某大跨悬索桥风振响应的现场实测与理论对比分析

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (11) : 149-154.

论文

某大跨悬索桥风振响应的现场实测与理论对比分析

胡俊1,2，欧进萍3

作者信息 +

Field measurement and theoretical comparisons of a long-span suspension bridge’s wind-induced vibration responses

HU Jun1，2, OU Jinping3

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文章历史 +

摘要

结合东海某大跨悬索桥的健康监测系统，同步实测了桥面处的风速以及加劲梁和吊索的风振加速度响应，采用统计方法及频谱分析对结构响应的长期实测数据进行了分析，探讨了结构构件风振响应的实际特性；同时将强风作用下加劲梁响应的实测值与抖振分析的理论结果进行了对比研究。结果表明，加劲梁的RMS响应与垂直桥面平均风速基本呈线性关系，加劲梁的响应以低频为主，其动力特性随风速的增大变化不大；吊索的振动主要是高频的涡激振动，同时迎风侧的吊索响应要明显高于背风侧吊索响应；由于大跨度悬索桥抖振响应计算和实测过程受大量复杂和不确定因素的影响，理论分析结果要明显大于实测值。

Abstract

Based on the structural health monitoring system installed on a long-span suspension bridge, the simultaneous wind speeds at bridge deck and wind-induced acceleration responses of stiffening girder and hangers were recorded. The actual characteristics of wind-induced vibrations and the comparisons of the theoretical results with the measured responses were discussed. The results indicate that the RMS of acceleration responses of stiffening girder have a linear relationship with the average wind speeds vertical to the bridge deck, and the dynamic characteristics are stable with the wind speed increases; the dynamic response of hanger under wind is a high frequency resonance vibration and the resonance frequency increases with the wind speed increases; the buffeting responses of theoretical analysis are significantly greater than the measured values, the buffeting analysis still need more refinement.

导出引用

胡俊;欧进萍. 某大跨悬索桥风振响应的现场实测与理论对比分析[J]. 振动与冲击, 2013, 32(11): 149-154

HU Jun;OU Jinping. Field measurement and theoretical comparisons of a long-span suspension bridge’s wind-induced vibration responses[J]. Journal of Vibration and Shock, 2013, 32(11): 149-154