Wind Tunnel Aeroelastic Studies of Steel Cable-stayed Bridge with Wind Cable and Temporary Support

강 사장교 가설 중 임시 제진방법에 대한 풍동실험 연구

  • 조재영 (고려대학교 사회환경시스템공학과) ;
  • 심종한 (고려대학교 사회환경시스템공학과) ;
  • 이학은 (고려대학교 사회환경시스템공학과) ;
  • 권오훈 (GS건설(주))
  • Received : 2005.10.15
  • Accepted : 2005.12.12
  • Published : 2006.02.27

Abstract

Cable-stayed bridges are more inherently vulnerable to wind during the erection stages than when they are already being used. Even if a bridge that is already being used is aerodynamically stable, it is prone to having aerodynamic instabilities within the design wind speed during construction. Therefore, when the bridge's designers deliberate on the method they will use in constructing the bridge, they must likewise come up with a suitable plan to ensure the stability of the bridge during its erection (e.g., conducting a wind-tunnel investigation). This paper describes the aeroelastic full-bridge model tests that were conducted to investigate the aerodynamic behavior of the bridge during erection, with emphasis on aerodynamic stability and the mitigation of the buffeting response through temporary stabilization. The aerodynamic performance of a cable -stayed bridge with a main span of 50 m was studied in its completed stage and in two erection stages, corresponding 50% and 90% completion, respectively. In the 50% erection stage tests, a balanced cantilever configuration, with wind cable and temporary support at the tower, was conducted. The system that was determined to be most effective in reducing wind action on the bridge during construction was proposed in the paper, based on the results of the comparative study that was conducted.

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