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Title |
Structural Performance of Flat-Plate Slab?Column Connections with Different Shear-Reinforcement Configurations
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Authors |
한국인(Guk-In Han) ; 김동환(Dong-Hwan Kim) ; 조민수(Min-Su Jo) ; 임수아(Su-A Lim) ; 김길희(Kil-Hee Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.6.11 |
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Keywords |
무량판 슬래브-기둥 접합부; 뚫림전단; 삽입형 전단보강근; 전단보강상세; 인장 막작용 Flat plate slab-column connection; Punching-shear; Embedded shear reinforcement; shear reinforcement detailing; Tensile-membrane action |
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Abstract |
Brittle punching-shear failure remains the governing limit state in flat-plate slab?column connections. This experimental study investigates the effect of shear-reinforcement configuration on punching resistance, ductility, and failure behavior. Four half-scale specimens were tested under concentric column loading: one unreinforced reference slab and three specimens reinforced with shear bars arranged in orthogonal, radial, and diagonal-hoop configurations (reinforcement ratio ρsr ? 0.5?1.0%). Structural responses such as load?displacement behavior, reinforcement strain, and crack patterns were evaluated. While all configurations produced only a modest increase in initial punching strength (3?8% above the reference), they significantly enhanced post-peak ductility, with ultimate rotation capacities increasing by 2.1?2.4 times. The failure mode transitioned from brittle cone breakout to a ductile crushing governed by tensile-membrane action. Comparisons with predictions from KDS 14-2025, ACI 318-19, and Eurocode 2 revealed that existing design formulas overestimated strength by 15?28%, primarily due to overreliance on flexural reinforcement ratio and neglect of configuration-induced membrane effects. The findings highlight the need for refined design provisions that explicitly incorporate the influence of reinforcement configuration on punching performance.
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