Wind and Structures

Techno-Press (테크노프레스)
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A simplified vortex model for the mechanism of vortex-induced vibrations in a streamlined closed-box girder

  • Hu, Chuanxin (Department of Civil Engineering, Wuhan University of Science and Technology) ;
  • Zhao, Lin (State Key Lab of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Ge, Yaojun (State Key Lab of Disaster Reduction in Civil Engineering, Tongji University)
  • Received : 2021.01.16
  • Accepted : 2021.03.30
  • Published : 2021.04.25
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Abstract

The vortex-drift pattern over a girder surface, actually demonstrating the complex fluid-structure interactions between the structure and surrounding flow, is strongly correlated with the VIVs but has still not been elucidated and may be useful for modeling VIVs. The complex fluid-structure interactions between the structure and surrounding flow are considerably simplified in constructing a vortex model to describe the vortex-drift pattern characterized by the ratio of the vortex-drift velocity to the oncoming flow velocity, considering the aerodynamic work. A spring-suspended sectional model (SSSM) is used to measure the pressure in wind tunnel tests, and the aerodynamic parameters for a typical streamlined closed-box girder are obtained from the spatial distribution of the phase lags between the distributed aerodynamic forces at each pressure point and the vortex-excited forces (VEFs). The results show that the ratio of the vortex-drift velocity to the oncoming flow velocity is inversely proportional to the vibration amplitude in the lock-in region and therefore attributed to the "lock-in" phenomena of the VIVs. Installing spoilers on handrails can destroy the regular vortex-drift pattern along the girder surface and thus suppress vertical VIVs.

Keywords

References

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