Steel and Composite Structures

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Study on the mechanism of the vortex-induced vibration of a bluff double-side box section

  • Li, Yu (School of Highway, Chang'an University) ;
  • Li, Chen (School of Architecture, Chang'an University) ;
  • Wang, Feng (School of Highway, Chang'an University) ;
  • Li, Jia-wu (School of Highway, Chang'an University)
  • Received : 2020.09.24
  • Accepted : 2021.09.23
  • Published : 2021.10.25
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Abstract

At present, researchers mainly focused on the vortex-induced vibration (VIV) of the double-side I-shaped girder, while there are only a few literatures focused on the VIV of the bluff double-side box girder, especially the study on the synchronous pressure- and vibration- measured test for the bluff double-side box girder has not been reported. Therefore, in this study, the vibration-measured test, the Numerical Wind Tunnel Simulation, and the synchronous pressure- and vibration-measured test were conducted to study the VIV mechanism of the bluff double-side box girder. Firstly, a section model of the bluff double-side box girder was designed, and the vibration-measured test was conducted to study the influence of mass ratio, damping ratio, and aerodynamic countermeasures on the VIV of the bluff double-side box girder. Secondly, the Numerical Wind Tunnel Simulation was conducted to simulate the vorticity evolution of the bluff double-side box girder, which was used to help analyze the results of the synchronous pressure- and vibration- measured test. Finally, the synchronous pressure- and vibration-measured test was conducted to investigate the wind pressure distribution and aerodynamic forces on the surface of the double-side box girder, which was then used to study the VIV mechanism of the bluff double-side box girder by combining the simulated vorticity evolutions. So, when the VIV of the double-side box girder occurs, it is found that: there is a significant difference in the mean and fluctuating wind pressure between the upper and lower surfaces; moreover, at the leading and trailing edges, the aerodynamic forces contribute greatly to the VIV, the correlation between the aerodynamic forces and the vortex-induced aerodynamic forces is positive, and with the increase of this coefficient, it will lead to the more significant VIV.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (No. 51408042). The authors wish to express their gratitude to the sponsors.

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