Journal
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
Volume 102, Issue -, Pages 1-13Publisher
ELSEVIER
DOI: 10.1016/j.jweia.2011.12.003
Keywords
Peak factor; Gust factor; Hurricane; Non-Gaussian
Categories
Funding
- National Science Foundation [CMMI-0928563]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0928563] Funding Source: National Science Foundation
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The peak factor is a critical parameter in estimating short duration peak gust speeds. An analysis of sixty-four 10 m wind field records measured during the 1999-2008 Atlantic hurricane seasons shows a mildly positive non-Gaussian trend in the skewness of velocity with increasing longitudinal turbulence intensity (I-u). Kurtosis values exhibit slightly platykurtic behavior (kurtosis values less than 3) in open exposure but trend toward Gaussian as I-u increases. Average peak factors are computed from the data, stratified by wind speed and turbulence regime. Gust factor models are also examined; differences between the theoretical and observed zero up-crossing rates and power spectral density functions are used to discuss uncertainty propagation in the model. The results indicate that a non-Gaussian peak factor in theoretical peak gust (or gust factor) calculation appears to be warranted. Additional field measurements in built-up terrain are required to validate this finding. Published by Elsevier Ltd.
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