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최현훈(Choi Hyun-Hoon),김진구(Kim Jin-Koo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
To increase the effective damping force and to reduce the damper volume the magnifying system of the damper displacement such as toggle brace system and scissor-jack-damper configuration have been developed with increase in installation cost. In this study new installation scheme for dampers was proposed using cable. To verify the validity of the proposed method nonlinear dynamic analysis of model structures with viscoelastic dampers installed using the proposed configuration scheme was carried out. In the analysis three different earthquake records were used. According to the analysis results the proposed method resulted in significant reduction in the size of dampers compared with the conventional installation methods.
최현훈(Choi Hyun-Hoon),김진구(Kim Jin-Koo) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11
In general passive energy dissipation devices (PEDD) such as viscous, viscoelastic, and friction devices are installed using diagonal or chevron braces. To increase the effective damping force and to reduce the damper volume the magnifying system of the damper displacement such as toggle brace system and scissor-jack-damper configuration have been developed with increase in installation cost. In this study new installation scheme for PEDD was proposed using cables installed in such a way that relative displacement occurs between the cable and the structure when the structure is subjected to lateral load. The cables can be installed continuously or discretely between base and top story of the structure. To verify the validity of the proposed method nonlinear dynamic analysis of model structures with viscoelastic dampers installed using the proposed configuration scheme was carried out using three different earthquake records and two sinusoidal forces. According to the analysis results the proposed method resulted in significant reduction in the size of dampers compared with the conventional installation methods.
최현훈(Choi Hyun-Hoon),박경훈(Park Kyoung-Hoon),전용(Jeon Yong),김진구(Kim Jin-Koo) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.12
In this study experiments were carried out to investigate the progressive collapse resisting capacity of RC beam-column subassemblages designed with and without seismic load. The two-span subassemblages were designed as part of an eight-story RC moment resisting frame. The right interior column was designed 1.5 times as large in size as the middle interior column to take into account the continuation of the girder. Monotonically increasing load was applied at the middle column of the specimens and the force-displacement relationships were plotted. It was observed that the non-seismic designed specimen failed by crushing of concrete at the exterior column-girder joint before catenary action was activated. However the force-displacement relationship of the specimen designed for seismic load kept increasing after fracture of the girder lower re-bars near the middle column due to the catenary action of the upper re-bars. Based on the test results it was concluded that RC moment-resisting buildings designed per current design code might have significant resisting capacity against progressive collapse initiated by sudden loss of a column.
김진구,이영호,최현훈,Kim, Jin-Koo,Lee, Young-Ho,Choi, Hyun-Hoon 한국전산구조공학회 2008 한국전산구조공학회논문집 Vol.21 No.5
본 논문에서는 비선형 정적해석 및 동적해석을 이용하여 가새골조의 연쇄붕괴 저항능력을 평가하였다. 모두 아홉 개의 서로 다른 가새 형태를 고려하였으며, 모멘트골조의 해석 결과와 비교하였다 비탄성 정적해석 결과에 따르면 현행 기준에 따라 설계된 저층 가새골조는 1층 중앙에 위치한 기둥이 제거될 경우 연쇄붕괴 저항성능 기준을 만족하는 것으로 나타났으나 대부분 취성적인 파괴모드를 나타내었다. 특히 압축가새가 좌굴한 후 인장가새가 인장력을 발휘하기 전에 취약한 층의 기둥이 좌굴하는 것으로 나타냈다. Inverted-V형 가새골조의 경우가 가장 연성도 면에서 우수한 것으로 나타났다. 동적 해석 결과에 따르면 모든 가새골조는 중앙에 위치한 기둥이 제거될 경우 붕괴되지 않으며, 동일한 규모의 모멘트 저항골조에 비해 진동이나 처짐량이 작은 것으로 나타났다. In this study the progressive collapse potential of braced frames were investigated using the nonlinear static and dynamic analyses. All of nine different brace types were considered along with a special moment-resisting frame for comparison. According to the pushdown analysis results, most braced frames designed per current design codes satisfied the design guidelines for progressive collapse initiated by loss of a first story mid-column; however most model structures showed brittle failure mode. This was caused by buckling of columns after compressive braces buckled. Among the braced frames considered, the inverted- V type braced frames showed superior ductile behavior during progressive collapse. The nonlinear dynamic analysis results showed that all the braced frame model structures remained in stable condition after sudden removal of a column, and their deflections were less than that of the moment-resisting frame.
