Volume 25 Issue 3
Jun.  2025
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LI Jia-wu, MENG Lu, ZHAO Bo-long, XIAO Tian-bao, LU Bin. Vortex-induced vibration test of twin-box girder with inverted L-shaped plates[J]. Journal of Traffic and Transportation Engineering, 2025, 25(3): 101-113. doi: 10.19818/j.cnki.1671-1637.2025.03.006
Citation: LI Jia-wu, MENG Lu, ZHAO Bo-long, XIAO Tian-bao, LU Bin. Vortex-induced vibration test of twin-box girder with inverted L-shaped plates[J]. Journal of Traffic and Transportation Engineering, 2025, 25(3): 101-113. doi: 10.19818/j.cnki.1671-1637.2025.03.006
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Vortex-induced vibration test of twin-box girder with inverted L-shaped plates

doi: 10.19818/j.cnki.1671-1637.2025.03.006
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    CCCC Second Highway Engineering Co., Ltd., Xi'an 710065, Shaanxi, China

Funds:

National Natural Science Foundation of China 51978077

More Information
  • Corresponding author: LI Jia-wu (1972-), male, professor, PhD, ljw@gl.gfscw.cn
  • Received Date: 2024-01-08
  • Accepted Date: 2024-10-21
  • Rev Recd Date: 2024-08-19
  • Publish Date: 2025-06-28
    Abstract
  • To evaluate the vortex-induced vibration (VIV) characteristics of a twin-box girder with inverted L-shaped plates, a cable-stayed bridge was used as the research object, a main beam sectional model with a scale ratio of 1∶70 was designed and fabricated. A sectional model vibration system with spring suspension was established in the wind tunnel laboratory, which could perform vertical bending and torsional 2-degree-of-freedom (DOF) motion. By changing the equivalent mass and damping ratio of the vertical bending and torsion of the vibration system, wind tunnel tests for determining vibration were conducted to analyze the sensitivity of the maximum amplitude and lock-in region of VIV to these parameters. By changing the characteristic size of the inverted L-shaped plates, wind tunnel tests for synchronous pressure and vibration measurement were conducted. The surface pressure and vibration amplitude of the model were measured. The distribution characteristics of surface pressure and VIV response were analyzed. The vortex-induced aerodynamic force was calculated, and the correlation and contribution of the local aerodynamic force on the main girder section to the overall aerodynamic force were analyzed. The distribution law of aerodynamic force in the span-wise direction of the model was explored. Analysis results show that changes in mass and damping parameters and aerodynamic shape can alter the VIV response of the twin-box girders. Overall, the maximum amplitude of VIV and the length of the lock-in region are negatively correlated with the Sc number. When the lock-in phenomenon occurs, the correlation coefficient, contribution coefficient, and pulsating pressure coefficient of local aerodynamic force and overall aerodynamic force remain consistent with the amplitude variation law, and the surface pressure and aerodynamic force change synchronously. The span-wise correlation coefficient of wind pressure decreases with increasing span-wise spacing and is closely related to amplitude. The inverted L-shaped plate changes the separation and reattachment position of the airflow, thereby suppressing the occurrence of VIV. Its aspect ratio is a key parameter for the vibration suppression effect.

     

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