An Improved Method for Initial Shape Analysis of Cable-Stayed Bridges

사장교의 개선된 초기형상 해석법

  • 김문영 (성균관대학교 토목환경공학과) ;
  • 경용수 (성균관대학교 토목환경공학과) ;
  • 이준석 (성균관대학교 토목환경공학과)
  • Received : 2002.12.30
  • Accepted : 2003.02.03
  • Published : 2003.04.27

Abstract

The extended tangent stiffness matrices and force-deformation relations of the elastic catenary element were initially derived through the addition of the unstrained length of cables to unknown nodal displacements. A beam-column element was then introduced to model the deck and pylon of cable-stayed bridges. The conventional geometric nonlinear analysis, initial force method, and TCUD method were summarized, with an effective method combining two methods presented to determine the initial shapes of cable-stayed bridges with dead loads. In this combined method, TCUD method was applied to eliminate vertical and horizontal displacements at cable-supported points of decks and on top of pylons, respectively. The initial force method was also adopted to eliminate horizontal and vertical displacements of decks and pylons, Finally, the accuracy and validity of the proposed combined method were demonstrated through numerical examples.

Acknowledgement

Supported by : 한국과학재단

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