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고분자 복합재료로 횡보강된 철근콘크리트 기둥의 역학적 특성
이상윤 ( Lee Sang Youn ),오용복 ( Ohr Yong Bok ),권영웅 ( Kwon Young Wung ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
This paper concerns the strengthening effect using fiber composite materials like carbon, aramid and glass fiber sheet. To investigate the mechanical characteristics of 120mm-squared reinforced concrete columns confined by fiber composite materials, four kinds of concrete strength(422, 672, 974, 1148 kg/㎠) and three kinds of fiber composite materials(carbon, glass, aramid fiber sheet) were adopted as test variables. Increased with the compressive strength of concrete, strengthening effect by fiber composites has improved. But as compressive strength of concrete reaches highly, load carrying capacity decreases. Ductility index increases with plain concrete, but decreases with high strength concrete.
재하상태에서 측면 보강된 철근콘크리트 보의 탄소섬유쉬트 보강효과
김민수 ( Kim Min Su ),오용복 ( Ohr Yong Bok ),권영웅 ( Kwon Young Wung ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
It is necessary to rehabilitate and strengthen the damaged members to obtain sufficient design strength. However, the theoretical and practical methodology has not been established in terms of applying the strengthening techniques to the construction field. The target of this study is to compare and analyze the strengthening effect of damaged reinforced concrete beams under unloading and loading conditions through the simulation of strengthening condition in real structures. The conclusion of test results are as follows ; For the concrete beam wrapped at the side in addition to be strengthened at the bottom, the strength and stiffness increase. Although the flexural capacity depends on the strengthening method, it generally shows that the strength improve in the range of 22% to 39% in comparison with the specimen without strengthening. In case of applying the equation suggested by GangaRao & Vijay for the wrapped concrete beam, it must be modified because it is likely to overestimate the flexural capacity considering the height of wrapping as the width of concrete. Damaged beams, which are strengthened by CFS, is structurally efficient and show reduction of strength comparing with the specimen without strengthening but stiffness is increasing.