Non-Gaussian characteristics of the wind pressure on a roof with irregular shape

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 123-130.

XIA Yuchao，CHEN Shuifu

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Abstract

The rigid model wind tunnel experiments on an open-type roof with irregular shape were conducted.The mean wind-pressure coefficients,fluctuating wind-pressure coefficients,skewness and kurtosis were analyzed.The lognormal-Weibull mixture distribution model,lognormal-lognormal mixture distribution model and Weibull-Weibull mixture distribution model were adopted to fit the probability distribution of pressure coefficient time series of the taps.The data analysis shows that the maximum negative pressures appear on the eaves,and corners of the roof on the windward.What’s more,several extreme value areas are arranged in a line on the bulge part of the roof due to its irregular shape.The wind pressure in different parts of the roof presents different degrees of non-Gaussian properties and it shows strong non-Gaussian property when the taps are in flow separation regions.The three mixture models show some difference in the fitting results.The lognormal-Weibull mixture distribution model is appropriate for fitting the probability distribution of pressure coefficients with various skewness.

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roof with irregular shape / wind pressure coefficients / probability distribution / mixture model / non-Gaussian characteristics

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XIA Yuchao，CHEN Shuifu. Non-Gaussian characteristics of the wind pressure on a roof with irregular shape[J]. Journal of Vibration and Shock, 2019, 38(2): 123-130

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