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| Evolutionary-phase-spectrum based simulation of fluctuating wind speed |
| YAN Qi1; LI Jie1,2 |
| 1. Department of Building Engineering, Tongji University, Shanghai 200092, China;2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China |
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Abstract Based on rational analysis, an evolutionary -phase-spectrum model which can be used in fluctuating wind speed simulation is proposed. According to the characteristic speed of eddies with different frequencies in turbulence, the concept of phase-evolving speed is put forward. Afterwards, it is illustrated that real wind speed history could be regarded as the evolutionary results of eddies with initial phases of zero after a evolutionary time . The probability distribution of is presented through statistics of the identified value from measured fluctuating wind speed histories. Then, it is easy to get samples of evolutionary -phase-spectrum. Combined with Fourier amplitude spectrum, fluctuating wind speed could be obtained through inverse Fourier transform. The evolutionary -phase-spectrum model is a rational description of Fourier phase spectrum and is recommended to be used in wind load simulation in wind-resistance calculation and reliability analysis of structures.
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Received: 01 January 1900
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Corresponding Authors:
YAN Qi
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2011, Vol. 30 
