Vortex induced vibration control of split twin-box girder with grilles on both sides of opened slot

被引：0
|
作者：
Duan, Qingsong [1 ]
Ma, Cunming [2 ,3 ]
Xu, Zhao [4 ]
机构：
[1] School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang
[2] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[3] Wind Engineering Key Lahoratory of Sichuan Province, Chengdu
[4] Shandong Provincial Communciations Planning and Design Institute Group Co., Ltd., Jinan
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 21期
关键词：
flow structure; grille; split twin-box girder; vortex-induced vibration; wind tunnel test;
D O I：
10.13465/j.cnki.jvs.2024.21.007
中图分类号：
学科分类号：
摘要：
Vortex induced vibration (VIV) performance and optimization of split twin-box girder section are one of key problems faced by anti-wind design of long-span bridges. Here, taking a large-span suspension bridge as the background, wind tunnel tests were conducted for a segmented model of split twin-box girder to analyze VIV performance of its main beam under different attack angles. An optimization scheme was proposed to symmetrically arrange aerodynamic grilles along main beam longitudinal direction on both sides of opened slot to study effects of grilles' ventilation rate on VIV performance of main beam. The results showed that when damping ratio is 0.25% and attack angles are -3°, 0° and +3 °, dimensionless maximum amplitudes of VIV of main beam are 0.032, 0.033 and 0.023, respectively; when attack angles are 0° and -3°, maximum amplitudes of torsional VIV of main beam are 0. 18° and 0. 13°, respectively; after arranging grilles with ventilation rate of 50% on slot both sides, vertical VIV of main beam disappears, it is because airflow separates at leading edge of windward side of upstream section and railing to generate larger upper vortices; with vortices continuously moving, they collide with downstream section, main beam wake generates alternating shedding vortices to induce VIV of split twin-box girder section; after arranging grilles on slot both sides, the separation action of airflow is weakened, and vortex sizes at slot position obviously decrease to weaken their action on downstream section and optimize VIV performance of main beam; the study can provide a reference for anti-wind design of bridges with split twin-box girder section. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：64 / 70and95
页数：7031
相关论文
共 19 条
  • [1] KWOK K C S, QIN X R, FOK C H, Et al., Wind-induced pressures around a sectional twin-deck bridge model: effects of gap-width on the aerodynamic forces and vortex shedding mechanisms, Journal of Wind Engineering and Industrial Aerodynamics, 110, pp. 50-61, (2010)
  • [2] LI H, LAIMA S J, OU J P, Et al., Investigation of vortex-induced vibration of a suspension bridge with two separated steel box girders based on field measurements, Engineering Structures, 33, 6, pp. 1894-1907, (2011)
  • [3] LAIMA S J, LI H, CHEN W L, Et al., Investigation and control of vortex-induced vibration of twin box girders, Journal of Fluids and Structures, 39, pp. 205-221, (2013)
  • [4] LAIMA S J, LI H., Effects of gap width on flow motions around twin-box girder and vortex-induced vibrations, Journal of Wind Engineering and Industrial Aerodynamics, 139, pp. 37-49, (2015)
  • [5] LAIMA S J, LI H, CHEN W L., Effects of attachments on aerodynamic characteristics and vortex-induced vibration of twin-box girder, Journal of Fluids and Structures, 77, pp. 115-133, (2018)
  • [6] WU B C, LAIMA S J., Experimental study on characteristics of vortex-induced vibration of a twin-box girder and damping effects, Journal of Wind Engineering and Industrial Aerodynamics, 103, pp. 1-14, (2021)
  • [7] YANG Yongxin, ZHOU Rui, LUO Dongwei, Et al., Vortex-induced vibration and its control for twin box girder and damping effects, Engineering Mechanics, 34, 7, pp. 30-40, (2017)
  • [8] YANG Yongxin, ZHOU Rui, GE Yaojun, Vortex-induced vibration and its control for long-span bridges with twin-box girder, China Civil Engineering of Journal, 47, 12, pp. 107-114, (2014)
  • [9] YANG Y X, ZHOU R, GE Y J, Et al., Experimental studies on VIV performance and countermeasures for twin-box girder bridges with various slot width ratios, Journal of Fluids and Structures, 66, (2016)
  • [10] ZHOU R, YANG Y X, GE Y J, Et al., Comprehensive evaluation of aerodynamic of twin-box girder bridges with vertical stabilizers, Journal of Wind Engineering and Industrial Aerodynamics, 175, pp. 317-327, (2018)
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