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Title |
Bond Behavior of Beam Reinforcement Passing Through Interior Beam-Column Joints According to Concrete Compressive Strength
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Authors |
강성원(Seong-Won Kang) ; 김동환(Dong-Hwan Kim) ; 조민수(Min-Su Jo) ; 김형국(Hyeong-Gook Kim) ; 김길희(Kil-Hee Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.6.102 |
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Keywords |
콘크리트 압축 강도; 내부 보-기둥 접합부; 보 주철근; 부착 강도 Concrete Compressive Strength; Interior Beam-Column Joint; Beam Reinforcement; Bond Strength |
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Abstract |
Bond failure of longitudinal beam reinforcement passing through interior beam-column joints in reinforced concrete (RC) structures critically affects structural safety under cyclic loading. This study investigates the effect of concrete compressive strength on bond strength and evaluated the bond behavior of such reinforcement through experiments on eight RC beam?column joint specimens. To accurately simulate the stress state within the interior joint, tensile force was applied to the beam reinforcement at one end, while compressive force was applied to both the reinforcement and the beam cross-section at the opposite end. The experimental program examined the bond stress?slip relationship and the strain distribution along the beam reinforcement. All specimens were detailed to satisfy the column width requirements specified in KDS 14 20 80; however, bond failure was observed in several specimens, indicating that the current code provisions may not be sufficient to prevent bond deterioration under cyclic loading.
The bond failure initiated on the tension side and gradually progressed toward the compression side as the load increased. The use of high-strength concrete enhanced resistance to ring tension, delayed the deterioration of bond stress on the compression side, and consequently improved the overall bond performance of the joint.
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