲面屋盖脉动风压的非高斯特性及峰值因子研究

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摘要

以某大跨复杂曲面屋盖为研究对象，通过刚体模型风洞测压试验，研究表面脉动风压的概率分布规律和非高斯特性，分析形成非高斯分布的流动机理，并分别基于脉动风压空间相关性、峰度和偏度的累积概率，提出了高斯分布和非高斯分布的划分标准；在此基础上，采用Hermite矩模型构建非高斯分布与峰值因子间的联系。结果表明：屋盖迎风侧边缘和曲面拐角的表面脉动风压概率分布相较于标准高斯出现严重的偏离和凸起，呈现显著的非高斯分布特性，其原因在于上述区域的流动分离明显，其风压分布受分离涡影响而呈现较强的空间相关性，不满足独立同分布条件；以脉动风压空间相关性作为划分高斯与非高斯区域的标准更加合理，且物理意义较为明确。此外，还给出了此类复杂曲面屋盖非高斯区域风荷载峰值因子的取值范围。

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	杨雄伟
	周强
	李明水
	王沛源

关键词 ：复杂曲面屋盖, 非高斯特性, 概率分布, 相关系数, 峰值因子

Abstract：The synchronized pressure tests on the rigid model of complex curved roof were conducted in wind tunnel in order to investigate the probability distribution and non-Gaussian features of fluctuating wind pressures, as well as their flow mechanism.Then the regions of Gaussian distribution and non-Gaussian distribution on the roof were divided by two criteria based on the cumulative probabilities of kurtosis and skewness and spatial correlation of wind pressures proposed for the first time, respectively.The relationship between non-Gaussian distribution and peak factor was expressed by the Hermite moment model, and thus the non-Gaussian peak factors were obtained.The results show that probability distributions of fluctuating pressures within the vicinity of the windward-side edge, which appear serious deviation and bulge compared with those of standard Gaussian distribution, present typical non-Gaussian characteristics.This is due to that the flow separation occurred in the above-mentioned region, wherefore the fluctuating pressure distribution was strongly spatially dependent on the separation vortices which does not satisfy the independent distribution; It is more reasonable to use the spatial correlation of fluctuating wind pressure as the standard to divide the Gaussian and non-Gaussian region, and it has clear physical significance.In addition, the range of wind load peak factor in non-Gaussian region of this kind of complex curved roof is given.

Key words： complex curved roof non-Gaussian features probability distribution correlation coefficient peak factor

收稿日期: 2020-07-23 出版日期: 2021-05-28

引用本文:

杨雄伟，周强，李明水，王沛源. 复杂曲面屋盖脉动风压的非高斯特性及峰值因子研究[J]. 振动与冲击, 2021, 40(10): 315-322.
YANG Xiongwei, ZHOU Qiang, LI Mingshui, WANG Peiyuan. Non-Gaussian features and peak factors of fluctuating wind pressures on a complex curved roof. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(10): 315-322.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I10/315

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