【摘要】 基于小波多尺度分析,提取风雨振实测风速、风向的时变平均值,并建立非平稳风速模型。采用非平稳风速模型,分析了洞庭湖大桥2003年4月初风雨振时实测风速紊流强度、积分尺度、脉动风谱和概率密度等重要风场特性,并将结果与传统的平稳风速模型和基于EMD的非平稳风速模型进行比较,进一步验证采用基于小波分析的非平稳风速模型的合理性。同时,根据Davenport相干系数公式,计算了桥塔和桥面风速记录顺风向脉动风分量的相关性。更多还原

【Abstract】 Time-varying mean values of measured wind speed and wind direction for wind-rain induced vibration were extracted,and a nonstationary wind speed model based on wavelet analysis was proposed.By using the field measured wind speed data of wind-rain induced vibration on Dongting Lake Bridge in April 2003,the wind characteristics,such as,turbulence intensity,integral scale,wind spectra and probability distributions were calculated.The calculated results were compared with those obtained with the nonstationary wind speed model based on empirical mode decomposition(EMD) and the traditional stationary wind speed model.The comparison indicated that the wavelet-based nonstationary wind speed model is more reasonable for nonstationarity analysis of wind-rain induced vibration.At the same time,the correlation between the tower and deck longitudinal fluctuating wind speed components based on Davenport coherence function was also calculated.更多还原