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A deterministic-stochastic hybrid model of downbursts and its impact on a cantilevered structure
Citation
Chen, L and Letchford, CW, A deterministic-stochastic hybrid model of downbursts and its impact on a cantilevered structure, Engineering Structures, 26, (5) pp. 619-629. ISSN 0141-0296 (2004) [Refereed Article]
DOI: doi:10.1016/j.engstruct.2003.12.009
Abstract
Thunderstorm downbursts, which are sources of extreme wind loadings in nature, have caused numerous structural failures around the world. It is essential to build some applicable, though approximate, model for these loadings under which structures can be assessed. In this paper, a deterministic-stochastic hybrid model of downbursts is presented. In this model, downburst winds are the summation of a deterministic mean and a stochastic fluctuation. Wood's velocity profile for the vertical profile and Holmes' empirical model for the time function are utilized to model the mean wind. The fluctuation is modeled as a uniformly modulated evolutionary vector stochastic process. Time histories of downburst wind speeds over slender structures, such as tall buildings, can be simulated by the spectral representation method. Using the simulated downbursts as input, the dynamic responses of structures are obtained in the time domain. As a numerical example, the dynamic response of a cantilevered structure to simulated downbursts is computed and their sensitivity to the coherence function is discussed. © 2003 Elsevier Ltd. All rights reserved.
Item Details
Item Type: | Refereed Article |
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Research Division: | Engineering |
Research Group: | Fluid mechanics and thermal engineering |
Research Field: | Turbulent flows |
Objective Division: | Construction |
Objective Group: | Construction planning |
Objective Field: | Civil construction planning |
UTAS Author: | Letchford, CW (Professor Chris Letchford) |
ID Code: | 47442 |
Year Published: | 2004 |
Web of Science® Times Cited: | 109 |
Deposited By: | Engineering |
Deposited On: | 2007-09-15 |
Last Modified: | 2007-09-15 |
Downloads: | 0 |
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