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Title |
Design of Hanger Reinforcement for Reinforced Concrete Deep Beams Subjected to Indirect Loading
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Authors |
김상우(Sang-Woo Kim) ; 이선호(Sunho Lee) ; 장명호(Myung-ho Jang) ; 이정윤(Jung-Yoon Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2026.30.1.91 |
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Keywords |
깊은 보; 전단강도; 간접하중; 행거보강근; 철근콘크리트 Deep beam; Shear strength; Indirect loading; Hanger reinforcement; Reinforced concrete |
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Abstract |
This study compares domestic and international structural design codes to prevent premature failure of reinforced concrete (RC) beams subjected to indirect loading and evaluates hanger reinforcement design approaches for structural design applications. A comparative review of ACI 318-25, CSA A23.3-24, and Eurocode 2 indicates that the CSA Code provides the most specific recommendations regarding the required amount and reinforcing region of hanger reinforcement intended to prevent strength reduction due to indirect loading. In addition, this study proposes a shear-based hanger reinforcement design concept that distinguishes between the shear contributions of concrete and hanger reinforcement by considering the shear strength reduction characteristics of RC deep beams subjected to indirect loading. Based on the proposed design concept, the applicability of the CSA provisions to RC deep beams under indirect loading was evaluated. The results show that when the soffit offset ratio between intersecting beams is 0.5, the amount of hanger reinforcement specified by the CSA Code is insufficient to prevent shear failure. In contrast, when the soffit offset ratio is 0.25 or less, the CSA provisions require up to 1.8 times more hanger reinforcement than that required to prevent shear strength reduction.
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