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Steel and Composite Structures Volume 41, Number 2, October 2021 , pages 293-315 DOI: https://doi.org/10.12989/scs.2021.41.2.293 |
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Study on the mechanism of the vortex-induced vibration of a bluff double-side box section |
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Yu Li, Chen Li, Feng Wang and Jia-wu Li
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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. | ||
| Key Words | ||
| aerodynamic countermeasure; bluff double-side box section; numerical wind tunnel simulation; synchronous pressure- and vibration- measured test; vortex-induced vibration | ||
| Address | ||
| Yu Li, Feng Wang and Jia-wu Li: School of Highway, Chang'an University, Xi'an 710064, China Chen Li: School of Architecture, Chang'an University, Xi'an 710061, China | ||