大跨度公铁两用双层钢桁梁涡激振动控制研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (5) : 12-19.

论文

陈天瑀1,2,马存明1,2,段青松3,向鸿鑫1,2

作者信息 +

VIV control of a large-span dual-layer steel truss beam bridge for highway and railway dual-purpose

CHEN Tianyu1,2,MA Cunming1,2,DUAN Qingsong3,XIANG Hongxin1,2

Author information +

文章历史 +

摘要

桥梁的涡激振动主要受到主梁断面的气动外形、结构动力特性与来流特性的影响，而大跨桥梁是典型的风致敏感结构，所以在大跨度桥梁的设计中应当引起重视。本文以某大跨度公铁两用双层板桁组合桁架桥为背景，在XNJD-1回流串联风洞中进行了风洞试验，研究了该主梁的涡激振动现象。之后通过CFD数值模拟分析了其主梁断面的涡激振动机理，并且将展向周期摄动法应用于钢桁梁的涡激振动控制，采取了一系列气动控制措施来抑制主梁的涡激振动，其中L型分流板与波浪形风嘴完全抑制了主梁的涡激振动。本文还通过风洞试验研究了波浪形风嘴的几何参数对抑振效果的影响，试验结果表明波浪形风嘴的抑振效果对幅值变化比较敏感，增大幅值可以有效抑制主梁的涡激振动。

Abstract

The vortex-induced vibration of the bridge is mainly affected by the aerodynamic shape, structural dynamic characteristics and flow characteristics of the beam section. The long-span bridge is a typical wind-induced sensitive structure, so it should be treated carefully in the design. This paper studies the vortex-induced vibration performance a long-span combined highway and railway truss bridge which contains two separated decks. The vortex-induced vibration of the girder was studied by wind tunnel experiment in XNJD-1 reflux series wind tunnel. Computational fluid dynamics (CFD) simulations were carried out, and a series of aerodynamic control measures were adopted to suppress the VIV of the truss girder. The spanwise periodic perturbation method is introduced into the VIV control of the truss girder. And the effect of the L-shaped baffle and the wavy wind fairing on the VIV is verified. Finally, the influence of the geometric parameters of the wavy wind fairing on mitigating VIV were investigated through wind tunnel experiments. The results show that the suppression effect of the wavy wind fairing is sensitive to the amplitude, and increasing the amplitude can effectively suppress the VIV of the girder.

导出引用

陈天瑀1,2,马存明1,2,段青松3,向鸿鑫1,2. 大跨度公铁两用双层钢桁梁涡激振动控制研究[J]. 振动与冲击, 2024, 43(5): 12-19

CHEN Tianyu1,2,MA Cunming1,2,DUAN Qingsong3,XIANG Hongxin1,2. VIV control of a large-span dual-layer steel truss beam bridge for highway and railway dual-purpose[J]. Journal of Vibration and Shock, 2024, 43(5): 12-19

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