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변형경화형 시멘트 복합체로 보-기둥 접합부가 보강된 전단항복형 철근콘크리트 보의 구조성능
장광수(Jang Gwang-Soo),송선화(Song Seon-Hwa),김윤수(Kim Yun-Su),김선우(Kim Sun-Woo),김용철(Kim Yong-Cheol),윤현도(Yun Hyun-Do) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
It has been shown that many reinforced concrete structures designed without seismic details have experienced brittle shear failures in the beam-column joint area and resulted in large permanent deformations and structural collapse. In this study, experimental investigations into the performance of exterior reinforced concrete beam-column joints strengthened with the strain-hardening cementitous composite(SHCC) reinforced under cyclic loading were presented. The properties of reinforcing fiber, as tensile strength, aspect ratio and elastic modulus, have great effect on the fracture behavior of SHCC. The research emphasis is on the mechanical properties of SHCC made in Polyvinyl alcohol(PVA), Polyethylene (PE), and how this affects the composite property, and ultimately its strain-hardening performance. Three beam-column joint specimens were tested to investigate behaviors of each specimen under cyclic load and to compare performances of seismic retrofit. According to the experimental study, the retrofit strengthened with the SHCC provides significant improvements of flexural capacity and ductility of beam-column joints originally built without seismic details.
중심축하중을 받는 순환골재 철근콘크리트 기둥의 내력평가
장광수(Jang Gwang-Soo),남상현(Nam Sang-Hyun),윤현도(Yun Hyun-Do),최기선(Choi Ki-Sun),유영찬(You Young-Chan),김긍환(Kim Keung-Hwan) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
In this study, full-scaled reinforced concrete columns were tested to evaluate the effects of replacement level of recycled aggregate on compressive behavior. The ready mixed concrete with specified compressive strength of 30㎫ were prepared with different replacement percentages of recycled aggregates. To do this, we have conducted tests on five 400㎜×400㎜×1800㎜ reinforced recycled aggregate concrete columns and tested under uniaxial load. The compressive behaviors of the reinforced concrete columns were described in terms of load-displacement relationship and comparison of the provision of KCI code. Also, to understand the behavior of core concrete, the stress-strain curves obtained from experiments were compared with existing models by Modified Kent and Park, Mander.
소신호 안정도를 고려한 확률론적 신뢰도 평가 및 몬테카틀로 시뮬레이션을 통한 신뢰도 평가 tool의 구현
장광수(Gwang-Soo Jang),김유창(Yu-Chang Kim),정하섭(Ha-Sub Jung),박종근(Jong Keun Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
본 논문에서는 계통의 불확실성을 고려한 확률론적인 방법으로 전력계통의 신뢰도를 평가한다. 발전기 3 state modeling 및 부하의 정규분포 곡선으로 확률론 신뢰도 평가 모델을 가정하였다. 그리하여 Adequacy 및 계통의 전압 및 송전선제약 조건 외에도, 소신호 안정도 항목을 추가하여 보다 동적인 측면에서의 신뢰도 평가가 이루어지도록 하였다. 이러한 평가 방법의 결과에 의하여 각 평가 항목 간의 비율을 비교하였으며, 이를 통한 PSS의 설치 위치 선정의 근거를 마련하였다. 모의 방법은 Monte Carlo Simulation방법을 사용하였으며, WSCC 3기 9모선과 New England 10기 39모선을 모의계통으로 하였다.
직접인장을 받는 합성섬유보강 고인성 시멘트 복합체의 손상평가
장광수 ( Jang Gwang-soo ),김윤수 ( Kim Yun-soo ),전에스더 ( Jeon Esther ),박완신 ( Park Wan-shin ),윤현도 ( Yun Hyun-do ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
HPFRCC(High performance fiber-reinforced cementitious composite) shows the inhibit of cracks within the cement matrix, and formed a lot of multiple cracks. For the effective design and evaluation of HPFRCC, according to the different material characteristics that makes a study of the fiber and cement matrix interaction between the behaviors and characteristics of the destruction is needed. Characterization of AE (Acoustic Emission) can be demonstrated the micro damage which it is not discovered from visual observation, and it become known to an advantage that was clearly discriminated from the existing methods. In this study, the correlations between AE signal and result of the direct tensile response of HPFRCC. For these purpose, three kind of fiber were used: PET2.0%, PET1.5+PE0.5%, PET1.5%+PVA0.5%. The results show the direct tensile response of HPFRCC, PET-PE specimen has multiple cracks and high strength than specimens with PET fibers. According to the results of test, the AE technique is a useful method in damage assessment of HPFRCC under direct tensile loading.