Structural Engineering and Mechanics

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Vibration suppression analysis of a long-span cable-stayed bridge based on earthquake-wind-traffic-bridge coupled system

  • Xinfeng Yin (School of Civil Engineering, Changsha University of Science & Technology) ;
  • Yong Liu (School of Civil Engineering, Changsha University of Science & Technology) ;
  • Wanli Yan (School of Civil Engineering, Changsha University of Science & Technology) ;
  • Yang Liu (School of Civil Engineering, Changsha University of Science & Technology) ;
  • Zhou Huang (School of Civil Engineering, Changsha University of Science & Technology)
  • Received : 2023.01.20
  • Accepted : 2023.11.07
  • Published : 2023.11.25
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Abstract

Wind and earthquake loads may cause strong vibrations in large-span cable-stayed bridges, leading to the inability of the bridge to operate normally. An improved Pounding Tuned Mass Damper (PTMD) system was designed to improve the safety of the large-span cable-stayed bridge. The vibration control effect of the improved PTMD system on the large-span cablestayed bridge under the combined action of earthquake-wind-traffic was studied. Furthermore, the impact of different parameters on the vibration suppression performance of the improved PTMD system was analyzed. The numerical results indicate that the PTMD system is very effective in suppressing the displacements of the bridge caused by both the traffic-wind coupling and traffic-earthquake coupling. Moreover, the number, mass ratio, pounding stiffness, and gap values have a significant influence on the vibration suppression performance of the improved PTMD system. When the number of PTMD is increased from 3 to 9, the vibration reduction ratio of the vertical displacement is increased from 25.39% to 48.05%. As the mass ratio changes from 0.5% to 2%, the vibration reduction ratio increases significantly from 22.23% to 53.30%.

Keywords

Acknowledgement

The study was sponsored partially by the Natural Science Foundation China (Project No. 52078057) and the Postgraduate Scientific Research Innovation Project of Hunan Province (Project No. QL20220191). Natural Science Foundation General Project of Hunan Province (Project No. 2023JJ30044).

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