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


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.


  1. 건설교통부(2005) 도로교설계기준.
  2. 오병환, 이성철, 최영철(2004) 엑스트라도즈드 PSC 교량의 구조 거동 해석, 대한토목학회 정기학술대회 논문집, 대한토목학회,pp. 2040-2044.
  3. 유영, 조정식, 김동근, 유웅석(2005) Extradosed PSC교 사재 장력의 유효전달길이에 관한 연구, 대한토목학회 정기학술대회논문집, 대한토목학회, pp. 123-126.
  4. 日本道路橋協會(1990) 道路橋示方書.同解說.
  5. Cho, I.H. (2003) Analysis of cable force distribution in extradosed PSC Bridges, Master's thesis, Seoul National University.
  6. Gimsing, N.J. (1997) Cable Supported Bridges:Concept and Design, John Wiley & Sons, Inc.
  7. Kawasaki, H. and Yamauchi, A. (2000) New design consideration technique in Matakina bridge, Prestressed Concrete, Vol. 42, No. 3, pp. 32-36.
  8. Komiya, M. (1997) Consideration concerning structural character in extradosed bridge, Civil Engineering Association Scientific Thesis Collection, Vol. 516, pp. 27-39.
  9. Leonhardt, F. (1987) Cable stayed bridges with prestressed concrete, PCI Journal, Vol. 32, No. 5.
  10. Mathivat, J. (1988) Recent development in prestressed concrete bridges. FIB note, pp. 15-22.
  11. Matsushita, H., Kawasaki, H., and Shiota, R. (2002) Structural and Economical Characteristics of Extradosed Bridge with Multiple Span and High Tower, Proceedings of FIB Symposium, pp. 117-124.
  12. Oka, K., Kasuga, A., and Yamasaki, J. (1997) Consideration concerning structural character in extradosed bridge, Prestressed Concrete, Vol. 9, No. 2, pp. 53-58.
  13. Spcifications for Design and Construction of Prestressed Concrete Cable-Stayed Bridges and Extradosed Bridges (2000) Japan Prestressed Concrete Engineering Association.