Extreme wind pressure analysis for large-span flat roof under downburst

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (11) : 83-89.

WANG Zhisong1,2, XIANG Ming1, JIANG Shuiling1, TANG Yanghong1

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Abstract

In the downburst wind field, the wind pressure at the top of the large-span flat roof building in the separation zone of the incoming flow and the wake area is extremely non-Gaussian. Based on the results of the rigid pressure test of large-span flat roof buildings under the action of steady-state impinging jets, the high-order statistics method was adapted to study the Gaussian and non-Gaussian partition characteristics of roof wind pressure at typical radial distances. The peak value of the measured points is calculated by the TPP method. It found that the extreme wind pressure coefficient of the measuring point on the flat roof surface is closely related to the distance between the building and the downburst vent. The results show that under the action of downburst, there are obvious non-Gaussian characteristics of wind pressure in some areas of the long-span flat roof, especially in the windward and leeward edge areas, and the peak factors of the Gaussian distribution of wind pressure and the edge of the side wind surface of the roof structure are relatively small. The range of the roof peak factor is between 3.99 and 9.29, and the peak factor of the measuring point is obviously larger than that in the load Code for Building structures. At different radial distances, the extreme wind pressure coefficients are negative, and the absolute values of the wind pressure coefficients in the incoming flow separation region and wake region are larger. The absolute value of the minimum wind pressure coefficient first increases and then decreases with the increase of the radial distance, and the absolute value of the minimum wind pressure coefficient reaches the maximum when the radial distance is 1.25Djet.

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Impinging jet / large-span flat roof structure / non-Gaussian / peak factor / extreme wind pressure coefficient

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WANG Zhisong1,2, XIANG Ming1, JIANG Shuiling1, TANG Yanghong1. Extreme wind pressure analysis for large-span flat roof under downburst[J]. Journal of Vibration and Shock, 2022, 41(11): 83-89

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