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Wind and Structures Volume 32, Number 5, May 2021 , pages 423-437 DOI: https://doi.org/10.12989/was.2021.32.5.423 |
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Windproof ability of aerodynamic measures to improve the wind environment above a truss girder |
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Zewen Wang, Haojun Tang, Yongle Li, Junjie Guo and Zhanhui Liu
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| Abstract | ||
| Aerodynamic measures have been widely used for improving the flutter stability of long-span bridges, and this paper focuses their windproof ability to improve the wind environment for vehicles. The whole wind environment around a long-span bridge located in high altitude mountainous areas is first studied. The local wind environment above the deck is then focused by two perspectives. One is the windproof effects of aerodynamic measures, and the other is whether the bridge with aerodynamic measures meets the requirement of flutter stability after installing extra wind barriers in the future. Furthermore, the effects of different wind barriers are analyzed. Results show that aerodynamic measures exert potential effects on the local wind environment, as the vertical stabilizer obviously reduces wind velocities behind it while the closed central slot has limited effects. The suggested aerodynamic measures have the ability to offset the adverse effect of the wind barrier on the flutter stability of the bridge. Behind the wind barrier, wind velocities decrease in general, but in some places incoming flow has to pass through the deck with higher velocities due to the increase in blockage ratio. Further comparison shows that the wind barrier with four bars is optimal. | ||
| Key Words | ||
| mountainous terrain; wind environment; truss girder; aerodynamic measures; wind barriers; windproof ability; flutter stability | ||
| Address | ||
| Zewen Wang:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China Haojun Tang:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China Yongle Li:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China Junjie Guo:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China Zhanhui Liu:Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China | ||