매입형 CFRP Rod와 CFRP시트를 활용한 RC 외부 보-기둥 접합부의 내진성능 평가 및 개선
Improvement and Evaluation of Seismic Performance of Reinforced Concrete Exterior Beam-Column Joints using Embedded CFRP Rods and CFRP Sheets
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초록
본 연구에서는 기존 철근콘크리트 건물의 보-기둥 접합부의 내진성능의 개선을 위해 보-기둥 접합부 영역을 FRP보강재(매입형 CFRPRod, CFRP시트)를 사용하여 보강한 후 내진성능을 평가하였다. 총 6개의 실험체를 제작하고 실험을 수행하여 내진성능을 평가하였으며,본 연구의 실험결과를 근거로 다음과 같은 결론을 얻었다. 기존 철근콘크리트 보-기둥 접합부의 접합부 영역을 보강한 결과, 초기 재하시접합부 영역의 균열억제 효과와 재하 전 과정을 통하여 보강재의 구속효과로 인하여 균열억제 효과가 커서 안정적인 파괴형태 및 내력향상효과를 나타내었다. 매입형 CFRP Rod와 CFRP시트를 활용한 RC 외부 보-기둥 접합부 실험체 RBCJ-SRC2는 표준실험체 RBCJ와 비교하여 변위연성4,7에서 각각 최대 내력은 1.97배, 에너지소산능력은 2.08배 증가하였다. 또한, 실험체 RBCJ-SR시리즈와 비교하여 최대내력이 1.09~1.11배증가하였다. 그리고 실험체 RBCJ-CS, RBCJ-SR시리즈, RBCJ-SRC2는 변위연성 5, 6에서 표준실험체 RBCJ 보다 에너지소산능력이1.10~2.30배 증가하였다. 그리고 에너지소산능력은 변위연성 4에서 13.0~14.4% 증가하였다.
Abstract
In this study, experimental research was carried out to evaluate and improve the seismic performance of reinforced concretebeam-column joint regions using strengthening materials (embedded CFRP rod and CFRP sheet) in existing reinforced concretebuilding. Therefore it was constructed and tested six specimens retrofitting the beam-column joint regions using such retrofittingmaterials. Specimens, designed by retrofitting the beam-column joint regions of existing reinforced concrete building, were showed thestable failure mode and increase of load-carrying capacity due to the effect of crack control at the times of initial loading andconfinement of retrofitting materials during testing. Specimens RBCJ-SRC2, designed by the retrofitting of CFRP Rod and CFRP Sheet in reinforecd beam-column joint regionswere increased its maximum load carrying capacity by 1.97 times and its energy dissipation capacity by 2.08 times in comparisonwith standard specimen RBCJ for a displacement ductility of 4 and 7. Also, specimens RBCJ-SRC2 were increased its maximumload carrying capacity by 1.09~1.11 times in comparison with specimen RBCJ-SR series. And Specimens RBCJ-CS, RBCJ-SRseries, RBCJ-SRC2 were increased its energy dissipation capacity by 1.10~2.30 times in comparison with standard specimen RBCJfor a displacement ductility of 5, 6.
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