• 콘크리트학회논문집
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• 제12권2호
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• pp.53-62
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• 2000

Under severe lateral loads, ductile moments-resisting reinforced concrete frames will be subjected to large loads and displacements. Thus, large deformation and shear stree are occurred at the beam-column joints which are the most critical region in ductile moments-resisting system. The purpose of this study was to investigate the shear strength of beam-column connection using high strength concrete. Four subassemblies were designed 2/3 scale of read structures and tested. The obtained results are as follows. 1) The transverse beams increase the shear resistance and ductility of joint, 2) The slab was contributed to increase of the flexural capacity of the beam, but was not contributed to increase the joint ductility under cyclic loads. 3) The shear stress factors. given by the ACI code would be modified in evaluating the shear strength of beam-column joints of frame which were constructed with high-strength concrete.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1999년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall
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• pp.396-403
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• 1999

This experimental study investigates the hysterestic behavior of traditional timber frames subjected to lateral loads. Prototype frames for this study were selected from one of typical national treasures for timber structures in Korea. For simplicity roof structures and braket systems were excluded from specimens and the joint behavior of beam-to-column system were presumed to have crucial effect on their global behavior. The experimental observation showed stiffness degradation and slip after experiencing initial yield and the first cycle at a new larger displacement due to inherent gaps in traditional timber connection and gradual indentation of interfaces, The cyclic behaviors of all specimens were similar to those os modern timber frames with bolt and nail connections. Additional structural members such as an upper beam and clay-filled wall increased the initial stiffness strength and energy dissipation. It is expected that collapse of Korean traditional timber frames under lateral load is mainly caused from P-$\Delta$ effects rather than local member failure.

• Steel and Composite Structures
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• 제26권3호
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• pp.361-373
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• 2018

This paper presents the development of finite element (FE) models to simulate the behavior of diagonally stiffened steel plate shear wall systems (SPSWs) with differently shaped openings subjected to a cyclic load. This walling system has the potential to be used for shear elements that resist lateral loads in steel-framed buildings. A number of $\text\tiny{^1/_2}$-scale one-story buildings that were un-stiffened, stiffened and stiffened with opening SPSWs are modeled and simulated using the finite element method based on experimental data from previous research. After validating the finite element (FE) models, the effects of infill plate thickness on the cyclic behavior of steel shear walls are investigated. Furthermore, triple diagonal stiffeners are added to the steel infill plates of the SPSWs, and the effects are studied. Moreover, the effects of a number of differently shaped openings applied to the infill plate are studied. The results indicate that the bearing capacity and shear resistance are affected positively by increasing the infill plate thickness and by adding triple diagonal stiffeners. In addition, the cyclic behavior of SPSWs is improved, even with an opening in the SPSWs.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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• pp.419-422
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• 1999

This study was intended to investigate the cyclic behavior of high strength concrete beam-column connection. Four assemblies were designed 2/3 scale beam-column-slab joint and tested. The obtained results are follows. 1) The transverse beams increase the shear resistance and ductility of joint, 2) The slab was contributed to increase of the flexural capacity of the beam, but was not contributed to increase the joint ductility under lateral loads.

• 한국전산구조공학회논문집
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• 제25권6호
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• pp.525-532
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• 2012

근래에 지어진 건축물의 경우 지진에 대한 안전성을 확보하고 있지만 1983년 개정이전의 건축물은 내진설계가 미반영 되어 있어 지진에 대해 매우 취약하다. 본 연구에서는 내진성능이 부족한 기존 건축물의 지진 발생 시의 안전성 확보를 위한 내진보강 방안으로 격자강판 내진보강벽을 제안한다. 축력과 반복수평력을 받는 성능실험을 수행하였으며, 실험체는 벤치마크 용도로 순수 철근콘크리트 프레임(BM-RC)과 프레임 내부에 격자강판 내진보강벽(SW-RC)을 설치한 2개의 실험체를 제작하여 실험을 수행하였고, 축력과 횡하중 가력을 위하여 500kN용량의 엑츄에이터 2대와 2,000kN용량의 엑츄에이터 1대를 사용하였다. 실험결과를 통해 벤치마크 실험체와 비교하여 강도, 강성, 연성 및 에너지소산능력을 평가하였다.

