• Structural Engineering and Mechanics
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• 제3권6호
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• pp.569-581
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• 1995

In this paper, the seismic behavior of a 10-story building equipped with viscoelastic dampers is analyzed. The effects of ambient temperature, the thickness, the total area, and the position of the viscoelastic dampers are studied. Results indicate that the energy-absorbing capacity of viscoelastic damper decreases with increasing the ambient temperature. The thickness and the total area of viscoelastic dampers also affect the seismic mitigation capacity. The thickness cannot be too small, which is not effective in vibration reduction, nor can it be too large, which not only increases the cost but also reduces the seismic resistance. The total area of viscoelastic dampers should be determined properly for optimum damper performance at the most economical design. The mounting position of viscoelastic dampers also influences the structure's seismic performance. Numerical results show that, if properly equipped, the VE dampers can reduce the structural response both floor displacement and story shear force and increase the overall level of damping in structures during earthquakes.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1998년도 가을 학술발표회 논문집
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• pp.35-42
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• 1998

Response spectrum analysis method(RSA) rather than time history analysis method(THA) continues to e used by the profession for evaluating maximum dynamic responses of structures subjected to earthquake excitations. Nevertheless, this simple and practical method can cause significant errors in some cases with unproper modal combination method and so on. To obtain more exact responses based n RSA many studies have been carried out considering displacement of top story, base shear and overturning moment. The purpose of this study is to verify error characteristics in RSA with respect to various responses including displacement shear force and overturning moment of each story. It's shown that RSA appears to yield underestimated responses when compared to THA calculations. Also, errors involved in RSA computations grow with an increase in total number of stories.

• Earthquakes and Structures
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• 제5권3호
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• pp.277-296
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• 2013

Margin of safety against potential of progressive collapse is among important features of a structural system. Often eccentricity in plan of a building causes concentration of damage, thus adversely affects its progressive collapse safety margin. In this paper the progressive collapse of symmetric and asymmetric 3-story reinforced concrete ordinary moment resisting frame buildings subjected to the earthquake ground motions are studied. The asymmetric buildings have 5%, 15% and 25% mass eccentricity. The distribution of the damage and spread of the collapse is investigated using nonlinear time history analyses. Results show that potential of the progressive collapse at both stiff and flexible edges of the buildings increases with increase in the level of asymmetry in buildings. It is also demonstrated that "drift" as a more easily available global response parameter is a good measure of the potential of progressive collapse rather than much difficult-to-calculate local response parameter of "number of collapse plastic hinges".

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.53-56
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• 2008

A reinforced concrete (RC) cast-in-place (CIP) infill wall retrofitting method may provide an improved seismic performance and economical efficiency for the non-ductile rahmen structures. In this study, four one story-one bay non-ductile frame were constructed and retrofitted with CIP infill wall to evaluate seismic performance of CIP infill wall-frame. From the test results, infill wall-frame exhibited a marked increase in shear strength compared to non-ductile RC frame specimen. But the ductility and story-drift at maximum load were decreased when shear strength of infill wall larger than that of existing RC frame. Therefore, it is confirmed that adequate reinforcement detail is required to assure sufficient seismic performance.

• Steel and Composite Structures
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• 제25권2호
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• pp.217-229
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• 2017

The effect of column loss location on the structural response of steel moment resisting frames (MRF) is investigated in this study. A series of nonlinear static and dynamic analyses were performed to determine the resistance of a generic frame to an arbitrary column loss and detect the structural members that are susceptible to failure progression beyond that point. Both force-controlled and deformation-controlled actions based on UFC 4-023-03 and ASCE/SEI 41-06 were implemented to define the acceptance criteria for nine APM cases defined in this study. Results revealed that the structural resistance against an arbitrary column loss in the top story is at least 80% smaller than that of the bottom story. In addition, it was found that the dynamic increase factor (DIF) at the failure point is at most 1.13.

• 대한건축학회논문집:구조계
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• 제35권8호
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• pp.149-156
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• 2019

In this study, dynamic responses of high - rise buildings were analyzed through the change of horizontal stiffness and yield strength among characteristics of seismic isolation system by applying middle - layer seismic isolation system to high - rise buildings of 120m height. As a result in order to prevent the displacement of the isolation layer and to control the maximum torsion angle, it is possible to appropriately control by increasing or decreasing the horizontal stiffness and the yield strength. However, depending on the maximum torsional angle and the hysteretic behavior of the seismic isolation system, excessive yield strength and horizontal stiffness increase may induce the elastic behavior of the structure and amplify the response. Therefore, it is considered that it is necessary to select the property value of the appropriate isolation device.

