Nonstationary wind characteristics analysis of wind-rain induced vibration of stay cable
HE Xu-hui1; CHEN Zheng-qing2; LI Chun-guang1,2; FANG Jun1
1. School of Civil Engineering, Central South University, Changsha 410075,China;2. Wind Engineering Experiment Research Center, Hunan University, Changsha 410082, China
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.
2011, Vol. 30 
