Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
권호 표지
DOI QR코드

DOI QR Code

Experiment for the Improvement of Fire Resistance Capacity of Reinforced Concrete Flexural Member Strengthened with Carbon Fiber Reinforced Polymer

CFRP로 보강된 철근콘크리트 휨부재의 내화성능 개선을 위한 실험

  • 임종욱 (한국교통대학교, 대학원) ;
  • 서수연 (한국교통대학교 건축공학과) ;
  • 송세기 (한국교통대학교, 대학원)
  • Received : 2017.08.05
  • Accepted : 2017.12.11
  • Published : 2017.12.26
⟨ Previous Next ⟩

Abstract

This paper is a study to improve the fire-resistance capacity of reinforced concrete (RC) members strengthened by fiber-reinforced-polymer (FRP). The fire resistance of the RC members strengthened by FRP was evaluated through high temperature exposure test. In order to improve the fire resistance of the FRP reinforcing method, a fire-proof board was attached to the reinforced FRP surface and then the high temperature exposure test was carried out to evaluate the improvement of the fire resistance performance. It was confirmed that the resistance to high temperature of NSMR could be improved somewhat compared with that of EBR from the experiment that exposed to high temperature under the load corresponding to 40% of nominal strength. When 30 mm thick fire-resistance (FR) board is attached to the FRP surface, the surface of the reinforced FRP does not reach $65^{\circ}C$, which is the glass transition temperature (GTT) of the epoxy until the external temperature reaches $480^{\circ}C$. In particular, when a high performance fire-proof mortar was first applied prior to FR board attachment, the FRP portion did not reach the epoxy glass transition temperature until the external temperature reached $600^{\circ}C$.

Keywords

Acknowledgement

Supported by : 국토교통부, 한국교통대학교

References

  1. ACI Committee 440 (2002). Guide for the Design and Construction of Concrete Reinforced with FRP Bars, American Concrete Institute.
  2. ACI Committee 216 (2007). Code Requirements for Determining Fire Resistance of Concrete and Masonry Construction Assemblies, American Concrete Institute.
  3. Blontrock, H., Taerwe, L., & Vandevelde, P. (2001). Fire testing of concrete slabs strengthened with fibre composite laminates, Proceeding of 5th International Conference on Fibre Reinforced Plastics for Reinforced Concrete Structures, Telford, Cambridge, U.K., 547.556.
  4. Eurocode (2004). Eurocode 3: Design of Steel Structure, Part 1,2: General Rules (EN 1993-1-1), Structural Fire Design (EN 1993-1-2). European Committee for Standardization.
  5. Foster, S. K., Bisby, L. A., & Eng, P. (2008). Fire survivability of externally bonded FRP strengthening system, Journal of Composites for Construction, 12(5), 553-561. https://doi.org/10.1061/(ASCE)1090-0268(2008)12:5(553)
  6. Kim, H., Seo, C., & Shin, H. (2005). An experimental study on the mechanical properties by compressive strength areas at high temperature, Journal of Architectural Institute of Korea, 21(7). 55-66.
  7. Moon, D. (2013). Critical temperature for inter-laminar shear strength and effect of exposure time of FRP rebars, Journal of Architectural Institute of Korea, 25(1), 45-51.
  8. Palmieri, A., Matthys, S., & Taerwe, L. (2011). Bond behavior of NSM FRP bars at elevated temperatures, Proceeding of First Middle East Conference on Smart Monitoring, Assessment and Rehabilitation Civil Structures. 1-7
  9. Seo, S., Choi, G., & Kwon, Y. (2012). Retrofit capacity of near-surface-mounted RC beam by using FRP Plate, Journal of The Korea Institute for Structural maintenance and Inspection, 16(1). 18-26. https://doi.org/10.11112/jksmi.2012.16.1.018
  10. Seo, S., & Kim, J. (2013). Bond capacity of nearsurface- mounted CFRP plate to concrete under various temperatures, Journal of the Korea Institute for Structural Maintenance and Inspection, 17(4), pp.75-83. https://doi.org/10.11112/jksmi.2013.17.4.075
  11. Woo, P., Jung, W., Ju, B., & Choi, Y. (2012). Evaluation of compressive strength of concrete reinforced with FRP subjected to temperature, International Journal of Concrete Structures and Materials. 12(11). 409-410.
  12. Yoen, J., & Seo, S. (2014). Evaluation on the thermal resistance capacity of fire proof materials for improving fire resistance of near-surface-mounted FRP in concrete, Journal of the Korea Institute for Structural Maintenance and Inspection, 18(5), 51-58. https://doi.org/10.11112/jksmi.2014.18.5.051