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Title |
Experimental Study on the Shear Strength of Precast Concrete Composite Beams Subjected to Positive and Negative Moments
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Authors |
박연주(Yeon-ju Park) ; 이문석(Moon-seok Lee) ; 배백일(Beak-Il Bea) ; 최현기(Hyun-Ki Choi) ; 최창식(Chang-Sik Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.5.437 |
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Keywords |
프리캐스트 콘크리트; 합성보; 정모멘트; 부모멘트 precast concrete; composite beam; positive moments; negative moments |
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Abstract |
This study experimentally analyzed the impact of shear reinforcement ratio and positive/negative bending moments on the shear strength of precast (PC) and cast-in-place (CIP) concrete composite beams. The shear performance of composite beams with separate casting was evaluated using eight specimens with identical reinforcement layouts: four monolithically cast, and four separately cast. All specimens were designed to induce vertical shear failure by having high longitudinal reinforcement ratios and high horizontal shear strengths. The experiments were conducted using 4-point loading to assess the effect of the shear reinforcement ratio on the vertical shear strength of the PC and CIP concrete composite beams. The results showed that among the separately cast specimens, the specimen under negative moment with lower transverse reinforcement ratio had higher shear strength compared to the specimen under positive moment. The moment direction influenced the shear deformation and crack patterns. Additionally, the experimental results were compared with current design codes to evaluate shear performance.
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