大跨度悬索桥吊索风致振动多重调谐阻尼减振技术研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (5) : 200-204.

论文

柴小鹏1,2，荆国强1,2，吴肖波1,2

作者信息 +

Multiple tuned damping technology for suspension cable WIV of long-span suspension bridge

CHAI Xiaopeng1,2, JING Guoqiang1,2, WU Xiaobo1,2

Author information +

文章历史 +

摘要

为了控制大跨度悬索桥的吊索风致振动，提出了基于多重调谐质量阻尼器的阻尼减振技术方案，并通过理论分析进行参数优化和设计。研究南沙大桥两座主航道悬索桥吊索实际风致振动响应，分析其频谱特征和振动特性，确定振动控制的目标；建立吊索-MTMD分析模型，优化适用于吊索多模态控制的MTMD阻尼比、频率分布、安装位置、模态参与系数等参数，结果表明：不同于单一频率控制时的优化理论，用于吊索多模态控制的MTMD阻尼比提高为10%，扩展其振动控制的频率范围；通过考虑振型参与系数，优选4个分布主频：13.5Hz和18Hz安装在位置比为2.9%处，6.5Hz和9.5Hz安装在位置比为6.5%处，实现对吊索5~20Hz风致振动的多模态控制；不同吊索在索力、型号和受控频率范围内，MTMD的设计参数可以采取统一设计方案。

Abstract

In order to control the wind-induced vibration for hanger cables of long-span suspension bridges, a damping technical scheme based on multiple tuned mass dampers (MTMD) is proposed, and the parameters are optimized and designed through theoretical analysis. Study the actual wind-induced vibration responses for hanger cables of Nansha Bridge two main channel suspension bridges, analysis the frequencies and vibration characteristics, proposes the vibration control target. The cable-MTMD analysis model is established to optimize the parameters such as frequency distribution, damping ratio, installation position and modal participation coefficient of MTMD in multi-mode vibration control of hanger cable. The results show that, different from the optimization theory of single frequency control, the MTMD damping ratio for multi-mode control of hanger cables is increased to 10%, extend the frequency coverage of vibration control. By considering the modal participation coefficient，optimize four main frequencies: 13.5Hz and 18Hz are installed at a position ratio of 2.9%, and 6.5Hz and 9.5Hz are installed at a position ratio of 6.5%, realize the cable’s multi-mode (5~20Hz) wind-induced vibration control; for the different lengths cables with the similar cable force, type and controlled frequency ranges, the MTMD’s design parameters can be designed uniformly.

导出引用

柴小鹏1,2，荆国强1,2，吴肖波1,2. 大跨度悬索桥吊索风致振动多重调谐阻尼减振技术研究[J]. 振动与冲击, 2023, 42(5): 200-204

CHAI Xiaopeng1,2, JING Guoqiang1,2, WU Xiaobo1,2. Multiple tuned damping technology for suspension cable WIV of long-span suspension bridge[J]. Journal of Vibration and Shock, 2023, 42(5): 200-204

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