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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.
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.
전찬용(Chanyong Zun),김재한(Jaehan Kim),목형수(Hyungsoo Mok),최규하(Gyuha Choe),이정민(Jungmin Lee),김상훈(Sanghoon Kim),김태훈(Taehoon Kim) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
The actuators of anti-vibration system(AVS) can be separated into several types: piezoelectric actuators, pneumatic springs, cylinders, rotating motor and linear motor. The last one has some advantages, such as low noise, low vibration, simpler configuration and possibility of direct drive. The voice coil motor(VCM) is one type of linear motor, originally used in speaker system. VCM actuators are usually used in occasions that rapid and controlled motion of devices are required. In this paper, a controller which satisfies system specification(e.g. current controller bandwidth) within whole operation range is designed. For that objective, parameters as position were initially obtained with 3D FEM analysis and motor modeling was performed. A current controller in 2-axis VCM drive system was designed and then performance of the proposed controller was verified with simulation using Simplorer and an experimental result.
철근콘크리트 프레임 및 전단벽체의 경계기둥 띠철근비 변화에 따른 구조성능 평가
신종학,하기주,전찬목 한국콘크리트학회 1998 콘크리트학회지 Vol.10 No.6
본 연구는 수직하중과 정.부 수평하중이 동시에 작용하는 순수강접 프레임과 완전강접 바벨형 철근콘크리트 전단벽 시험체의 경계기둥 띠철근비를 주요변수로 하여 총 10개의시험체를 실물 크기의 약 1/3로 축소 모델화하여 제작한 후, 구조성능 평가를 위한 실험을 실시하여 이력거동 특성, 수평강성 및 최대내력,파괴형태, 연성능력등을 비교 고찰하여 다음과 같은 결론을 얻었다. 순수강접 프레임 및 완전강접 바벨형 전단벽 시헴체의 경우, 각 시험체의 실험을 통하여 구한 이력거동곡선을 비교 고찰한 결과 기둥의 띠철근비가 클수록 최대하중에 도달한 후 강도저하 현상이 서서히 진행되었고, 연성적인 파괴형태를 나타내었다. 완전강접 바벨형 전단벽 시험체의 경우, 좌우기둥의 띠철근비가 적은 시험체는 비교적 띠철근비가 큰 시험체에 비하여 최종 파괴시의 파괴형태는 사인장 균열에 의해 지배됨을 규명할 수 있었다. 완전강접 바벨형 전단벽 시험체의 초대수평내력은 순수강접 프레임 시험체의최대수평내력보다 약 5.47~7.95배 증가하였다. Ten reinforced concrete rigid frames and infilled shear wall frames were tested under both vertical and cyclic loadings. Experiments were carried out to evaluate the structural performance of such test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility etc. under load reversals. All the specimens were modeledin one-third scale size. Based on the test results reported in this study, the follwing conclusions can be made. For the rigid frame type and the fully rigid babel type shear wall specimens, the hysteresis diagrams indicate that the degradations of their strength were developed slowly beyond maximum carrying capacity. It was shown that when the hoop reinforcement ratio became higher, the energy dissipation capacity became larger and the failure mode became ductile. The specimens designed by the less hoop reinforcement for the fully rigid babel type shear wall, were mainly failed due to diagonal crack in comparison with the specimens designed by the larger hoop reinforcement ratio. Maximum horizontal resisting moment capacity of speciment designed by the fully rigid babel shear wall were increased by 5.47~7.95 times in comparison with the rigid frame type.