• 한국지진공학회논문집
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• 제13권1호
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• pp.45-52
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• 2009

본 연구의 목적은 일정 축하중과 반복횡하중 하에서 탄소섬유시트와 비좌굴 가새로 보강된 보-기둥 시험체의 횡방향 거동 평가를 통하여 사용된 보강 방법의 구조적 성능을 검증하는 것이다. 세 개의 시험체를 비보강, 탄소섬유보강, 탄소섬유와 비좌굴 가새 보강 방법을 각각 적용하여 제작하였다. 변위에 따른 최대, 최소하중은 하중-변위 관계를 분석함으로써 평가되어지며, 하중과 강성의 관계는 비교구간의 유효강성 분석에 의해 평가된다. 실험의 수행 결과, 보강을 하지 않은 시험체에 비하여 보강을 적용한 시험체는 최대허용하중과 유효강성, 철근 항복 시 재하 횡하중, 변위연성비 등에서 상대적으로 우수한 성능을 보였다.

• Steel and Composite Structures
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• 제22권2호
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• pp.235-255
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• 2016

This paper experimentally investigated the behavior of steel frame structures of traditional-style buildings subjected to combined constant axial load and reversed lateral cyclic loading conditions. The low cyclic reversed loading test was carried out on a 1/2 model of a traditional-style steel frame. The failure process and failure mode of the structure were observed. The mechanical behaviors of the steel frame, including hysteretic behaviors, order of plastic hinges, load-displacement curve, characteristic loads and corresponding displacements, ductility, energy dissipation capacity, and stiffness degradation were analyzed. Test results showed that the Dou-Gong component (a special construct in traditional-style buildings) in steel frame structures acted as the first seismic line under the action of horizontal loads, the plastic hinges at the beam end developed sufficiently and satisfied the Chinese Seismic Design Principle of "strong columns-weak beams, strong joints-weak members". The pinching phenomenon of hysteretic loops occurred and it changed into Z-shape, indicating shear-slip property. The stiffness degradation of the structure was significant at the early stage of the loading. When failure, the ultimate elastic-plastic interlayer displacement angle was 1/20, which indicated high collapse resistance capacity of the steel frame. Furthermore, the finite element analysis was conducted to simulate the behavior of traditional-style frame structure. Test results agreed well with the results of the finite element analysis.

• Earthquakes and Structures
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• 제18권5호
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• pp.637-648
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• 2020

In this study, a new steel cylindrical shell configuration of the dissipative energy device is proposed to improve lateral ductility and to reduce the damage of the structures against seismic forces. Four nested-eccentric- cylindrical shells are used to constructing this device; therefore, this proposed device is named nested-eccentric-cylindrical shells damper (NECSD). The particular configuration of the nested-eccentric-cylindrical shells is applied to promote the mechanical characteristics, stability, and overall performance of the damper in cyclic loads. Shell-type components are performed as a combination of series and parallel non-linear springs into the in-plan plastic deformation. Numerical analysis with respect to dimensional variables are used to calculate the mechanical characteristics of the NECSD, and full-scale testing is conducted for verifying the numerical results. The parametric study shows the NECSD with thin shells were more flexible, while devices with thick shells were more capacious. The results from numerical and experimental studies indicate that the NECSD has a stable behavior in hysteretic loops with highly ductile performance, and can provide appropriate dissipated energy under cyclic loads.

• 한국강구조학회 논문집
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• 제15권2호
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• pp.207-217
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• 2003

콘크리트충전 강관구조는 합성효과에 의해 강관과 콘크리트의 단점을 상호보완하여 역학적으로 우수한 성능을 발휘할 수 있다. 그래서, 최근에는 고층건물에 구조시스템의 대안으로서 주목을 받고 있다. 본 연구의 목적은 일정축력과 반복 수평력을 받는 콘크리트충전 강관기둥의 내력 및 변형성능을 평가하는 것이다. 이 실험의 변수로는 강관의 폭두께비, 축력비 및 강관의 형상으로 정하여 총 18개의 실험체를 제작하여 실험하였다. 실험결과로부터 실험체의 최대내력 및 변형성능에 대해 검토하였다.

• 한국강구조학회 논문집
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• 제12권2호통권45호
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• pp.209-219
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• 2000

콘크리트충전 강관구조는 합성효과에 의해 강관과 콘크리트의 단점을 상호보완하여 역학적으로 우수한 성능을 발휘할 수 있다. 그래서, 최근에는 초고층구조물시스템의 하나로 주목을 받고 있다. 본 연구의 목적은 일정축력과 반복 수평력을 받는 콘크리트 충전 각형강관기둥의 내력 및 변형성능을 평가하는 것이다. 이 실험의 변수로는 강관의 폭 두께비, 축력비, 콘크리트 강도, 하중가력방법과 콘크리트의 충전유무로 정하여 총 16개의 실험체를 제작하여 실험하였다. 실험결과로부터 실험체의 최대내력, 초기강성 및 변형성능에 대해 검토하였다.