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Title |
Evaluation of Structural Performance of Reinforced Concrete Columns Confined with High-Strength Spiral-Type Transverse Reinforcement
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Authors |
김형국(Hyeong-Gook Kim) ; 정찬유(Chan-Yu Jeong) ; 강성원(Seong-Won Kang) ; 조우래(Woo-Rae Cho) ; 김길희(Kil-Hee Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.1.003 |
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Keywords |
띠철근 기둥; 고강도 나선철근; 횡보강근 보강량; 항복강도; 횡구속효과 tied column; high-strength spiral; transverse reinforcement; yield strength; confinement effect |
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Abstract |
In this study, three shear-dominated and three flexural-dominated reinforced concrete (RC) column specimens were fabricated to evaluate the effect of configuration, diameter, and yield strength of transverse reinforcement on the shear and flexural strength of RC columns. From cyclic loading tests, it was found that spiral-type transverse reinforcement showed similar performance in terms of the shear strength, control of diagonal tension cracks, and shear tensile failure induction of RC columns, compared with conventional rectangular transverse reinforcement when the yield strength of spiral-type transverse reinforcement was 600 MPa or less. Furthermore, when the amount of transverse reinforcement (pwfwu) was similar, the flexural strength of specimens with 500 MPa grade conventional rectangular transverse reinforcement and 600 MPa grade spiral-type transverse reinforcement was also similar. However, it was found that spiral-type transverse reinforcement with a yield strength of 700 MPa or more caused a decrease in the strength, ductility, and energy dissipation capacity of the specimen due to early softening of the core concrete before the yield of the steel. It showed that, for the application of high-strength spiral-type transverse reinforcement, additional verification as to which level of axial force and concrete compressive strength are variables is necessary.
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