Nonstationary wind characteristics analysis of wind-rain induced vibration of stay cable

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (10) : 54-60.

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Nonstationary wind characteristics analysis of wind-rain induced vibration of stay cable

HE Xu-hui1; CHEN Zheng-qing2; LI Chun-guang1,2; FANG Jun1

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Abstract

The time-varying mean values of measured wind speed, wind direction signals of wind-rain induced vibration are extracted, and the nonstationary wind speed model based on wavelet analysis is proposed. By using the field measured wind speed data of wind-rain induced vibration on the Dongting Lake Bridge on April, 2003, the wind characteristics of turbulence intensity, integral scale, wind spectra and probability distributions are calculated. The calculated results are compared with those obtained by the nonstationary wind speed model based on empirical mode decomposition (EMD) and traditional stationary wind speed model. The compared results indicate that the wavelet-based nonstationary wind speed model is more reasonable in nonstationarity analysis of wind-rain induced vibration. At the same time, the correlation between the tower and deck longitudinal fluctuating wind speed component based on the Davenport correlation function is also discussed.

Key words

bridge engineering / stay cable / wind-rain induced vibration / nonstationarity / wavelet analysis / correlation

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HE Xu-hui;CHEN Zheng-qing;LI Chun-guang;FANG Jun. Nonstationary wind characteristics analysis of wind-rain induced vibration of stay cable[J]. Journal of Vibration and Shock, 2011, 30(10): 54-60