Vortex-induced vibration mitigation of long-span bridges with rotational damping: concept and design of damped outriggers

被引：0
|
作者：
Chen, Lin [1 ,2 ,3 ]
Liu, Zhanhang [1 ]
Zhao, Lin [1 ,2 ]
Sun, Limin [1 ,2 ,3 ]
机构：
[1] College of Civil Engineering, Tongji University, Shanghai
[2] State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai
[3] Shanghai Qi Zhi Institute, Shanghai
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2024年 / 57卷 / 07期
关键词：
damped outriggers; damping ratio; long-span bridges; rotational damping; vibration control;
D O I：
10.15951/j.tmgcxb.23050326
中图分类号：
学科分类号：
摘要：
Long-span bridges are vulnerable to wind-induced vibrations due to their low-frequency and closely-spaced modes, small inherent damping, and the difficulty in damping improvement. The bridges can vibrate under low wind speed, in multiple modes, and for a long time, posing challenges in bridge design and operation. In this study, it is proposed to suppress vibrations of long-span bridges by supplementing rotational damping according to angular deflection of bridge girder. Furthermore, damped outriggers (DOs) are proposed to realize the concept. The multimode damping effects are first analyzed using a simplified tensioned beam model of a suspension bridge, considering main cable tension forces and girder bending stiffness of typical suspension bridges. It is found that one DO is capable of achieving a maximal modal damping of 0.8%. Influences of relative importance of girder bending stiffness to main cable tension, outrigger stiffness, and outrigger location on the damping effects are investigated. With the Xihoumen Bridge in Zhoushan city taken as a study case, a finite element model (FEM) of the bridge with viscous DOs is established. Complex eigenanalysis is performed to appreciate damping, and parametric study is conducted using the FEM. It is shown that damping ratios of 6 out of 7 modes of the bridge suffering from vortex-induced vibrations can reach 0.98% when one rigid DO is installed between one tower and the bridge girder. When two DOs are installed respectively between two towers and the bridge girder, the damping ratios of the 6 modes can be over 1.12%. It is suggested that to meet the requirements on the lateral stiffness of the outrigger at its lower end, the bending stiffness of outrigger shall be designed as twice the bending stiffness of girder in practical design. The results show that the proposed concept and the realization approach are effective for multimode vibration mitigation of long-span bridges. © 2024 Chinese Society of Civil Engineering. All rights reserved.
引用
收藏
页码：22 / 36
页数：14
相关论文
共 49 条
  • [1] Fujino Y, Siringoringo D., Vibration mechanisms and controls of long-span bridges: a review, Structural Engineering International, 23, 3, pp. 248-268, (2013)
  • [2] Ge Y J, Xia J L, Zhao L, Et al., Full aeroelastic model testing for examining wind-induced vibration of a 5, 000 m spanned suspension bridge, Frontiers in Built Environment, 4, (2018)
  • [3] Xiang Haifan, Ge Yaojun, Wind resistance challenges and fundamental research on long span bridges, Strategic Study of CAE, 13, 9, pp. 8-21, (2011)
  • [4] Wen Qing, Amplitude prediction of vortex-induced vibrations for high-order vertical modes of large-span flexible bridges, (2017)
  • [5] Ge Y J, Zhao L, Cao J X., Case study of vortex-induced vibration and mitigation mechanism for a long-span suspension bridge, Journal of Wind Engineering and Industrial Aerodynamics, 220, (2022)
  • [6] Zhao L, Cui W, Shen X M, Et al., A fast on-site measure-analyze-suppress response to control vortex-induced-vibration of a long-span bridge, Structures, 35, pp. 192-201, (2022)
  • [7] Li H, Laima S J, Zhang Q Q, Et al., Field monitoring and validation of vortex-induced vibrations of a long-span suspension bridge, Journal of Wind Engineering and Industrial Aerodynamics, 124, pp. 54-67, (2014)
  • [8] Zhu Q, Xu Y L, Zhu L D, Et al., Vortex-induced vibration analysis of long-span bridges with twin-box decks under non-uniformly distributed turbulent winds, Journal of Wind Engineering and Industrial Aerodynamics, 172, pp. 31-41, (2018)
  • [9] Hwang Y C, Kim S, Kim H K., Cause investigation of high-mode vortex-induced vibration in a long-span suspension bridge, Structure and Infrastructure Engineering, 16, 1, pp. 84-93, (2020)
  • [10] Zhao H W, Ding Y L, Li A Q, Et al., Evaluation and early warning of vortex-induced vibration of existed long-span suspension bridge using multisource monitoring data [J], Journal of Performance of Constructed Facilities, 35, 3, (2021)
12345