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Title |
Characteristics of Flexuarl-Shear Behavior of Beam using Demonstrated CFRP Rod
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Authors |
최소영(So-Yoeng Choi) ; 김일순(Il-Sun Kim) ; 최명성(Myoung-Sung Choi) ; 양은익(Eun-Ik Yang) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.5.86 |
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Keywords |
CFRP rod 보 부재; 변형 에너지; 파괴모드; 휨 전단 거동; 보강비; 전단 경간비 CFRP rod reinforced beam; Deformation energy; Failure mode; Fleuxral-Shear behavior; Reinforcement ratio; Shear span to depth ratio |
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Abstract |
Replacement of FRP rod as steel reinforcement has been attracted significantly to prevent the degradation of the concrete structure due to corrosion. So, the technology development to extend the structure's service life by improving FRP properties has been proceeded worldwide. Accordingly, it is necessary to develop Korea's CFRP rod and CFRP grid, including the manufacturing techniques to improve the properties of high-strength and high-stiffness. Moreover, the research should be conducted to evaluate the structural behavior of the beams using the CFRP rod or grid. This study investigates the flexural and shear behavior of reinforced concrete beam using demonstrated CFRP rod as reinforcement according to the reinforcement ratio and shear span to depth ratio. From the results, when the reinforcement ratio is out of a specific range, it is seemed that the effect on performance improvement of the beam using CFRP rod is cancelled or not significant. Meanwhile, when the CFRP rod was used as reinforcement, the possibility of shear failure occurred, even steel stirrups were installed in the beam with CFRP rod as tensile reinforcement according to the Korean Design Standard. Therefore, when the CFRP rod is used as tensile reinforcement in a beam, it should be prepared that a specific limitation of reinforcement ratio and an investigation against shear failure. Also, the ductility of the beam using the CFRP rod is determined by the deformation energy evaluation method. So, the ductility should be investigated by applying the deformation energy evaluation method that reflects the structural behavior of the beam.
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