• Steel and Composite Structures
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• 제21권4호
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• pp.863-882
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• 2016

This study aims to introduce a new bracing system by which even super-wide frames with large openings can be braced. The proposed system, hereafter called Cable-Pulley Brace (CPB), is a tension-only bracing system with a rectilinear configuration. In CPB, a wire rope passes through a rectilinear path around the opening(s) and connects the lower corner of the frame to its opposite upper one. CPB is a secondary load resisting system with a nonlinear-elastic hysteretic behavior due to its initial pre-tension load. As a result, the required energy dissipation would be provided by the MRF itself, and the main intention of using CPB is to contribute to the initial and post-yield stiffness of the whole system. Using a stiffness calibration technique, optimum placement of the CPBs is discussed to yield a uniform displacement demand along the height of the structure. A displacement-based design procedure is proposed by which the MRF with CPB can be designed to achieve a uniform distribution of inter-story drifts with predefined values. Obtained results indicated that CPB leads to significant reductions in maximum and residual deformations of the MRF at the expense of minor increase in the maximum base shear and developed axial force demands in the columns. In the case of a typical 5-story residential building, compared to SMRF system, CPB system reduces maximum amounts of inter-story and residual drifts by 35% and 70%, respectively. Moreover, openings of the frame are not interrupted by the CPB. This is the most appealing feature of the proposed bracing system from architectural point of view.

• 디지털융복합연구
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• 제12권2호
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• pp.495-501
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• 2014

본 연구는 앞서 가족이야기(familyStory)를 중심으로 인터렉티브 스토리텔링을 지원하는 데이터의 서술구조연구를 바탕으로 가족콘텐츠 스토리족보 저작시스템 설계 및 구현에 대한 연구이다. 한 인간이 태어나서 가지게 되는 이름, 생년월일, 가계도와 같이 정체성 있는 1차적 정보와 본인과 가족구성원이 경험하는 업적, 에피소드, 경험 등의 2차적 정보를 '가족콘텐츠'라고 정의한다. 본 저작 시스템에서 제시하는 '스토리가 있는 가계도(족보)'를 한 줄로 정의하면 가계도에 스토리텔링을 적용하여 가족스토리를 만드는 것으로, 현존하는 1세대가 생존기간 동안 한 가족의 광범위한 역사를 이후 세대들에게 남기는 것으로서 매우 가치 있고 중요한 일이다. 가족콘텐츠 스토리족보 저작도구는 1,2세대의 경험적 지식의 이야기를 텍스트, 이미지, 영상 등 디지털 매체를 사용하여 쉽게 저작할 수 있으며, 저작된 다양한 장르의 가족이야기를 가지고 3세대와의 소통을 위한 도구로 활용하거나, 이야기를 재구성하여 창작이야기를 작성하는데 활용 가능하다.

• 한국지진공학회논문집
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• 제5권3호
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• pp.45-55
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• 2001

본 연구는 점탄성 감쇠기의 최적설계에 관한 연구로서 기존에 독립적으로 설계되던 점탄성 감쇠기와 설치용 가새 강성의 동시 최적설계 방법을 제시하였다. 이를 위해 직렬 연결된 점탄성 감쇠기와 가새를 상태방정식으로 모델링하였으며 최대응답계수를 이용해서 각층 최대 층간변위를 구속조건으로 하여 최적화 문제를 구성하였다. 구속조건에 대한 기울기 정보를 계산하는 과정에서 구조물의 동적거동에 관한 구속조건을 포함시켜서 문제를 재구성함으로써 변수를 줄일 수 있었다. 설계예제를 통해 현실적으로 충분한 가새 강성이 제공될 수 없는 경우에는 층간변위 구속조건을 만족시키기 위해서 가새 강성을 고려한 감쇠기 설계가 필요함을 확인할 수 있었다. 또한 가새 강성을 최적화 변수에 포함시킴으로써 불필요한 가새 강성을 줄일 수 있었으며 이를 보상하기 위한 감쇠기 물량의 상대적인 증가는 크지 않다는 것을 확인할 수 있었다.

• 디지털융복합연구
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• 제11권1호
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• pp.423-430
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• 2013

정보통신기술의 발달은 다양한 디지털매체와 소셜네트워크(SNS) 출연을 가져왔으며, 정보와 지식을 전달하는 방법에 있어서 '객관적지식'에서 '경험적지식'을 실시간 이야기하고 감성을 소통가능하게 하였다. 본 연구에서는 가족의 역사, 개인의 인물사등 선형적인 서사 장르의 이야기를 가지고 다양한 형태로 이야기를 생성할 수 있는 인터렉티브 스토리텔링 시스템을 연구하고자 한다. CEO이야기나 특정 조직이야기, 가족이야기등 다양한 콘텐츠 가운데 가족이야기(familyHistory)를 본 연구의 사례연구 관점에서 내러티브인터뷰, 직접관찰, 문서 및 영상자료수집 등을 통해 수집 분석 한 후 장르별 DB와 키워드DB 설계를 하여 분류 저장하였다. 저장된 자료는 인터렉티브 스토리텔링 서술구조를 통하여 사용자가 가족의 역사와 이야기에 대한 스토리텔링을 재구성하여 사용함으로써 이야기의 가치와 활용도를 높이고자 하였다. 본 연구를 통하여 각 세대간의 소통의 도구가 부족한 한국의 현황에서 1세대와 3세대 간의 텍스트, 이미지, 영상등 다양한 형태의 디지털 매체를 사용하는 저작시스템의 데이터모델을 작성하였으며, 더 나아가 DB화된 다양한 장르의 가족이야기를 가지고 인터렉티브 스토리텔링 창작 도구로 연동 가능한 시스템 설계를 연구하였다.