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고성능 리모델링기술을 활용한철근콘크리트 골조의 내진성능 평가 및 개선
하기주,이동렬,김창석 대한건축학회지회연합회 2024 대한건축학회연합논문집 Vol.26 No.2
Four reinforced concrete frame using advanced remodelling technology, which is designed by the conventional method, remodelling technology of ALC panel, X-type steel bracing system with and without steel frame in R/C frame, were tested under both vertical and cyclic loadings, Experimental programs were carried out to evaluate and improve the seismic performance of such test specimens, such as the hysteretic behavior, the maximum horizontal strength, energy dissipation capacity, and crack propagation etc. under load reversals. All the specimens were modeled in one-third scale size. Based on the test results reported in this study, the following conclusions can be made. The maximum load-carrying capacity of specimens(RFAR, RFXB, RFXB-F) designed by the advanced remodelling technology for standard specimen(SRF) were increased 1.46~4.27 times in comparison with the standard specimen(SRF). Energy dissipation capacity of specimens designed by the improving of seismic performance were increased 2.14~4.72 times in comparison with the standard specimen(SRF).
건설공사의 Life Cycle Cost 적용현황 및 활용방안 연구
하기주,최민권,이동렬,이창희,고은형,하민수,하재훈 대한건축학회지회연합회 2007 대한건축학회지회연합회 학술발표대회논문집 Vol.2007 No.1
The purpose of this study is to suggest advanced applications of life cycle cost analysis for evaluating various alternatives in construction projects. For this study, we have surveyed and analyzed current laws and regulations, and state-of-the-art methods on the life cycle cost analysis for better cost-benefit analysis framework.
철근콘크리트 구조물의 열화방지를 위한 보호마감 복합화 공법의 개발
河基柱,申鍾學,崔民權 慶一大學校 2002 論文集 Vol.18 No.-
In this study, experimental research was carried out to develop protective finishing, coating materials and new hybrid technique for deteriorating prevention and high durability in concrete structures. It had sufficiently recommended performance for the protective finishing method of concrete structures through testings. This is more progressive double membrane method than single membrane type designed by conventional method. It was found that this hybrid construction method had very excellent performance to improve the durability of existing concrete structures and attain the beauty of concrete structures.
반복 주기하중을 고강도철근콘크리트 보-기둥 접합부의 거동에 관한 실험적 연구
하기주 경일대학교 산업기술연구소 1992 産業技術硏究所 論文集 Vol.2 No.-
The objective of this experimental research is to study the behavior of high-strength concrete beam-column subassemblies subjected to reversed cyclic loadings. The experimental results from reversed cyclic loadings on seven beam-column subassemblies constructed with high-strength concrete are presented. The primary variables were the concrete strength, the loading rate, and the ratio of the column to beam flexural capacity. Finally, it is concluded that the test results, which is designed by ACI Building Code(318-83) and ACI-ASCE 352 Recommendation(1985) based on normal concrete test results is comparatively satisfactory behaviors under moderate displacement ductility. The hysteretic behavior of reinforced concrete members subjected to repeated reversed loading depends on the concrete strength. The more concrete strength was, the more stiffness and strength degradation for displacement ductilities of 7 or higher was developed due to brittleness of high-strength concrete.
고층복합구조에 적용가능한 슬림형 플랫플레이트의 전단성능 개선
하기주,신종학,최민권 대한건축학회지회연합회 2005 대한건축학회연합논문집 Vol.7 No.1
Recently the construction of high-rise hybrid type building is progressively increased as the social demands. It is significantly important factors such as economy, the safety of structure, and the flexibility of internal space. Therefore new hybrid structural system, using slim flat plate system, is also required to be attained the reduction of story height, the flexibility and efficient use of space. The most suitable structural system is ,with the economy and flexibility, flat plate system in high-rise hybrid type building. But it was focused in the punching shear for high performance flat plate system in high-rise hybrid type building.Therefore, in the study, to develop the new flat-plate system with high ductile, durable, good performance for the applications. It was evaluated the shear performance in the critical region of slab-column connection. And then high performance flat plate system, designed by the economy and safety, was developed as a new technique in the application of high-rise hybrid type building.
