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곽윤근(Kwak Yoon-Keun),권성환(Kwon Sung-Hwan) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
During construction or occupancy, the SFRM(spray-applied fire resistive material) may become damaged. Steel column with damaged SFRM exhibit reduced structural performance due to the localized effects of elevated temperature during fire events. Structural analysis was performed to elevate the influence of temperature on column axial load behavior. Thus, the fire load behavior of steel columns with removed or reduced SFRM needs to be examined to predict fire induced structural damage. Its analysis was performed using three steel columns [H-250×250×9×14, H-350×350×12×19, and H-428×407×20×35]. The variables were removed thickness or length on the flange, exposure time, and column weight.
고성능 섬유보강 RC 보의 전단강도 설계식 개발에 관한 연구
곽윤근,권철성,이헌석,김우석,Kwak, Yoon-Keun,Kwon, Cheol-Sung,Lee, Heon-Seok,Kim, Woo-Suk 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.3
This paper deals with the shear strengthening effect of reinforced concrete (RC) beams strengthened with high-performance fiber sheets. There are many kinds of high-performance fibers, the high-performance fibers used in this study are carbon fibers. Fifteen strengthened RC beams, including a control beam, were experimentally evaluated to determine the improvements in shear strength. Test parameters were the strengthening ratios and strengthening methods of carbon fiber sheets (I-S, I-W, U-S, and U-W type). RC beams strengthened with carbon fiber sheets were tested under four-point loads. Considering strengthening ratios and strengthening methods of carbon fiber sheets, shear capacity and failure mode of test specimens were evaluated. The results show that the shear capacity of beams strengthened with carbon fiber sheets are approximately 28.8% in I-S type, 20.5% in I-W type, 26% in U-S type, and 28.70% in U-W type higher than that of the control beam. The results of previous tests by other researchers were reviewed to evaluate the shear strength of RC beams strengthened with carbon fiber sheets. Existing equations for predicting the shear strength of such beams were examined, and a new equation based on empirical observations was proposed. The proposed equation gave accurate estimates for the 84 shear specimens evaluated.
보-기둥 접합부에서 강섬유보강 콘크리트의 효율성에 관한 연구
곽윤근(Kwak Yoon-Keun),최현태(Choi Hyun-Tai),권우현(Kwon Woo-Hyun),김우석(Kim Woo-Suk),강현구(Kang Thomas H.-K) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.9
For the sufficient strength and ductile behavior of RC beam-column joints, closely-spaced lateral confinement reinforcement is required by seismic design codes. However, such seismic design often hinders the economic efficiency and constructability of a structure. The use of steel fibers in RC beam-column joints can improve the cost effectiveness and overcome fabrication complications, such as congested reinforcement details and associated poor concrete placement, without altering its seismic performance. To investigate the effect of steel fibers in RC beam-column joints, an experimental study was carried out under seismic loading conditions. A total of six half-scale joint specimens with seismic details or replacing steel fibers were subjected to three reversed cycles at each drift level up to 6% lateral drift ratio. The variables studied in this investigation are the joint transverse reinforcement amount and steel fiber volume fraction (0, 1, and 1.5%). The results of tests show that lateral load capacity, energy dissipation capacity, shear strength and ductility, and drift capacity are improved with the application of steel fibers of 1.5% but with the same configuration for the rest of the details. Also, a detailed analysis of both global and local data reveals the possibility of substituting steel fibers for some of the transverse reinforcement.
PSD 센서를 이용한 구조로봇의 장애물 탐지 및 주행 모드의 결정
최근하(Keun-Ha Choi),정해관(Hae-Kwan Jeong),곽윤근(Yoon-Keun Kwak) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Vision cameras are heavily relied upon for obstacle detection of the rescue robot in disaster site. However disaster areas are generally dark and filled with dust, smoke and gas therefore difficult to see in. It is difficult to decide the behavior of a rescue robot endowed with multi-driving mode, adapted to the terrain to traverse. This paper presents new method of obstacle detection using PSD infrared sensor and driving mode decision for rescue robot that has a variable geometry single-track mechanism. This system computed the obstacle height and angle from distance between robot and obstacle, PSD sensor. By the information, rescue robot can overcome the obstacles that translate the variable tracks on the best suited mode. It can improve the ability to overcome obstacle, like stairs and slope.