Wind and Structures

Techno-Press (테크노프레스)
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Non-Gaussian features of dynamic wind loads on a long-span roof in boundary layer turbulences with different integral-scales

  • Yang, Xiongwei (Research Centre for Wind Engineering, Southwest Jiaotong University) ;
  • Zhou, Qiang (Research Centre for Wind Engineering, Southwest Jiaotong University) ;
  • Lei, Yongfu (Research Centre for Wind Engineering, Southwest Jiaotong University) ;
  • Yang, Yang (Key Laboratory for Wind Engineering of Sichuan Province, Southwest Jiaotong University) ;
  • Li, Mingshui (Key Laboratory for Wind Engineering of Sichuan Province, Southwest Jiaotong University)
  • Received : 2021.12.12
  • Accepted : 2020.04.30
  • Published : 2022.05.25
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Abstract

To investigate the non-Gaussian properties of fluctuating wind pressures and the error margin of extreme wind loads on a long-span curved roof with matching and mismatching ratios of turbulence integral scales to depth (Lux/D), a series of synchronized pressure tests on the rigid model of the complex curved roof were conducted. The regions of Gaussian distribution and non-Gaussian distribution were identified by two criteria, which were based on the cumulative probabilities of higher-order statistical moments (skewness and kurtosis coefficients, Sk and Ku) and spatial correlation of fluctuating wind pressures, respectively. Then the characteristics of fluctuating wind-loads in the non-Gaussian region were analyzed in detail in order to understand the effects of turbulence integral-scale. Results showed that the fluctuating pressures with obvious negative-skewness appear in the area near the leading edge, which is categorized as the non-Gaussian region by both two identification criteria. Comparing with those in the wind field with matching Lux/D, the range of non-Gaussian region almost unchanged with a smaller Lux/D, while the non-Gaussian features become more evident, leading to higher values of Sk, Ku and peak factor. On contrary, the values of fluctuating pressures become lower in the wind field with a smaller Lux/D, eventually resulting in underestimation of extreme wind loads. Hence, the matching relationship of turbulence integral scale to depth should be carefully considered as estimating the extreme wind loads of long-span roof by wind tunnel tests.

Keywords

Acknowledgement

The research described in this paper was financially supported by the Fundamental Research Funds for Key Laboratory of Wind-Resistant Technology for Bridge Structures (NO. KLWRTBMC18-04), the Natural Science Foundation of China (Grant Nos. 52078437, 51878580 and 52008357) and Sichuan Province Science and Technology Program (No. 2021YJ0075).

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