Wind and Structures

Techno-Press (테크노프레스)
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Flutter performance of central-slotted plate at large angles of attack

  • Tang, Haojun (Department of Bridge Engineering, Southwest Jiaotong University) ;
  • Li, Yongle (Department of Bridge Engineering, Southwest Jiaotong University) ;
  • Chen, Xinzhong (National Wind Institute, Department of Civil, Environmental and Construction Engineering, Texas Tech University) ;
  • Shum, K.M. (CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology) ;
  • Liao, Haili (Department of Bridge Engineering, Southwest Jiaotong University)
  • Received : 2016.10.04
  • Accepted : 2017.05.01
  • Published : 2017.05.25
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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.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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