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CFRP 보강시스템을 적용한 철근콘크리트 골조면내 전단벽의 내진성능 평가
하기주 ( Ha¸ Gee-joo ),이동렬 ( Yi¸ Dong-ryul ),하영주 ( Ha¸ Young-joo ),조효식 ( Cho¸ Hyo Sik ),전찬목 ( Jun¸ Chan Mok ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
지진하중을 받는 기존 철근콘크리트 건물의 내진성능을 개선하고 구조물의 안전성의 증대, 사용성의 향상 및 구조물의 수명을 연장시키기 위하여 CFRP 보강시스템을 적용한 철근콘크리트 골조면내 전단벽의 내진성능 개선기술을 제안하였다. 지진하중을 받는 철근콘크리트 골조면내 전단벽에 CFRP 보강시스템을 적용한 후 내진성능 평가를 위하여 3개의 표준적인 기존 철근콘크리트 골조면내 전단벽 및 CFRP 보강시스템을 적용한 실험체을 제작하고 실험 및 분석한 결과 최대내력 및 에너지소산능력이 각각 1.40, 1.79배 증가하였으며, 향후 실제 철근콘크리트 건물의 내진성능 개선 시 활용할 수 있을 것으로 판단된다.
全燦穆,河之雄,河基柱,申鍾學 慶一大學校 1996 論文集 Vol.13 No.2
Ten specimens were constructed and tested to investigate and evaluate the structural performance of the cracked reinforced concrete beam with the epoxy repair, the epoxy bonded steel plated, and carbon fiber sheets. Based on the test results, the following conclusions are made. 1) Epoxy-repaired specimens which were loaded with the repaired condition were not cracked in the comparision with its standard specimen at the same location. In epoxy-repaired specimen it was recommended that the cracked regions of test specimens were thoroughly investigated before epoxy repairs. 2) For epoxy-repaired specimens, test specimen(BEL), which was repaired with the loading condition, was increased the initial stiffness and carrying capacity in comparision with the test specimen BER under unloading conditios. 3) Reinforced concrete beams(BSM30, BCMS) with epoxy bonded steel plates and carbon fiber sheets were increased the strength and stiffness in comparision with standard specimen. It was indicated that proper repaired reinforced concrete beams were able to be developed the structural performance. Maximum carrying capacities of these specimens were higher 1.08∼0.25 times than the standard specimen 4) For the test specimens, strengthed with carbon fiber sheets, it was very good in the insurance of strength and stiffness, and showed a distinct difference in variance with the lenght of carbon fiber sheets, the difference of structural performance was found in the quality of domestic of foreign carbon fiber sheets. But it was thought that the domestic products was able to be used in repaired materials with the efforts of quality control.
全燦穆,權重培,申鍾學,河基柱 慶一大學校 1996 論文集 Vol.13 No.2
In this study, nine reinforced concrete infilled frames involved bare frames were tested during vertical and cyclic loads simultaneously. This test programs were carried to investigate the horizontal strength and the crack propagation in variance with hoop reinforcement ratio. All specimens were modeling in one-third scale size. In this experimental program structural performance of reinforced concrete shear wall were focus at connection types. Based on the test results, the following conclusions are made. (1) In fully rigid frame, increasing the ratio of hoop bar 2∼3 times on the basis of its ratio of in column(p??=0.196%). The horizontal strength of specimen did not varied, but the increased ductility of specimens were showed greatly at the final failure. (2) In the boundary column menber of reinforced concrete shear wall, increasing the ratio of hoop bar in two or three times, in the fully babel type, the shear and horizontal strength of specimens were increased 1.1-1.2 times than that of fully rigid frame. And infilled shear wall specimen were increased 1.17-1.27 times than that. (3) Fully rigid babel type shear wall specimens were increased 5.7∼8.0 times, and infilled shear wall specimens were increased about 4.0∼5.6 times in comparision with the full rigid frame.
철근콘크리트 전단벽체와 경계 기둥의 띠철근 보강에 따른 구조성능 평가
申鍾學,河基柱,全燦穆 慶一大學校 1997 論文集 Vol.14 No.2
Ten reinforced concrete rigid frames and infill shear wall frames involved bare frames were tested during vertical and cyclic loads simultaneously. Experrimental programs carried to investigate the horizontal strength, crack propagation and ductility etc. All specimens were modeling in one-third scale size. In this experimental program structural performance of reinforced concrete shear wall were focus at the variation of hoop reinforcement. From the above testing, We have the following conclusion. (1) It was not largely varied horizontal stress, in fully rigid frame the specimens(FB-2, 3, A, B, C), when the ratio of hoop bar, in both colums, were varied the horizontal stress and ductility did not varied. (2) The specimens(FB-2, 3) in fully figid frame, as the ratio of hoop bar, both columns, are increased, was caused main bending and shear crack in the capital and the base of column. But the specimens(FB-A, B, C) as the ratio of hoop bar of left columns are not increased, was caused compression failure and concentration of shear crack so that happen sudden collapse in the base of column. (3) In fully rigid babel type shear wall, specimens(FW-B, C) that make increased ration at right column. is larger about 1.5 times than specimens of is not varied specimen(FW-A) in ductility. (4) In fully rigid babel type shear wall specimen as the ratio of hoop bar is varied, the shear stress and the horizontal stress of the specimen that the ratio of hoop bar of boundary column is increased about 1.1∼1.2 times than those of specimens(FW-A, B, C).