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반복하중을 받는 철근콘크리트 보-기둥 접합부의 매입형 탄소섬유봉 보강에 따른 내진성능 평가
하기주,이동렬,하민수,강현욱 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
In this study, experimental research was carried out to evaluate the earthquake-resistant performance of reinforced concrete beam-column joint using carbon fiber sheet and Embedded Carbon Fiber Bars materials in existing reinforced concrete building. Test result shows that retrofitting specimen(LBCJ-CRU, LBCJ-CRUS) designed by the improvement of seismic performance of reinforced concrete beam-column joints load-carrying capacities were increased 1.25~1.54 times in comparison with the standard specimen.
고강도 철근콘크리트 보-기둥 접합부의 내진성능 개선에 관한 실험적 연구
하기주,김진근,정란,Ha, Gee-Joo,Kim, Jin-Keun,Chung, Lan 한국콘크리트학회 1992 콘크리트학회지 Vol.4 No.1
최근 철근콘크리트 건축물의 초고층화 추세에 따라 건축물의 설계시에 고강도의 건설재료, 부재단면의 축소, 직경이 큰 철근의 사용이 요구되고 있다. 이에 따라 구조물의 다른 부위에 비하여 접합부 영역의 응력 집중현상이 커지고, 철근콘크리트 구조물에 고강도 콘크리트를 적용하므로써 고정하중의 감소, 부재단면의 축소, 부재내력의 증대, 장 스팬 구조물의 축소 가능, 경제성의 향상을 가져올 수 있는 장점으로 인하여, 철근콘크리트 구조물에 고강도 콘크리트의 이용은 더욱 증대할 것으로 예상된다. 그러나 고강도콘크리트는 보통 콘크리트와 다른 특성, 특히 최대내력이후의 강도저하가 현저하고 파괴성상이 취성적인 성질을 지니고 있으므로 실제 구조물에 적용하기 앞서 구조물의 안전성 측면에서 부재 실험을 통하여 정확한 역학적 특성을 규명할 필요가 있다. 따라서 본 연구에서는 반복 주기하중을 받는 고강도 철근콘크리트 보-기둥 접합부의 거동을 파악하고, 접합부의 내진성능 개선을 위한 새로운 설계방법을 실제 초고층 철근콘크리트 건축물의 설계를 위한 기초 자료로 제시하였다. With the increasing tendency to construct high rise reinforced concrete building~i, it is required to use high strength materIals, smaller member sections, and larger reinforcing bars, I t is generally recognized that under severe seismic loads beam column jomts may become more critical structural components than other structural elements. In a ductile momentresistmg reinforced concrete frame, the connection of bearncolumn must be capable of resistll1g the large lateral forces caused by seismic actions, The purpose of this experimental study is to evaluate and ll1vestigate the earthquake resistant perform ance of beam-colurrm subassemblies constructed with high-strength concrete cast by the concrete of com¬pressive strength of 700kg / cm2 subjected to reversed cyclic loadings. New approaches for moving the plastic hinging zone away from the column face and preventing the di¬agonal crack in the joint region are adopted to advance the earthquake-resistant performance of beam-column subassemblies using high-strengh concrete under severe earthquake-type loading. Exper¬imental results indicate that the modified new details which are introduced by intermediate reinforcement in the beam over a specific beam length adjacent to the joint are able to attain the stable hysteretic behavior and the enhancement of earthquake-resistant performance. Keywords: high strength concrete: beam-column Joints; seirnic loads(reversed cyclic loading) : earth¬quake-resistant performance; plastic hinge zone: diagonal crack: intermediate reinforce¬ment ; closed strirrup: hysteretic behavior: enhancement .
고인성섬유 복합모르타르 보강에 따른 고강도 철근콘크리트 내부 보-기둥 접합부의 내진성능 평가
하기주,홍건호,하재훈,이동근,김진환 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
In this study, experimental research was carried out to improve the seismic performance of reinforced concrete interior beam-column joints using high-ductile fiber-reinforced mortar. Test result shows that retrofitting specimen(IJNTP) designed by the improvement of earthquake-resistant performance and ductility of reinforced concrete interior beam-column joints, maximum load-carrying capacity of retrofitting specimen was increased 1.18 times in comparison to standard specimen. The retrofitting specimen show higher load-carrying capacity and stable hysteretic behavior although without hoop reinforcement in comparison with standard specimen. For such joint, it is considered efficiently to attain shear performance.
초기재령 강섬유보강 철근콘크리트 보의 구조성능 평가 및 개선
하기주,신종학,곽윤근,권칠성,Ha, Gee-Joo,Shin, Jong-Hack,Kwak, Yoon-Keun,Kwon, Chil-Sung 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.3
Reinforced concrete structures using early age concrete were result in the degradation of structural 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 structural 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 structural 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 0.75% of steel fiber incorporated, were showed the ductile behavior and failed slowly with flexure and flexure-shear. 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 0.75% of steel fiber incorporated, gets enough load carrying capacity and ductility. Increasing the percent of steel fiber incorporated(0.25~2.0%), the ultimate shear stress of each specimen were increased 12~40% than that of control specimen SSS.
국내 해체공사의 전문화를 위한 인력양성방안 : 교육용교재 개발을 중심으로
하기주(Ha, Gee-Joo),이동렬(Yi, Dong-Ryul),하재훈(Ha, Jae-Hoon),하민수(Ha, Min-Soo) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
The importance of the demolition will be sharply increased in the future construction industry due to the old age of facilities. However, in reality, the demolition industry in Korea has heavily relied on its empirical ways without experts from suitable education system. To solve these problems, we have analyzed the advanced foreign education text book for demolition experts to develop effective applications in Korea.
하기주(Ha, Gee-Joo),이동렬(Yi, Dong-Ryul),하영주(Ha, Yeong-Joo),하재훈(Ha, Jae-Hoon) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.1
This study will prepared the improvement of disaster causes 3E for the safety prevention of demolition construction. These were focus on three targets such as engineering, education, enforcement. Engineering improvement was involve in "development of equipment", educational improvement with "education training for safety, certification system" and enforcement improvement with "standard safety education improvement of demolition construction, specification setting and standard setting".