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하중이력에 따른 탄소섬유로 보강된 RC보의 휨 거동

Flexural Behavior of Reinforced Concrete Beam Strengthened with Carbon Fiber Sheet under Load History

  • 투고 : 2014.07.31
  • 심사 : 2015.01.08
  • 발행 : 2015.01.31

초록

본 연구에서는 합리적인 보강설계를 위하여 기존 철근콘크리트 보에 탄소섬유시트 보강시 하중이력에 따른 휨보강 효과를 분석하였다. 실구조물에서는 다양한 하중이력을 겪은 철근콘크리트보에 보강을 하게 되나 보강시기에 따른 구조물과 보강재료의 초기상태가 고려되지 않으므로 구조물의 안전적 측면과 경제적 측면으로 문제점을 발생시킬 수 있는 요인이 된다. 다양한 하중이력을 거친 RC 보의 변형률 상태를 고려하여 탄소섬유시트 보강에 따른 거동변화를 분석하였다. 휨보강후 거동에 영향을 미치는 변수들에 대하여 보강대상 부재의 하중이력의 영향을 고려한 비선형 단면해석결과 탄소섬유 휨보강보의 보강 후 구조적 성능은 하중이력에 따라 달라지는 것으로 나타났다. 탄소섬유 휨보강보의 휨강도는 하중이력에 크게 영향을 받으므로 설계시 반드시 고려하여야 한다.

This study examined the flexural strength of CFS reinforced concrete beams with various load histories. The RC beams to be reinforced by CFS have undergone various loading histories but neglecting the loading history results in a few problems in structural safety and cost. Structural behavior of CFS-strengthened RC beams were analyzed considering the strain status of RC beams under loads at the time of CFS strengthening. Nonlinear section analysis showed that the flexural strength of CFS-strengthened RC beams depends on the load history of the RC beams. From the result of this analysis, the flexural strength of a CFS-strengthened concrete beam is affected considerably by the load history and should be considered in CFS reinforcement.

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참고문헌

  1. Wan-Chul Choi, et al., "Repair and rehabilitation of concrete structures", Journal of Korean Concrete Institute, Vol.47 No.6, pp. 5-12, Dec., 1995.
  2. Jong-Yeol Lee, et al., "Recent development of structural repair and rehabilitation materials", Journal of Korean Concrete Institute, Vol.47 No.4, pp. 34-45, April., 1995.
  3. Jong-Sung Shim, "The Currency of Recent Studies for the Repair and Rehabilitation of R/C Structures ", Journal of Korean Concrete Institute, Vol.7 No.6, pp. 64-73, Dec., 1995.
  4. T. M. Roberts, and H. Haji-Kazemi, "Theoretical Study of the Behaviour of Reinforced Concrete Beams Strengthened by Externally Binded Steel Plates", Proceedings, The Institution of Civil Engineers, Vol. 87, Part 2, pp 39-55, 1989. DOI: http://dx.doi.org/10.1680/iicep.1989.1452
  5. Yeong-Soo, Shin., and Geon-Ho, Hong., "Flexural Behaviour of RC Beams Strengthened with Steel Plates/Carbon Fiber Sheets(CFS) under Pre-Loading Conditions", KCI Concrete Journal, Vol. 12, N0. 1, pp 69-77, 2000. 1.
  6. E. Hognestad, N. W. Hanson, "Concrete Stress Distribution in Ultimate Strength Design", ACI Journal, Vol. 52, No. 4, pp. 475-479, December 1955.
  7. Scordelis, C. Alexander, C. S. Lin, "Nonlinear Analysis of RC Sheels of Gernal Form Proceeding", ASCE, Vol. 101, DT3, pp. 523-538, Mar., 1975.
  8. Hu, M. T., and Schmobrich, W. C., "Nonlinear finite element analysis of Reinforced Concrete and Sheels under Monotonic Loading", Computer & Structure, Vol. 38, No. 516, pp. 637-651, 1991. DOI: http://dx.doi.org/10.1016/0045-7949(91)90015-E
  9. Yoon, T. H., Kang K. S., "Analytical Study on the Flexural Strength of CFS Reinforced Concrete Beams under Service Loads", Journal of the Korea Academia-Industrial cooperation society, Vol.12, No.8, pp.3745-3751, 2011 https://doi.org/10.5762/KAIS.2011.12.8.3745