斜拉索风雨振非平稳风场特性分析

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (10) : 54-60.

论文

斜拉索风雨振非平稳风场特性分析

何旭辉1; 陈政清2; 李春光1,2; 方俊1

作者信息 +

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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文章历史 +

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。

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.

导出引用

何旭辉;陈政清;李春光;方俊. 斜拉索风雨振非平稳风场特性分析[J]. 振动与冲击, 2011, 30(10): 54-60

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