KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지
DOI QR코드

DOI QR Code

An Experimental Study on the Structural Performance of Horizontally Curved Precast PSC Girder

프리캐스트 곡선 PSC 거더의 구조 성능에 관한 실험연구

  • Received : 2014.08.21
  • Accepted : 2015.06.11
  • Published : 2015.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

The main purpose of this study is to investigate the static behavior of a horizontally curved prestressed concrete (PSC) girder. A 30m long full-scale curved PSC girder with 80.0m radius is fabricated by a portable curved form system. Deflections and concrete strains at the middle of span were measured. The obtained experimental results have been compared to those from F.E.A. analysis. When a initial crack developed, the applied load was 1.3 times the service design load and the vertical deflection at the middle of span satisfied the requirement for a live load state according to the Korea Bridge Design Specifications (2010). Also, the ductility of the full scale specimen satisfied the limit in the Specifications (2010). To verify the experimental results, a numerical F.E. analysis was carried and confirmed that the data were similar with results from the test above. The horizontally curved PSC girder fabricated on site was found to have enough strength for safety under and after construction.

이 연구에서는 이동식 곡선거푸집으로 제작된 현장제작 곡선 PSC 거더의 정적거동을 조사하는 것이 주요 목적이다. 다양한 곡선선형 제작이 용이한 이동식 곡선거푸집을 이용하여 현장에서 제작된 지간 30m, 곡선반경 80m인 곡선 PSC 거더에 대한 재하시험이 수행되었다. 모든 시험결과는 수치해석결과와 비교되었으며, 거더의 중앙부에 대한 변위와 변형률이 측정되었다. 실험결과에서 실물모형 시험체의 초기균열발생 하중은 사용하중보다 1.3배 증가한 하중에서 발생하였다. 또한, 연성설계기준을 만족하여 시험체는 초기균열 발생 후에 취성파괴되지 않고 연성 파괴될 것으로 판단되었다. 사용성 검토에서 균열발생 시의 처짐값이 도로교설계기준(2010)에서 제시한 활하중 재하 시의 허용처짐량을 만족하였다. 유한요소 해석결과와 시험결과는 전체적인 거동이 매우 유사하게 나타났으며, 현장제작 곡선 PSC 거더의 사용성과 안전성 측면에서는 큰 문제가 없는 것으로 판단된다.

Keywords

References

  1. AASHTO (2012). AASHTO LRFD bridge design for highway bridges, 5th Ed., American Association of State Highway Transportation Officials, Washington, D.C.
  2. ABAM Engineers (1988). "Precast prestressed concrete horizontally curved bridge beams." Journal of the Prestressed Concrete Institute, Vol. 33, No. 5, PCI Special Report.
  3. Sun, C., Hennessey, S., Ahlman, M. and Tadros, M. (2007). "Value engineering arbor road bridge with curved precast concrete girder." PCI Journal, Vol. 52, No. 2, pp. 94-106. https://doi.org/10.15554/pcij.03012007.94.106
  4. Kim, S. J., Lee, J. H., Kim, S. B., Park, J. C. and Kim, J. H. (2012). "Structural behavior of precast PSC curved bridges." Proceeding of the Korean Society of Civil Engineers, KSCE, pp. 1407-1410 (in Korean).
  5. Kwon, Y. S. and Kim, T. H. (2012). "Daegu metropolitan railway line 3 constructed using curved beams." Magazine of the Korea Concrete Institute, KCI, Vol. 24, No. 5, pp. 46-48 (in Korean). https://doi.org/10.22636/MKCI.2012.24.5.46
  6. Lee, J. H., Kim, D. H., Park, J. H., Shin, M. G. and Kim, S. J. (2011). "Investigation and analysis on the current status of curved concrete bridge in Korea." Proceeding of the Korea Concrete Institute, KCI, pp. 667-668 (in Korean).
  7. Lee, Y. S., Jin, B. M., Kim, I. S. and Kim, Y. J. (2010) "Inspection of safety under prestressing step for curved PSC girder." Proceeding of the Korean Society of Civil Engineers, KSCE, p. 2505 (in Korean).
  8. MidasIT (2004). Analysis & Algorithm. (in Korean).
  9. Ministry of Land, Transport and Maritime Affairs of South Korea (MLTMA) (2010). Standards for road bridge design (in Korean).
  10. Ministry of Land, Transport and Maritime Affairs of South Korea (MLTMA) (2012). Standards for road bridge design-limit state design method (in Korean).
  11. NCHRP (2008). Design specifications and commentary for horizontally curved concrete box girder highway bridges., National Cooperative Highway Research Program Final Report. (in USA).
  12. Precast/Prestressed Concrete Institute (2011). Precast prestressed concrete bridge design manual (I),(II).
  13. Seo, Y. J. and Yoon, J. G. (2013). "Investigation into the applicability of a concrete bridge to curved bridges." Proceeding of the Korea Concrete Institute, KCI, pp. 665-666 (in Korean).
  14. Wilast Amorn, Christoper Y. Tuan, and Maher K. Tadros (2008). "Curved, precast, pretensioned concrete I-girder bridges." PCI Journal, pp. 48-66.