Effect of Geometric Shapes on Stability of Steel Cable-stayed Bridges

기하형상에 따른 강사장교의 안정성에 관한 연구

  • 김승준 (고려대학교 공학기술연구소) ;
  • 한승룡 (고려대학교 건축사회환경공학과) ;
  • 김종민 (고려대학교 건축사회환경공학과) ;
  • 조선규 (서울과학기술대학교 건설공학부) ;
  • 강영종 (고려대학교 건축사회환경공학부)
  • Received : 2009.12.02
  • Accepted : 2011.02.14
  • Published : 2011.02.28

Abstract

This paper presents an investigation of the structural stability of cable-stayed bridges, using geometric nonlinear finite-element analysis and considering various geometric nonlinearities, such as the sag effect of the cables, the beam-column effect of the girder and mast, and the large displacement effect. In this analytic research, a nonlinear frame element and a nonlinear equivalent truss element were used to model the girder, mast, and cable member. The live-load cases that were considered in this research were assumed based on the traffic loads. To perform reasonable analytic research, initial shape analyses in the dead-load case were performed before live-load analysis. In this study, the geometric nonlinear responses of the cable-stayed bridges with different cable arrangement types were compared. After that, parametric studies on the characteristics of the structural stability in critical live-load cases were performed considering various geometric parameters, such as the cable arrangement type, the stiffness ratios of the girder and mast, the area of the cables, and the number of cables. Through this parametric study, the effect of geometric shapes on the structural stability of cable-stayed bridges was investigated.

Acknowledgement

Supported by : 국토해양부

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