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Title |
Experimental Study on Indirect Load Transfer in Reinforced Concrete Deep Beams
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Authors |
이선호(Sunho Lee) ; 김상우(Sang-Woo Kim) ; 이정윤(Jung-Yoon Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.6.127 |
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Keywords |
깊은 보; 전단거동; 간접하중; 행거보강근; 철근콘크리트 Deep beam; Shear strength; Indirect loading; Hanger reinforcement; Reinforced concrete |
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Abstract |
This paper presents an experimental evaluation of the effect of hanger reinforcement on reinforced concrete deep beams subjected to indirect loading from a transverse beam. Experiments were conducted on a directly loaded specimen and two indirectly loaded specimens. One of the indirectly loaded specimens was reinforced with hangers to investigate the shear strength contribution and the change in load transfer path. The shear span-to-overall depth ratio of the main beam was consistently 1.5 for all specimens. Experimental results showed that the indirectly loaded specimen exhibited a shear strength up to 0.28 times that of the directly loaded one. However, the indirectly loaded specimen with hanger reinforcement showed a strength more than double that of the unreinforced specimen, confirming a recovery in shear performance. Additionally, the analysis of crack patterns and the concrete strut revealed that the hanger reinforcement successfully altered the load transfer path. Despite the strain in the hanger reinforcement approaching yield, its actual contribution to shear strength was limited to approximately 59% of the calculated value, indicating a failure to fully restore the shear strength to the level of the directly loaded specimen. This suggests that while hanger reinforcement is effective in enhancing the shear strength of deep beams under indirect loading, there are limitations to its performance.
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