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

• Published in: KSCE journal of civil engineering Vol. 15; no. 7; pp. 1245 - 1251
• Main Authors: Oh, Hongseob, Sim, Jongsung, Kang, Taesung, Kwon, Hyuckwoo
• Format: Journal Article
• Language: English
• Published: Heidelberg Korean Society of Civil Engineers 01.09.2011; Springer Nature B.V; 대한토목학회
• Subjects: Adhesion; Bend tests; Bending fatigue; Bonding; Bonding strength; Civil Engineering; Concrete; Deformation; Engineering; Fatigue failure; Fatigue tests; Fiber reinforced polymers; Finite element method; Geotechnical Engineering & Applied Earth Sciences; Glass fiber reinforced plastics; Glass fibres; Industrial Pollution Prevention; Mathematical models; Noise levels; Polymers; Rebar; Reinforcing steels; Splitting; Static tests; Structural Engineering; 토목공학; embedment length; concrete splitting; flexural bonding; GFRP rebar; pull-out
• ISSN: 1226-7988; 1976-3808
• DOI: 10.1007/s12205-011-1018-y

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 d b ), 10 times (10 d b ), and 15 times (15 d b ) 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 d b and 10d b specimens. Both patterns of the pull-out failure and concrete-splitting failure appeared in the 10 d b specimen. On the other hand, the 15d b 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 d b . 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.