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Effects of Flexural Rigidity of Center Tower in Four-Span Suspension Bridges

4경간 현수교에서의 중앙주탑 휨강성의 영향

  • 권순길 (한양대학교 건설환경공학과) ;
  • 유훈 (현대건설 연구개발본부) ;
  • 최동호 (한양대학교 건설환경공학과)
  • Received : 2013.07.02
  • Accepted : 2013.09.10
  • Published : 2014.02.01

Abstract

For simple and accurate analysis for behaviors of multi-span suspension bridges which are expected to be frequently constructed as strait-crossing bridges, the deflection theory as the peculiar theory of a suspension bridge can be applied. This paper performs a structural analysis for four-span suspension bridges using the deflection theory. Simply-supported beams with tension are used for girders and the deflections of the beams due to the vertical loads and moments at supports are calculated. The calculation is performed iteratively until the deflections satisfy the compatibility equations of cables. The results of the deflection theory analysis considering tower rigidity are compared with those of the finite element analysis for verification. Importance of the tower rigidity for four-span suspension bridges is confirmed using various compatibility equations of the cable due to variation of the constraint conditions between main cable and top of towers. In addition, the simple parametric analysis for variation of the center tower rigidity is performed.

Acknowledgement

Supported by : 국토해양부

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  1. Feasible Range for Midtower Lateral Stiffness in Three-Tower Suspension Bridges vol.23, pp.3, 2018, https://doi.org/10.1061/(ASCE)BE.1943-5592.0001196