Wind and Structures

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Control effect and mechanism investigation on the horizontal flow-isolating plate for PI shaped bridge decks' VIV stability

  • Li, Ke (Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education) ;
  • Qian, Guowei (Department of Civil Engineering, School of Engineering, The University of Tokyo) ;
  • Ge, Yaojun (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University) ;
  • Zhao, Lin (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University) ;
  • Di, Jin (Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education)
  • Received : 2017.10.31
  • Accepted : 2018.06.05
  • Published : 2019.02.25
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Abstract

Vortex-Induced-Vibration (VIV) is one kind of the wind-induced vibrations, which may occur in the construction and operation period of bridges. This phenomenon can bring negative effects to the traffic safety or can cause bridge fatigue damage and should be eliminated or controlled within safe amplitudes.In the current VIV studies, one available mitigation countermeasure, the horizontal flow-isolating plate, shows satisfactory performance particularly in PI shaped bridge deck type. Details of the wind tunnel test are firstly presented to give an overall description of this appendage and its control effect. Then, the computational-fluid-dynamics(CFD) method is introduced to investigate the control mechanism, using two-dimensional Large-Eddy-Simulation to reproduce the VIV process. The Reynolds number of the cases involved in this paper ranges from $1{\times}10^5$ to $3{\times}10^5$, using the width of bridge deck as reference length. A field-filter technique and detailed analysis on wall pressure are used to give an intuitive demonstration of the changes brought by the horizontal flow-isolating plate. Results show that this aerodynamic appendage is equally effective in suppressing vertical and torsional VIV, indicating inspiring application prospect in similar PI shaped bridge decks.

Keywords

Acknowledgement

Supported by : National Science Foundation for Young Scientists of China, China Postdoctoral Science Foundation, Central Universities, Chong-qing Postdoctoral Science special Foundation

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