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한국콘크리트학회|IJCSM 2021년 11월

논문명 Seismic Retrofitting of RC Circular Columns Using Carbon Fiber, Glass Fiber, or Ductile PET Fiber
저자명 (Donguk Choi) ; (Seongwon Hong) ; (Myung-Kwan Lim) ; (Sang-Su Ha) ; (Sorrasak Vachirapanyakun)
발행사 한국콘크리트학회
수록사항 IJCSM, Vol.15 No.6 (2021-11)
페이지 시작페이지(779) 총페이지(20)
ISSN 1976-0485
주제분류 재료 / 구조
주제어 ; Axial stiffness; Confined concrete; Ductile fiber; Hybrid fiber; Section analysis
요약2 The effectiveness of seismic retrofitting using three different fibers-carbon fiber (CF), glass fiber (GF), polyethylene terephthalate (PET) fiber-and a fiber combination of aramid fiber (AF) and PET fiber (called hybrid fiber reinforced polymer (HF)) wrapped on reinforced concrete (RC) circular columns was experimentally evaluated. A total of 11 RC circular columns were tested: three control columns and eight retrofitted columns in three different test groups. The purpose of fiber wrapping was flexural strength improvement as well as enhancement of rotational capacity in the plastic hinge region. Mechanical properties of CF, GF, AF, and PET were first defined; that is, CF, GF, and AF exhibited linear stress-strain behavior with limited ultimate strain capacity typically less than 3%, while ductile PET exhibited as much as 15% strain and non-linear stress-strain behavior with a very low elastic modulus. In the RC column tests, all three different fibers and the AF+PET fiber combination were effective in enhancing the strength and ductility but resulted in different structural behaviors and failure modes depending on the fiber type and the fiber amount used. The column sections were then analytically studied by section analysis using the behavior of confined concrete, the non-linear relationship of fiber-reinforced polymer (FRP), and the actual material properties of reinforcement. The analytical and experimental results revealed that ductile PET is beneficial, as it demonstrates more ductile behavior with a degree of strength enhancement similar to that of CF and GF.
소장처 한국콘크리트학회
언어 영어
DOI https://doi.org/10.1186/s40069-021-00484-7