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Wind and Structures Volume 18, Number 6, June 2014 , pages 633-650 DOI: https://doi.org/10.12989/was.2014.18.6.633 |
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Investigations on coefficient of variation of extreme wind speed |
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Fuyou Xu, Chunsheng Cai and Zhe Zhang
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| Abstract | ||
| The uncertainty of extreme wind speeds is one key contributor to the uncertainty of wind loads and their effects on structures. The probability distribution of annual extreme wind speeds may be characterized using a classical Gumbel Type distribution. The expression that establishes the relationship between the extreme wind speeds at different recurrence periods and the corresponding coefficients of variation is formulated, and its efficacy is validated. The coefficients of variation are calibrated to be about 0.125 and 0.184 according to defined Chinese and US design specifications, respectively. Based on the wind data of 54 cities in China, 49 meteorological stations in the US, 3 stations in Singapore, the coefficients span intervals of (0.1, 0.35), (0.08, 0.20) and (0.06, 0.14), respectively. For hurricanes in the US, the coefficients range approximately from 0.3 to 0.4. This convenient technique is recommended as one alternative tool for coefficient of variation analyses in the future revisions of related codes. The sensitivities of coefficients of variation for 49 meteorological stations in the US are quantified and demonstrated. Some contradictions and incompatibilities can be clearly detected and illustrated by comparing the coefficients of variation obtained with different combinations of recurrence period wind data. | ||
| Key Words | ||
| extreme wind speed; coefficient of variation; recurrence coefficient; sensitivity analysis; design code | ||
| Address | ||
| Fuyou Xu and Zhe Zhang: School of Civil Engineering, Dalian University of Technology, Dalian 116024, China Chunsheng Cai: Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge 70803, USA | ||