김진구,이승준,최현훈,Kim, Jin-Koo,Lee, Seung-Jun,Choi, Hyun-Hoon 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.5
본 논문에서는 비선형 동적해석방법을 이용하여 점성감쇠기가 설치된 철골조 건물의 연쇄붕괴 저항성능을 평가하였다. 감쇠기가 설치된 2경간 보-기둥 부분골조를 이용하여 주기 및 항복강도의 변화에 따른 감쇠력의 효과를 검토하였다. 해석 결과에 따르면 감쇠비가 증가할수록 기둥이 제거된 지점의 수직변위가 감소하는 것으로 나타났으며, 탄성시스템 뿐만 아니라 비탄성시스템에서도 효과가 있는 것으로 나타났다. 감쇠기가 설치된 15층 3경간 철골 모멘트골조의 비탄성해석을 통하여 감쇠기의 효과를 검증한 결과, 기둥이 제거될 경우 처짐이 작게 발생하는 6m 경간 모델보다 처짐이 크게 발생하는 9m경간 모델의 경우에 감쇠기의 효과가 더욱 크게 나타났다. In this paper the progressive collapse resisting capacity of steel moment frames with viscous dampers was evaluated by nonlinear dynamic analysis. The effects of dampers installed in steel beam-column sub-assemblages with varying natural period and yield strength were evaluated after sudden removal of a column. According to the parametric study the vertical displacement general decreased as the damping ratio of the system increased, and the dampers were effective both in elastic and elasto-plastic systems. The nonlinear dynamic analysis results of the 15-story analysis models showed that the decrease in vertical deflection of the structure with 9m span length, which showed larger deflection, was more predominant than that of the structure with 6m span length.
중저층 공동주택의 가변성 향상에 따른 내진성능과 사업성 분석
유지성(Yu Ji-Sung),최현훈(Choi Hyun-Hoon),김진구(Kim Jin-Koo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
Recent trend in apartment buildings is to reduce interior load-bearing walls to improve spatial flexibility and ease of remodeling. This study investigates the seismic performance and cost of apartment buildings as a function of spatial flexibility. According to nonlinear analysis results, shear wall type apartment buildings show superb seismic performance. Combined wall and column-slab type buildings with improved spacial flexibility can also be designed to satisfy current seismic design code. In low-rise apartment buildings wall-type structures, combined structures, and flat slab structures require similar amount of structural materials to satisfy the design loads. However as the number of story increases the structural materials, especially reinforcing steel, rapidly increase in flat-slab buildings.
김진구(Kim Jin-Koo),최현훈(Choi Hyun-Hoon),전용(Jeon Yong) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.5
These days spatial flexibility in apartment buildings becomes more important for architectural planning, and new structural systems are required to meet growing demands for spatial flexibility. In steel structures the staggered truss systems have been applied for residential buildings in United States. However the application of the system in reinforced concrete system has not been widely studied yet. In this study the seismic performance of staggered wall type apartment building was evaluated using non-linear static and dynamic analysis, and was compared with responses of a typical shear wall system apartment building. According to the analysis results, the structure with staggered wall system showed similar strength to the strength of the shear wall-type structure, but showed smaller ductility. However the structure with staggered wall system satisfied the collapse prevention performance objective required by the FEMA-356 and thus is considered to have enough capacity for design level seismic load.