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Wind and Structures Volume 32, Number 5, May 2021 , pages 509-520 DOI: https://doi.org/10.12989/was.2021.32.5.509 |
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Flutter performance of box girders with different wind fairings at large angles of attack |
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Haojun Tang, Hang Zhang, Wei Mo and Yongle Li
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| Abstract | ||
| The streamlined box is a common type of girders for long-span suspension bridges. Spanning deep canyons, long-span bridges are frequently attacked by strong winds with large angles of attack. In this situation, the flow field around the streamlined box changes significantly, leading to reduction of the flutter performance. The wind fairings have different effects on the flutter performance. Therefore, this study examines the flutter performance of box girders with different wind fairings at large angles of attack. Computational fluid dynamics (CFD) simulations were carried out to extract the flutter derivatives, and the critical flutter state of a long-span bridge was determined. Further comparisons of the wind fairings were investigated by a rapid method which is related to the input energy by the aerodynamic force. The results show that a reasonable type of wind fairings could improve the flutter performance of long-span bridges at large angles of attack. For the torsional flutter instability, the wind fairings weaken the adverse effect of the vortex attaching to the girder, and a sharper one could achieve a better result. According to the input energies on the girder with different wind fairings, the symmetrical wind fairings are more beneficial to the flutter performance. | ||
| Key Words | ||
| angles of attack; box girders; flow field characteristics; flutter performance; numerical simulations; wind fairings | ||
| Address | ||
| Haojun Tang:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China/ Wind Engineering Key Laboratory of Sichuan Province, Chengdu 610031, China Hang Zhang:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China Wei Mo:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China Yongle Li:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China/ Wind Engineering Key Laboratory of Sichuan Province, Chengdu 610031, China | ||