护栏位置对流线型箱梁涡激振动的影响及作用机理

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (6) : 1-7.

论文

李震1，刘庆宽1,2,3，靖洪淼1,2,3，孙一飞1，王仰雪1

作者信息 +

Effect on vortex induced vibration of the guardrails’ locations of a streamline box girder and the driving mechanism

LI Zhen1，LIU Qingkuan1,2,3，JING Hongmiao1,2,3，SUN Yifei1，WANG Yangxue1

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摘要

涡激振动是大跨度桥梁常发生的一种振动，易造成结构疲劳破坏，掌握主梁外形对涡激振动的影响十分必要。为了研究不同位置桥侧护栏对闭口流线型箱梁涡激振动特性的影响及作用机理，通过节段模型风洞试验，分别研究了桥侧护栏位置下主梁的涡激振动响应、风压分布、升力系数、气动力相位差及涡激振动贡献系数。研究结果表明：迎风侧护栏内移有利于抑制竖弯涡振，但背风侧护栏内移会略微增大涡振响应。迎风侧护栏内移会降低主梁升力绝对值，增加气动力相位的差离散性，也降低各位置的涡振贡献系数，这被认为是涡激振动被抑制的原因。

Abstract

Vortex induced vibration （VIV） is easy to occur in long-span bridges, resulting in structural fatigue damage. It is necessary to grasp the influence of girder shape on VIV. To investigate the influence and mechanism of guardrail with different locations on VIV characteristics of streamlined box girder, the vortex induced vibration response, wind pressure distribution, lift coefficient, aerodynamic phase difference and vortex induced vibration contribution coefficient of bridge side railings at five locations were studied through segmental model wind tunnel test. The experimental results show that the inward movement of the railing on the windward side is beneficial to suppress the vertical bending vortex vibration, and the inward movement of the railing on the leeward side will slightly increase the vortex vibration response. The inward movement of the railing on the windward side will reduce the absolute value of the lift of the main beam, increase the dispersion of aerodynamic phase difference, and also reduce the contribution coefficient of vortex induced vibration at each position, which is considered to be the reason for the suppression of VIV.

Key words

vortex induced vibration / guardrail location / wind tunnel test / aerodynamic phase difference / contribution coefficient of vortex vibration

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李震1，刘庆宽1,2,3，靖洪淼1,2,3，孙一飞1，王仰雪1. 护栏位置对流线型箱梁涡激振动的影响及作用机理[J]. 振动与冲击, 2023, 42(6): 1-7

LI Zhen1，LIU Qingkuan1,2,3，JING Hongmiao1,2,3，SUN Yifei1，WANG Yangxue1. Effect on vortex induced vibration of the guardrails’ locations of a streamline box girder and the driving mechanism[J]. Journal of Vibration and Shock, 2023, 42(6): 1-7

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