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An experimental study on the flexural bonding characteristic of a concrete beam reinforced with a GFRP rebar

  • Structural Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

This study was conducted to examine the bond strength of a beam reinforced with a GFRP (Glass Fiber Reinforced Polymer) rebar through a four-point bending test, adopting the British standard. The variables were made to have a bonding length 5 times (5 db), 10 times (10 db), and 15 times (15 db) that of the nominal diameter of a GFRP rebar. This was done to analyze the relationship between the bonding strength and the slip. The results of the test reveal that pull-out failure was dominant in the 5 db and 10db specimens. Both patterns of the pull-out failure and concrete-splitting failure appeared in the 10 db specimen. On the other hand, the 15db specimen showed only concrete-splitting failure at the end of its bonding length. Therefore, it was proven in this study that the available bonding length of GFRP rebar under a bending condition in a static test is over 15 db. Further research should be conducted on this subject, though, particularly a fatigue bending test and an FEM (Finite Element Method) parameter study, and a bonding model must be developed.

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Authors and Affiliations

  1. Gyeongnam National University of Science and Technology, Jinju, 660-758, Korea

    Hongseob Oh

  2. Dept. of Civil Engineering, Hanyang University, Ansan, 426-791, Korea

    Jongsung Sim & Hyuckwoo Kwon

  3. Sampyo Construction & Engineering Co. Ltd., Seoul, 110-733, Korea

    Taesung Kang

Authors
  1. Hongseob Oh
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  2. Jongsung Sim
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  3. Taesung Kang
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  4. Hyuckwoo Kwon
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Correspondence to Hyuckwoo Kwon.

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Oh, H., Sim, J., Kang, T. et al. An experimental study on the flexural bonding characteristic of a concrete beam reinforced with a GFRP rebar. KSCE J Civ Eng 15, 1245–1251 (2011). https://doi.org/10.1007/s12205-011-1018-y

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  • DOI: https://doi.org/10.1007/s12205-011-1018-y

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