Probability characteristics and extreme POT estimation of wind pressure coefficient of high-rise building envelope

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (1) : 224-231.

LI Shouke1, MAO Dan1, LIU Min1, GUO Fan1, SUN Hongxin1, CHEN Yuankun2, DENG Shengxiang3

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Abstract

As determining the design wind loads of facades of high-rise buildings, the probability characteristics of pressure coefficients should be taken account into the estimation of extreme pressure coefficients. For overcome the deficiency of hardness for determining the threshold in the POT (Peak over threshold) method for extreme estimation, the wind tunnel tests of CAARC building were conducted in wind tunnel. Firstly, the probability characteristics of pressure coefficients are specially studied, and it is shown that Gaussian distribution is good for the pressure coefficient in the upwind region, as well as the Gamma distribution is good for the pressure coefficient in the leeward region, the GEV (Generalized Extreme Value) distribution is good for the minimum pressure coefficient in the upwind region. Secondly, a modified POT method is proposed to estimate the extreme of pressure coefficients, it is indicated that the modified POT method is more accurate and more stable than the other extreme method. The bias between modified POT method and standard extreme is lower than 5% with 5 time-history samples. At last, the distributions of extreme pressure coefficients are given out for designing.

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LI Shouke1, MAO Dan1, LIU Min1, GUO Fan1, SUN Hongxin1, CHEN Yuankun2, DENG Shengxiang3. Probability characteristics and extreme POT estimation of wind pressure coefficient of high-rise building envelope[J]. Journal of Vibration and Shock, 2023, 42(1): 224-231

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