강섬유 혼입률에 따른 철근콘크리트 외부 보-기둥 접합부의 내진성능에 대한 실험적 연구 (An Experimental Study on the Seismic Performance of Reinforced Concrete Exterior Beam-Column Joint with Steel Fiber Volume Fractions)

서지정보

· 발행기관 : 대한건축학회
· 수록지 정보 : 대한건축학회논문집 구조계 / 34권 / 4호 / 15 ~ 23페이지
· 저자명 : 이장재, 배백일, 최창식

초록

이 연구의 목표는 강섬유 혼입률에 따른 외부 보-기둥 접합부의 정착성능을 평가하기 위한 것이다. 이러한 목표를 위하여 강섬유 혼입률을 0, 1, 2%로 변수로 하였고, 각 실험체와 성능을 비교하였다. 실험결과, EX-HK-NJR-1,2 그리고 기준 실험체는 최대강도 발현 이전에 기둥 경계면에 철근의 항복을 경험하였지만 EX-HK-NJR-0(횡보강근이 배치되지 않은 경우)는 최대강도 발현 이후에 기둥 경계면 철근의 항복을 경험하였다. 따라서 강섬유 보강이 철근의 항복을 위한 요구정착길이를 줄여준다고 판단된다.

영어초록

The purpose of this study is to evaluate the anchorage capacity of longitudinal bars for reinforced concrete exterior beam - column joints with steel fiber volume fractions. For this purpose, the steel fiber volume fraction was set to 0, 1, 2%, and the performance was compared with that of each other specimens. According to the test results, the maximum strength of EX-HK-NJR-0 decreased by 13% compared with the control specimen and EX-HK-NJR-1 decreased by 3% compared to the control specimen. However, when 2% of steel fiber was mixed, the maximum strength increased about 56% compared to the control specimen. The energy dissipation capacity of EX-HK-NJR-0 (when no transverse steel bars are placed) decreased by 61% compared to the control specimen. In addition, the energy dissipation capacity of the specimens with a steel fiber content of 1% decreased by 5% and 2% increased by 94% compared to control specimen. EX-HK-NJR-1,2 and the control specimen EX-HK-JR-0 experienced yielding of the reinforcing bars at the column interface before maximum strength development. However, when the EX-HK-NJR-0, the reinforcing bars at the column interface experienced yielding after maximum strength development. Therefore, reinforcement of steel fiber is considered to reduce the required development length for yielding of steel bars.

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