A Study on the Performance Improvement of High-Pylon Extradosed Bridge adopting Fatigue Loading Condition

국내 설계하중의 피로특성을 적용한 고주탑 엑스트라도즈드교의 성능개선에 관한 연구

  • Received : 2009.12.08
  • Accepted : 2010.02.03
  • Published : 2010.04.30

Abstract

This study proposes the optimal ratio of vertical load-carrying capacity (${\beta}$) by investigating structural performances and economic efficiency in the extradosed bridges. Without design standards for the extradosed bridge, Japanese design standards have been used domestically. For the design live load, DL24 is found to be more adequate than DB24. Using the DL24 load, parameter studies are carried out. The parameters are 'main tower height', 'main girder stiffness', and 'cable arrangement'. As a result, it is found that one side cable-stayed extradosed bridges are more economical than double side cable-stayed extradosed bridges. This study also shows that when the ratio of vertical load-carrying capacity(${\beta}$) is 30~50% in the extradosed bridge with the ratio of tower height to main span length 1/6, the extradosed bridge is most economical because of the cable stress less than the allowable stress.

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