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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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

Received: 23 July 2020 Published: 28 May 2021

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	Articles by authors
	YANG Xiongwei
	ZHOU Qiang
	LI Mingshui
	WANG Peiyuan

Cite this article:

YANG Xiongwei,ZHOU Qiang,LI Mingshui, et al. Non-Gaussian features and peak factors of fluctuating wind pressures on a complex curved roof[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(10): 315-322.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I10/315

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