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Title |
Flexural Behavior of One-Way Concrete Slab Reinforced with a Carbon Fiber-Reinforced Polymer (CFRP) Grid
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Authors |
박건하(Geon-Ha Park) ; 오지섭(Ji-Seob Oh) ; 우진석(Jin-Seok Woo) ; 윤현도(Hyun-Do Yun) ; 김선우(Sun-Woo Kim) ; 박완신(Wan-Shin Park) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.6.715 |
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Keywords |
CFRP 그리드; 콘크리트 슬래브; 1방향 슬래브; 균열; 휨 거동 CFRP grid; concrete slab; one-way slab; crack; flexural behavior |
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Abstract |
The flexural behavior of one-way concrete slabs reinforced with carbon fiber?reinforced polymer (CFRP) grids was investigated. To optimize the reinforcing effect of the CFRP grids, parameters such as strand width, thickness, and the number of grid layers were studied. Eight full-scale slab specimens?including six CFRP-reinforced and two RC slabs?were tested under a four-point bending setup. The experimental evaluation focused on crack development patterns, load?deflection and load?strain relationships, effective flexural stiffness, and flexural strength. The results indicated that slabs with lower reinforcement ratios, corresponding to minimum of 0.20 %, exhibited greater ultimate strain and more ductile failure behavior. In contrast, slabs with higher reinforcement ratios of 0.40 % demonstrated improved load capacity and enhanced mechanical performance relative to specimens reinforced with steel. Importantly, increasing CFRP strand width and the number of layers improved crack distribution and stress mitigation, whereas increasing CFRP strand thickness adversely affected bond performance, resulting in stress concentrations that ultimately degraded overall structural behavior. Furthermore, a comparison of flexural strength prediction models from ACI 440.11-22, KDS 14 20 68, and CSA S806-12 indicated that the selection of an appropriate model should be dependent on the reinforcement ratio, providing guidance for the optimized design of CFRP-reinforced slabs.
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