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

Architectural Institute of Korea (대한건축학회)
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Self Sensing Reinforcement Combined with Fiber-Optic Sensor and FRP Strip for Structural Reinforcement

구조물 보강용 FRP 판과 광섬유 센서가 결합된 자기감지 보강재

  • 송세기 (한국교통대학교 대학원) ;
  • 서수연 (한국교통대학교 건축학부) ;
  • 김강수 (서울시립대학교 건축공학과)
  • Received : 2019.01.29
  • Accepted : 2019.07.22
  • Published : 2019.08.30
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Abstract

Recently, it is required to develop a monitoring technology that combines an FBG sensor as a means for continuously monitoring whether reinforcing effect of FRP is maintained on FRP reinforced structural members. However, most existing researches focus on the insertion of FBG sensors into bar-shaped FRPs, and there is insufficient study on the details strip-type FRPs combined with FBG sensors. Therefore, in this paper, it is studied to develop a reinforcement in which a FBG sensor is combined with a FRP strip. Especially, combination of FRP and FBG sensor. For this, a series of experiments were performed to find the adhesive strength of fiber-FRP-epoxy joints, the tensile strength of FBG sensor part with reflection-lattice, and the performance depending on the connection method of FRF and FBG sensor. As a result of the study, it was found that a minimum strength of $216.15N/mm^2$ is required for incorporating FBG sensors in FRP using epoxy. It is considered that the adhesion length of epoxy joints should be more than 50mm. When the FBG sensor is attached to the FRP strip as an epoxy, it is considered appropriate to use the complete attachment and the sensor non-attachment method.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

  1. Chan, Y. W. S., & Zhou, Z. (2014). Advances of FRP-based smart components and structures, Pacific Science Review, 16, 1-7. https://doi.org/10.1016/j.pscr.2014.08.001
  2. EI-Hacha, R., & Rizkalla, S. (2004). Near-Surface-Mounted Fiber-Reinforced Polymer Reinforcements for Flexural Strengthening of concrete Structures, ACI Structural Journal, 101(5), 717-726.
  3. FBG Korea (2017). www.fbg.co.kr.
  4. Gwak, K., Sung, B., & Jang H. (2006). Development of estimated model for axial displacement of hybrid FRP rod using strain, Journal of the Korean Society of Civil Engineers, 26(4A), 639-645
  5. Hill, K. O., Fujii, Y., Johnson, D. C., & Kawasaki, B. S. (1978). Photosensitivity in optical fiber wave guides: application to reflection fiber fabrication, Applied Physics Letter, 32(10), 647. https://doi.org/10.1063/1.89881
  6. Huang, S., Ohn, M. M., & LeBlanc, M. (1998). Measures RM. continuous arbitrary strain profile measurements with fibre bragg grating, Journal of Smart Material Structure, 7, 248-256. https://doi.org/10.1088/0964-1726/7/2/012
  7. Lau, K., Yuan, L., Zhou, L., Wu, J., & Woo, C. (2001) Strain monitoring in FRP laminates and concrete beams using FBG, Composite Structures, 51, 9-20. https://doi.org/10.1016/S0263-8223(00)00094-5
  8. Lopez-Higuera, J. M., Cobo, L. R., Inceral A. Q., & Corbo A. (2011). Fiber optic sensors in structural health monitoring, Journal of Lightwave Technology, 29 (4), 587-608. https://doi.org/10.1109/JLT.2011.2106479
  9. Jung, W. (2009). Flexural behavior of reinforced concrete beams strengthened with NSM CFRP reinforcements considering the equivalent section, Doctoral thesis, Myeongji university.
  10. Kim, M. (2007). FBG optical fiber sensors embedded in fiber reinforced polymer composite reinforcing bars, Journal of the Korean Society for Nondestructive Testing, 27(2), 124-133.
  11. Min, J. (2003). Study on monitoring method of R.C. beams strengthened with fiber reinforced polymer (FRP) by optical FBG sensor, Master Thesis, Ewha University
  12. Schaller, M. B., Kaseberg, S., & Kuhne, M. (2010). Smart CFRP systems for the controlled retrofitting of reinforced concrete members, Proceedings of SPIE, The International Society for Optical Engineering, 7653
  13. Seo, S., Oh, J., & Choi, K. (2011). Bond capacity of concrete member strengthened by various methods using FRP plate, Journal of the Architectural Institute of Korea, Structure & Construction, 27(8), 55-63.
  14. Seo, S. (2012). Bond strength of near surface-mounted FRP plate in RC member, Journal of the Korea Concrete Institute, 24(4), 415-422. https://doi.org/10.4334/JKCI.2012.24.4.415
  15. Seo, S., Feo, L., & Hui, D. (2013). Bond strength of near-surface-mounted FRP plate for retrofit of concrete structures, Composite Structures, 95, 719-727. https://doi.org/10.1016/j.compstruct.2012.08.038
  16. Seo, S. (2014). Analysis on the interfacial bond-slip relationship between near surface-mounted FRP plate and concrete, Journal of the Korea Concrete Institute, 26(1), 79-86. https://doi.org/10.4334/JKCI.2014.26.1.079
  17. Seo, S., Choi, K., Kwon, Y., & Lee, K. (2016a) Flexural strength of RC beam strengthened by partially de-bonded near-surface-mounted FRP strip, International Journal of Concrete Structures and Materials, Korea Concrete Institute, 10(2), 149-161. https://doi.org/10.1007/s40069-016-0133-z
  18. Seo, S., Lee, Lee, M. S., & Feo, L. (2016b). Flexural analysis of RC beam strengthened by partially de-bonded NSM FRP strip, Composite Part B, 101(15), 21-30. https://doi.org/10.1016/j.compositesb.2016.06.056
  19. SK Chemicals (2018). SK Total strengthening & Reinforcing Materials.
  20. Sundaram, B. (2011). Monitoring of FRP strengthened concrete structures using FBG sensors, Procedia Engineering, 14, 1549-1556 https://doi.org/10.1016/j.proeng.2011.07.195
  21. Wang, B. (2009). Strain monitoring of RC members strengthened with smart NSM FRP bars, Construction and Building Materials, 23(4), 1698-1711. https://doi.org/10.1016/j.conbuildmat.2008.07.027
  22. Wang, C., & Cheng, L. (2014). Use of fiber bragg grating sensors for monitoring concrete structures with prestressed near-surface mounted carbon fiberreinforcement polymer strips, Journal of Intelligent Material System and Structure. 25(2), 164-173. https://doi.org/10.1177/1045389X13489364