• Nuclear Engineering and Technology
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• 제54권9호
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• pp.3353-3360
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• 2022

Using data from the design earthquake of the Korean standard nuclear power plant, seismic analyses of a fuel assembly are conducted in this study. The modal characteristics are used to develop an input deck for the seismic analysis. With a time history analysis, the responses of the fuel assembly in the event of an earthquake are obtained. In particular, the displacement, velocity, and acceleration responses at the center location of the fuel assembly are obtained in the time domain, with these outcomes then used for a detailed structural analysis of the fuel rods in the ensuing analyses. The response spectra are also generated to determine the response characteristics in the frequency domain. The structural integrity of the fuel assembly can be ensured through this type of time history analysis considering the input excitations of various earthquakes considered in the design.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.702-707
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• 2000

Under the rapid change of a new vehicle model, it is necessary to develop a durability analysis technique using computer simulation. In order to do this. reliable dynamic stress-time history for the vehicle components must be calculated on various road conditions. In this paper, a full vehicle simulation model which is composed of flexible frame and chassis components is proposed and verified its reliability from the comparison with field test data. Finally, dynamic stress-time history on the rear chassis components is predicted with hybrid and modal superposition method.

• Earthquakes and Structures
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• 제8권1호
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• pp.133-152
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• 2015

This paper investigates the soil effect on seismic behaviour of reinforced concrete (RC) buildings by using the spread plastic hinge model which includes material and geometric nonlinearity of the structural members. Therefore, typical reinforced concrete frame buildings are selected and nonlinear dynamic time history analyses and pushover analyses are performed. Three earthquake acceleration records are selected for nonlinear dynamic time history analyses. These records are adjusted to be compatible with the design spectrum defined in Turkish Seismic Code. Interstory drifts and damages of selected buildings are compared according to local soil classes. Also, capacity curves of these buildings are compared with maximum responses obtained from nonlinear dynamic time history analyses. The results show that, soil class influences the seismic behaviour of reinforced concrete buildings, significantly.

• 한국지진공학회논문집
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• 제25권1호
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• pp.43-52
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• 2021

According to several seismic design standards, a ground motion time history should be selected similar to the design response spectrum, or a ground motion time history should be modified by matching procedure to the design response spectrum through the time-domain method. For the response spectrum matching procedure, appropriate seed ground motions need to be selected to maintain recorded earthquake accelerogram characteristics. However, there are no specific criteria for selecting the seed ground motions for applying this methodology. In this study, the characteristics of ground motion time histories between seed motions and spectral matched motions were compared. Intensity measures used in the design were compared, and their change by spectral matching procedure was quantified. In addition, the seed ground motion sets were determined according to the response spectrum shape, and these sets analyzed the response of nonlinear and equivalent linear single degrees of freedom systems to present the seed motion selection conditions for spectral matching. As a result, several considerations for applying the time domain spectral matching method were presented.

• 한국지반공학회논문집
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• 제31권9호
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• pp.53-68
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• 2015

매설가스배관의 내진설계에서 종방향 변형률은 중요한 평가 요소이다. 일반적으로 지진파를 조화파로 단순화하며 이의 파장은 토층의 주기와 전단파 속도의 곱으로 계산하여 매설관의 응답을 계산하는 경험적 설계방법이 널리 사용되지만 이의 정확성이 평가된 사례가 없다. 본 연구에서는 1차원 지반응답해석을 수행하여 매설심도에서의 변위-시간 이력을 추출하였으며, 이를 적용한 시간이력해석을 수행하여 매설관의 응답을 평가하였다. 매설관과 지반의 상호작용은 3차원 쉘-스프링 모델을 사용하여 모사하였다. 시간이력해석으로 계산된 결과는 설계방법과 비교하여 이의 정확성을 평가하였다. 비교 결과, 파장을 예측하기 위해서는 지반응답해석을 수행해야 하는 것으로 나타났다. 토층의 고유주기는 가속도의 탁월주기를 예측하는 데에는 활용될 수 있으나 변위의 탁월주기를 예측할 수 없는 것으로 나타났다. 반면, 파장에 대한 정확한 정보가 제공될 경우, 조화파에 대하여 제시된 해석해는 정확도가 높으며 설계에 적용 가능한 것으로 나타났다. 본 연구 대상이 동시베리아 지역에 적용될 매설가스관이라 동시베리아 지역의 대표 주상도를 해석 에 사용하였지만 본 연구의 결론은 기타 모든 지역에 적용 가능하며 가스관뿐만 아니라 상수도관 등 다양한 매설관에 적용 가능하다.

