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Title |
Bond Strength of Near-Surface-Mounted Square-Type Fiber-Reinforced Polymer (FRP) Reinforcement according to the Sectional Size and Bonded Length
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Authors |
서수연(Soo-Yeon Seo) ; 트란 하이 반(Hi Van Tran) ; 엠 후자이파 요누스 투르(M. Huzaifa Younus Toor) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.4.445 |
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Keywords |
표면매립보강된 CFRP; 부착파괴; 규격 및 부착길이; 둘레길이; 부착강도 near-surface-mounted (NSM) carbon fiber?reinforced polymer (CFRP); bond failure; size and bond length; perimeter length; bond strength |
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Abstract |
The purpose of this study was to investigate the bond failure behavior of near-surface-mounted (NSM) carbon fiber?reinforced polymer (CFRP) reinforcements with rectangular cross-sections, focusing on the effects of reinforcement size and bond length. To achieve this, nine concrete block specimens were prepared and strengthened with NSM CFRP reinforcements, then subjected to pull-out tests. The experimental variables included three different cross-sections of CFRP reinforcements, each tested with three different bond lengths. In the experiment, all specimens exhibited bond failure at the interface between the CFRP reinforcement and the concrete. Among the tested configurations, the thin plate-type reinforcements demonstrated the highest bond efficiency as bond length increased. Furthermore, the debonding strength, at which slippage at the bond interface begins to occur, was found to be proportional to the bond area, which is calculated as the product of the interface perimeter and the bond length. Based on regression analysis of this relationship, a suitable formula was proposed to appropriately predict the bond strength.
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