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철근콘크리트 전단벽의 접합방식과 대각보강에 따른 내진성능 평가 및 개선
신종학,하기주,안준석,주정준,Shin, Jong-Hack,Ha, Gee-Joo,An, Joon-Suk,Ju, Jung-Jun 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.3
Six reinforced concrete shear wall, constructured with fully rigid, slit, and infilled types, were tested under both vertical and cyclic loadings. Experimental programs were carried out to evaluate the seismic performance of such test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility, under load reversals. All the specimens were modeled in one-third scale size. Based on the test results, the following conclusions can be made. For the diagonal reinforced slit and infilled shear wall specimens, it was found that the failure mode shows very effective crack control and crushing due to slippage prevention of boundary region and reduction of diagonal tension rathar than the brittle shear and diagonal tension failure. The ductility of specimens designed by the diagonal reinforcement for the slit and infilled shear wall was increased 1.72~1.81 times in comparison with the fully rigid shear wall frame. Maximum horizontal load-carrying capacity of specimens designed by the diagonal reinforcement ratio the slit and infilled shear wall was increased respectively by l.14 times and l.49 times in comparison with the standard fully rigid shear wall frame.
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.
초고층 철근콘크리트 건물에 적용 가능한 보-기둥 접합부의 내진성능 개선 기술 개발
하기주 ( Ha Gee Joo ),신종학 ( Shin Jong Hack ),최민권 ( Choe Min Kwon ),이영범 ( Lee Young Bum ),조효식 ( Cho Hyo Sik ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
In this paper, experimental research was carried out to study the hysteretic behavior of reinforced high-strength concrete beam-column joints designed by high performance techniques, such as application of high-strength concrete, reducing of joint regions damage, moving of beam plastic hinge, and steel fiber concrete. Specimens(HJAI, HJCI), designed by moving of beam plastic hinge and development of structural performance were sufficiently moved away 20cm, 30cm from the column face respectively due to adding supplemental intermediate longitudinal reinforcement over a specific length 1.5d and application of closed Solving the congestion of reinforcement and throughly placing of concrete in reinforced beam-column joint, specimens(HJRS1, HJRS2), replaced shear reinforcement into steel fiber concrete were showed stable hysteresis behavior, sufficient maximum load carrying capacity, and satisfactory crack pattern.
편심이 있는 철근콘크리트 보-기둥 접합부의 내진성능평가
하기주(Ha Gee-Joo),신종학(Shin Jong-Hack),하재훈(Ha Jae-Hoon),남영식(Nam Young-Sik),이동근(Lee Dong-Gun) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
In this dissertation, experimental program was carried out to study the hysteretic behavior of the eccentric reinforced concrete beam-column joints subjected to cyclic loading. The test results was as follow. The eccentric reinforced concrete beam-column joint, designed by the eccentricity, was increased maximum displacement ductility according to the increase of eccentricity in comparison to standard specimen. And it was also dissimilar to failure mode adjacent to joint region. maximum displacement ductility of each specimen, designed by the eccentricity, was increased 2.05∼2.10 times in comparison to standard specimen.
비선형 유한요소법에 의한 철근콘크리트 보의 보강에 따른 구조성능 평가
하기주 ( Ha Gee Joo ),신종학 ( Shin Jong Hack ),김광연 ( Kim Kwang Yeon ),이영범 ( Lee Young Bum ),홍석열 ( Hong Suk Youl ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
In this study, analytical results were compared with experimental results and estimated the results by analysis using non-linear finite element analysis method for existing reinforced concrete beams and steel plate or carbon fiber sheet strengthened reinforced concrete beams. In the case of specimens, strengthened with steel plate having the strengthening length which was reinforced 0.5m to each direction of its length starting from the lower center part of the beam and the strengthening thickness of 6mm, 9mm, 12mm(SS100-6, SS100-9, SS100-12), ultimate load-carrying capacity of each specimen are 18.5ton, 19ton, 20ton and increased about 12%, 15%, 21% compared with standard specimen(BLS-S). In the case of specimens, strengthened with carbon fiber sheet having the strengthening length which was reinforced 0.5m to each direction of its length starting from the lower center part of the beam and the strengthening sheet figures of 1, 3, 5(CS100-1, CS100-3,SS100-5), ultimate load-carrying capacity of each specimen are 18ton, 20ton, 21ton and increased about 8%, 21%, 27% compared with standard specimen(BLS-S). Therefore, the structural performance for reinforced concrete beams with strengthening method and quantity of steel plate and carbon fiber sheet can be estimated and after on, it is judged that the results of this study can be applied to analysis and design for reinforcing of reinforced concrete beams.
하기주 ( Ha Gee-joo ),신종학 ( Shin Jong-hack ),주정준 ( Ju Jung-jun ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 논문집 Vol.4 No.1
In this experimental program specimens, designed by the test variables, such as percentage of steel fiber incorporated, were constructed and tested to evaluate the flexural performance of reinforced steel fiber concrete beams. Based on the test results reported in this study, the following conclusions are made. Comparing with the load-displacement relationship of standard specimen, specimen over 0.5% of steel fiber incorporated, could be improved significantly flexural performance, such as capacity, ductility, and crack pattern. As increasing in quantity of steel fiber incorporated(0.5%~2.0%), the flexural strength of each specimen was shown the enhancement of 13%~40% in comparision with the standard specimen BSS.