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제진장치를 이용한 기존 건물의 내진성능 향상에 대한 기술동향 분석
이창환(Lee Chang-Hwan),우승기(Woo Seung-Ki),주영규(Ju Young-Kyu),김명한(Kim Myung-Han),정광량(Chung Kwang-Ryang),김상대(Kim Sang-Dae) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
Conventional seismic design concept is based on the ductility of structures, which requires the structures to undergo inelastic behavior. This leaves damage to the main structural components, and repairing the damaged structural components takes considerable costs and time. By using damping devices, the input energy can be absorbed by them, and the structural components can remain safe. This study analyzed several cases of adopting the damping devices in order to find out the effectiveness of the damping devices in improving seismic performance. Targeted cases are only metallic dampers and friction dampers. The criteria used to compare before and after of adopting the damping devices are interstory drift ratio, base shear, the portion of dissipated energy by the dampers, and stiffness of the structures.
카고메 시스템을 활용한 비내진 저층 RC 구조물의 내진성능평가
허무원,이상현,이범식 한국콘크리트학회 2020 콘크리트학회논문집 Vol.32 No.5
In this research, to improve the seismic performance of a low-rise RC building, the an externally retrofitting method to improve the seismic performance of a low-rise RC building was suggested. The efficacy of the presented method was empirically verified by conducting cyclic loading tests of practical frames extracted from a non-seismically designed RC building. As a result, in the it was found that in non-reinforced specimens, brittle shear failure occurred with a sharp drop in strength as the damage concentrated on the upper and lower parts of its the columns. However, the specimen retrofitted by using a Kagome damper showed an elliptical hysteresis, which has high-energy-absorbing capacity, with increase in strength and stiffness. Moreover, the damper improved energy dissipation by about 3.78 times due to the increases in strength and deformation capacity. By applying the suggested externally retrofitting method, it is expected that drift angle will be able to meet the standard of KBC 2016 to secure safety and improve strength of a low-rise RC buildings without seismic detailing.
실리콘 점성댐퍼의 속도의존성 거동에 대한 실험적 성능 평가
정인용,오진탁,류동일,류재호 한국강구조학회 2019 韓國鋼構造學會 論文集 Vol.31 No.5
In this paper, a viscous damper infilled with silicone gel was proposed that can replace conventional oil dampers. A series of experimental tests were conducted to verify the damping performance of the proposed device depending on the operating velocity of the piston rod. Test results showed that the force in the energy-dissipation device was kept constant regardless of the damper displacement and increased nonlinearly as the loading velocity increased. For the damper forces, effective stiffnesses, and energy dissipations measured five times repeatedly at each loading step, the ratios of deviations to average values were less than 2 %, which means that the proposed damper behave stably subject to repeated loading. Additionally, the equation for describing the force-velocity relationships of the device was suggested based on the test results. 본 논문에서는 오일 대신 실리콘 겔이 충진된 점성댐퍼의 성능을 평가하기 위한 실험적 연구가 진행되었다. 제안된 댐퍼의속도의존적인 특성을 확인하기 위해 0.5 mm/s에서 40 mm/s에 이르는 다양한 속도 하에서 댐퍼에 발생되는 하중을 계측하였으며 그 변화 경향을 분석하였다. 실험 결과, 제안된 실리콘 점성 댐퍼는 댐퍼의 변위 증가와는 무관하게 하중이 일정하게 유지되었으며, 댐퍼의작동 속도가 증가할수록 축방향 저항력이 비선형적으로 증가하는 특성을 나타냈다. 5회 반복 계측된 댐퍼의 하중, 유효강성 및 에너지소산량의 평균 대비 편차의 비율은 대부분 2 % 미만으로 계측되어 제안된 댐퍼의 안정적인 거동을 확인할 수 있었다. 또한, 실험 데이터에 근거하여 제안된 댐퍼의 속도에 따른 하중 크기를 정의할 수 있는 관계식을 제안하였다.
내진 및 연쇄붕괴 저항성능 향상을 위한 기존 구조물의 효율적인 보강방법에 관한 연구
김진구(Kim Jin-Koo),최현훈(Choi Hyun-Hoon),유지성(Yu Ji-Sung) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.2
Passive energy dissipation devices (PEDD) are generally used to reduce structural responses caused by earthquake or wind loads. This study presents combined system of rotational friction damper connected to cables to enhance both seismic and progressive collapse resisting capacity of existing structures. To this end 3-, 6-, and 15-story RC moment frames were designed considering only gravity loads. Rotational friction dampers were designed according to the capacity spectrum method (CSM) to satisfy given performance objectives against seismic load. Nonlinear dynamic analysis results showed that the structures retrofitted by rotational friction dampers showed superior performance against seismic load especially in the 3-story structure. It was also observed that the retrofitted structures showed more stable behavior against progressive collapse.