• 국제초고층학회논문집
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• 제1권3호
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• pp.155-167
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• 2012

This paper introduces the outlines of review and approval processes, general criteria and usual practices taken in Japan for the seismic design of high-rise buildings. The structural calculations are based on time-history analyses followed by performance evaluations. This paper also introduces structural design of two high-rise buildings: one is a 100 m high reinforced concrete residential building, and the other is a 300 m high steel building for mixed use.

• 한국안광학회지
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• 제9권2호
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• pp.371-380
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• 2004

안경의 역사는 인쇄술의 발전과 함께 시작되었다고 할 수 있다. 맨 처음 안경은 가죽으로 만들어 졌다. 그 이후 나무나 뿔, 혹은 뼈로서 안경테를 만들고, 수정이나 유리로 렌즈를 만들어 끼운 단 안경 두 개의 대못으로 연결시킨 대못안경(Riveted Spectacles)이 개발된 이래 안경테는 수많은 스타일로 변화되어 왔다. 그 후 코다리(Bridge)의 개발, 다리 (Temple)의 등장으로 오늘날의 안경의 형태가 나오기 시작했고, 오늘날 다양한 디자인과 소재들이 개발되면서 실용적이며 안경의 스타일에 이르게 되었다. 그럼으로, 안경제조업체와 안경디자이너들은 새로운 안경패션 트랜드를 리드할 수 있는 디자인 개발에 주력하고 있다. 본 연구에서는 현재의 안경테가 있기 까지 역사적 발달과정을 통한 다양한 스타일의 안경테를 분석하고, 디자인의 목적인 형태와 기능의 관점에서 안경디자인의 방법적 요소를 조사해보고자 한다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 봄 학술발표회 논문집
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• pp.159-168
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• 1999

In seismic analysis, there are two main ways - uniform load method and dynamic analysis, dynamic analysis can be divided into response spectrum analysis and time history analysis. In case of which get the complexion of the vibration with 3-axis of coordinate direction in each mode of free vibration mode happened owing to complication of the shape, 3-dimensional dynamic analysis is recommended to perform as multi-mode spectral analysis in standard specification for highway bridge. The purpose of this study is to understand the dynamic behavior by performing multi-mode seismic analysis according to responses analysis and time history anal)'sis in using record of earthquake. In accordance with the criterion of seismic design as defined in standard specification for highway bridge by using modified records of the El Centre and Coyote Lake earthquake, response spectrum was constructed by using the tripartite logarithmic plot. The 3-span continuous space truss bridge was selected as model of numerical analysis. As the result performed time history analysis and analysis of response spectrum for the model of numerical analysis, the result of time history analysis was slightly larger than that of response spectrum analysis. This coincide with the tendency of the result came from the analysis when using a jagged response spectrum analysis, This coincide with the tendency of the result came from the analysis when using a jagged response spectrum for a single excitation. In the Process of performing these two analysis. response spectrum analysis is more effective than time history analysis in saving times in analyzing data.

• 한국지진공학회논문집
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• 제23권2호
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• pp.109-117
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• 2019

In this study, a design procedure for the practical application of the dampers to building structures under earthquake loads was presented by using earthquake response spectrum. Nonlinear time history results using a 10 story building structure installed with damper verified the effectiveness of the proposed procedure by showing that the structural response could be reduced to the target performance level for seismic loads. Since the proposed design procedures are based on response spectrum seismic analysis result of the original structure, the capacity, location and the number of damper and the consequent response reduction effects can be preliminarily determined without performing the nonlinear time history analysis.

• Structural Engineering and Mechanics
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• 제85권1호
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• pp.55-64
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• 2023

Energy-based seismic design and evaluation methods are promising to be involved in the next generation design codes. Accordingly, determining the distribution of earthquake input energy demand among floor levels is quite imperative in order to develop an energy-based seismic design procedure. In this paper, peak floor input energy demands are achieved from relative input energy response histories of several reinforced concrete (RC) frames. A set of 22 horizontal acceleration histories selected from recorded near-fault earthquakes and scaled in time domain to be compatible with the elastic acceleration design spectra of Turkish Seismic Design Code are used in time history analyses. The distribution of the computed input energy per mass values and the arithmetic means through the height of the considered RC frames are presented as a result. It is found that spatial distribution of input energy per mass is highly affected by the number of stories. Very practical yet consistent formulation of distributing the total input energy to story levels is achieved, as a most important contribution of the study.