초기재령 강섬유보강 철근콘크리트 보의 휨성능 평가 및 개선
河基柱,申鐘學 경일대학교 2001 論文集 Vol.17 No.-
Reinforced concrete structures using early age concrete were result in the degradation of flexural performance due to crack, overload, unexpected vibration and impact load. It demands urgently that reinforced concrete structure using early age concrete should be improved the serviceability and flexural performance with the application of new fiber materials. Therefore specimens, designed by the test varibles, such as with or without stirrup and percent of steel fiber incorporated, were constructed and tested to evaluate and develop the flexural performance of reinforced steel fiber concrete beam. Based on the test results reported in this study, the following conclusions are made. Specimens, designed by the over 0.5% of steel fiber incorporated, were showed the ductile behavior and failed slowly with flexure and flexure-shear in comparison with the standard specimen BSS. Comparing with the load-displacement relationship of specimen BSS, designed by the recommendations of the Ministry of Construction and Transportation, reinforced steel fiber concrete beam using early age concrete, over 0.5% of steel fiber incorporated, gets enough load carrying capacity and ductility. Increasing the percent of steel fiber incorporated(0.5∼2.0%), the ultimate shear stress of each specimen were increased 19∼60% than that of specimen SSS.
섬유시트와 매입형 CFRP Rod를 보강한 R/C 외부 보-기둥 접합부의 내진성능 평가 및 개선
하기주,하영주,강현욱 한국구조물진단유지관리공학회 2015 한국구조물진단유지관리공학회 논문집 Vol.19 No.2
본 연구에서는 기존 철근콘크리트 구조물 보-기둥 접합부의 내진성능의 개선을 위해 보-기둥 접합부 영역을 FRP보강재 (탄소섬유시트, 아라미드섬유시트, 매입형 CFRP Rod)를 사용하여 보강한 후 내진성능을 평가하였다. 총 7개의 실험체를 제작하고 실험을 수행하여 내진성능을 평가하였으며, 본 연구의 실험결과를 근거로 다음과 같은 결론을 얻었다. 기존 철근콘크리트 보-기둥 접합부의 접합부 영역을 보강한 결과, 초기 재하시 접합부 영역의 균열억제 효과와 재하 전 과정을 통하여보강재의 구속효과로 인하여 균열억제 효과가 커서 안정적인 파괴형태 및 내력향상 효과를 나타내었다. 매입형 CFRP Rod와 탄소섬유시트를 활용한 R/C 외부 보-기둥 접합부 실험체 LBCJ-CRUS는 표준실험체 LBCJ와 비교하여 변위연성4, 7에서 각각 최대내력은 1.54배, 에너지소산능력은 2.36배 증가하였다. 그리고 실험체 LBCJ-CS, LBCJ-AF시리즈는 변위연성 7에서 표준실험체 LBCJ 보다 에너지소산능력이 각각 2.04~2.34, 1.63~3.02배 증가하였다. In this study, experimental research was carried out to evaluate and improve the seismic performance of reinforced concrete beam-column joint regions using strengthening materials (CFRP sheet, AFRP sheet, embedded CFRP rod) in existing reinforced concrete structure. Therefore it was constructed and tested seven specimens retrofitting the beam-column joint regions using such retrofitting materials. Specimens, designed by retrofitting the beam-column joint regions of existing reinforced concrete structure, were showed the stable failure mode and increase of load-carrying capacity due to the effect of crack control at the times of initial loading and confinement of retrofitting materials during testing. Specimens LBCJ-CRUS, designed by the retrofitting of CFRP Rod and CFRP Sheet in reinforecd beam-column joint regions were increased its maximum load carrying capacity by 1.54 times and its energy dissipation capacity by 2.36 times in comparison with standard specimen LBCJ for a displacement ductility of 4 and 7. And Specimens LBCJ-CS, LBCJ-AF series were increased its energy dissipation capacity each by 2.04~2.34, 1.63~3.02 times in comparison with standard specimen LBCJ for a displacement ductility of 7.