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Wind and Structures Volume 37, Number 3, September 2023 , pages 211-227 DOI: https://doi.org/10.12989/was.2023.37.3.211 |
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Non-Gaussian feature of fluctuating wind pressures on rectangular high-rise buildings with different side ratios |
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Jia-hui Yuan, Shui-fu Chen and Yi Liu
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| Abstract | ||
| To investigate the non-Gaussian feature of fluctuating wind pressures on rectangular high-rise buildings, wind tunnel tests were conducted on scale models with side ratios ranging from 1/9~9 in an open exposure for various wind directions. The high-order statistical moments, time histories, probability density distributions, and peak factors of pressure fluctuations are analyzed. The mixed normal-Weibull distribution, Gumbel-Weibull distribution, and lognormal-Weibull distribution are adopted to fit the probability density distribution of different non-Gaussian wind pressures. Zones of Gaussian and non-Gaussian are classified for rectangular buildings with various side ratios. The results indicate that on the side wall, the non-Gaussian wind pressures are related to the distance from the leading edge. Apart from the non-Gaussianity in the separated flow regions noted by some literature, wind pressures behind the area where reattachment happens present non-Gaussian nature as well. There is a new probability density distribution type of non-Gaussian wind pressure which has both long positive and negative tail found behind the reattachment regions. The correlation coefficient of wind pressures is proved to reflect the nonGaussianity and a new method to estimate the mean reattachment length of rectangular high-rise building side wall is proposed by evaluating the correlation coefficient. For rectangular high-rise buildings, the mean reattachment length calculated by the correlation coefficient method along the height changes in a parabolic shape. Distributions of Gaussian and non-Gaussian wind pressures vary with side ratios. It is inappropriate to estimate the extreme loads of wind pressures using a fixed peak factor. The trend of the peak factor with side ratios on different walls is given. | ||
| Key Words | ||
| non-Gaussian feature; peak factor; probability density distribution; rectangular high-rise buildings; side ratio; wind tunnel test | ||
| Address | ||
| Jia-hui Yuan, Shui-fu Chen and Yi Liu:Institute of Structural Engineering, Zhejiang University, Hangzhou, China | ||