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Title |
Evaluation of the Shear Strength of Reinforced Concrete Beams Strengthened with Fabric-Reinforced Cementitious Matrix Considering Bond Reduction
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Authors |
정찬서(Chanseo Jung) ; 서유재(Yujae Seo) ; 주현진(Hyunjin Ju) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.3.305 |
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Keywords |
전단강도; 철근콘크리트; FRCM; 부착파괴; 전단실험 데이터베이스 shear strength; reinforced concrete; FRCM; bond failure; shear test database |
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Abstract |
This study proposed a shear strength evaluation model for reinforced concrete beams strengthened with fabric reinforced cementitious matrix (FRCM). The proposed model considers the contributions of FRCM to shear strength based on the stiffness ratio between the shear reinforcement and the FRCM fibers. It also incorporates a bond reduction coefficient assuming of bond failure occurs prior to the fibers reaching their maximum tensile strength. The model was validated using specimen data collected from existing experimental studies. In addition, the test results were evaluated using the ACI 549 and ACI 440 guidelines and the outcomes were compared with the predictions of the proposed model. For specimens with shear reinforcement, the mean values of measured shear strength relative to those calculated by the proposed model, ACI 549.4R, and ACI 440.2R were 1.22, 1.22, and 1.15, respectively, with coefficients of variation of 26 %, 29 %, and 31 %. For speciems without shear reinforcement, the meanvalues were 1.59, 1.57, and 1.51, with coefficients of variation of 28 %, 31 %, and 38 %.
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