Stability Analysis of Steel Cable-stayed Bridges under Construction Stage

폐합 전 강사장교의 안정성 해석

  • 김승준 (고려대학교 공학기술연구소) ;
  • 심경석 (삼성물산 건설부문 토목사업본부) ;
  • 원덕희 (고려대학교 건축사회환경공학과) ;
  • 조선규 (서울과학기술대학교 건설공학부) ;
  • 강영종 (고려대학교 건축사회환경공학부)
  • Received : 2009.12.30
  • Accepted : 2011.02.14
  • Published : 2011.02.28

Abstract

This paper presents an investigation of the structural stability of cable-stayed bridges in the construction stage, using geometric nonlinear finite-element analysis and considering various geometric nonlinearities, such as the sag effect of the cables, the P-${\Delta}$ effects of the girder and mast, and the large displacement effect. Initial shape analysis and construction-stage analysis were performed to determine the equilibrium of the structure in the construction stage. After that, geometric nonlinear analysis was performed to study structural stability. In this study, the weight of the derrick crane and the key segment were considered the main external loads, which were applied to the tip of the center span. The cable arrangement type and the stiffness ratios of the girder and mast were considered the main parameters of the analytic research. Based on the results of the analysis, the change in the buckling mode and critical load factors with respect to the cable arrangement type and the stiffness ratios of the girder and mast was investigated. The buckling modes of the steel cable-stayed bridges in the construction stage were classified, and the ranges of the stiffness ratios of the girder and mast, which show these classified buckling modes, were suggested.

Acknowledgement

Supported by : 국토해양부

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