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Wind and Structures Volume 24, Number 5, May 2017 , pages 447-464 DOI: https://doi.org/10.12989/was.2017.24.5.447 |
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Flutter performance of central-slotted plate at large angles of attack |
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Haojun Tang, Yongle Li, Xinzhong Chen, K.M. Shum and Haili Liao
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| Abstract | ||
| The flutter instability is one of the most important themes need to be carefully investigated in the design of long-span bridges. This study takes the central-slotted ideal thin flat plate as an object, and examines the characteristics of unsteady surface pressures of stationary and vibrating cross sections based on computational fluid dynamics (CFD) simulations. The flutter derivatives are extracted from the surface pressure distribution and the critical flutter wind speed of a long span suspension bridge is then calculated. The influences of angle of attack and the slot ratio on the flutter performance of central-slotted plate are investigated. The results show that the critical flutter wind speed reduces with increase in angle of attack. At lower angles of attack where the plate shows the characteristics of a streamlined cross-section, the existence of central slot can improve the critical flutter wind speed. On the other hand, at larger angles of attack, where the plate becomes a bluff body, the existence of central slot further reduces the flutter performance. | ||
| Key Words | ||
| central-slotted plate; aerodynamic interference; flutter derivatives; flutter performance; large angles of attack | ||
| Address | ||
| Haojun Tang: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China; CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology, Hong Kong, China Yongle Li and Haili Liao: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, China Xinzhong Chen: National Wind Institute, Department of Civil, Environmental and Construction Engineering, Texas Tech University, Lubbock, Texas 79409-1023, USA K.M. Shum: CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology, Hong Kong, China | ||