• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2003.05a
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• pp.132-138
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• 2003

In order to evaluate properly ship motion relating to the berthing maneuver, the hydrodynamic forces acting on ship hull in berthing maneuver need to be estimated rightly. CFD has been employed for time-domain simulation of transient flow induced by Wigley model moving laterally from rest in shallow water. The numerical solutions successfully captured not only the characteristics of the transitional hydrodynamic forces but also some interesting features of the flow field around a berthing ship according to the water depth. In this paper, the consideration is carried out on the approximate formula based on the CFD results, which can estimate hydrodynamic forces especially lateral drag coefficient starting from the rest to the uniform movement.

• Journal of the Architectural Institute of Korea Structure & Construction
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• v.36 no.5
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• pp.137-146
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• 2020

In this study, an experimental research was performed to find the characteristics of the lateral load resistance of perforated steel plates which could be developed to retrofit existing RC framed buildings. The Specimens are tested with variables such as aspect ratio of plate, the ratio of perforation area, and the ratio of perforated diameter to strip which is more than 0.6. The lateral load was applied with displacement control until to reach 3.5% drift ratio. Through the experimental results, it was shown that the maximum strength of all specimens were reached at around 0.5% drift ratio and maintained until 3.5% drift ratio. From results, the modified strength prediction formula was derived with the variable ratio of the perforated diameter to strip. To evaluate seismic retrofit performance of RC frames using perforated steel plate, a simple design process was presented.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.25 no.6
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• pp.513-523
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• 2012

The objective of this research is to examine how the lateral resisting system of selected prototypes are affected by seismic zone effect and shape irregularity on its seismic performance. The lateral resisting systems are divided into the three types, diagrid, braced tube, and outrigger system. The prototype models were assumed to be located in LA, a high-seismicity region, and in Boston, a low-seismicity region. The shape irregularity was classified with rotated angle of plane, $0^{\circ}$, $1^{\circ}$, $2^{\circ}$. This study performed two parts of analyses, Linear Response and Non-Linear Response History(NLRH) analysis. The Linear Response analysis was used to check the displacement at the top and natural period of models. NLRH analysis was conducted to invest base shear and story drift ratio of buildings. As results, the displacement of roof and natural period of three structural systems increase as the building stiffness reduces due to the changes in rotation angle of the plane. Also, the base shear is diminished by the same reason. The result of NLRH, the story drift ratio, that was subject to Maximum Considered Earthquake(MCE) satisfied 0.045, a recommended limit according to Tall Building Initiative(TBI).

• Journal of the Computational Structural Engineering Institute of Korea
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• v.28 no.1
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• pp.19-27
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• 2015

Recently, the most of domestic high-rise residential complex buildings are constructed with reinforced concrete structures, which may bring structural problems during construction. This study is aimed to analyze structural safety and lateral load-resisting performance of RC high-rise residential complex building under construction. The tower-typed building with 60 floors is selected as a sample model, and numerical analyses are performed. The structural performances of building structures at construction stages, which are resulted form the analyses of numerical models completed up to 10th, 20th, 30th, 40th, 50th, or 60th floor, are compared to those of the completed building structure. For the comparisons of structural performances, modal shapes and fundamental periods of building structures, lateral load-resisting performances, and structural design performances of structural members are considered. The lateral displacement and story drift ratio are analyzed for lateral load-resisting performances, and comparisons of design ratios at construction and design stages are performed for structural design performances of structural members. The guideline of design loads and structural analysis schemes for checking the safety of RC high-rise building under construction is presented.

• Land and Housing Review
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• v.3 no.4
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• pp.433-449
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• 2012

An experimental investigation was conducted to study the behavior of RC wide beam-column joints with slab subjected to reversed cyclic loads under constant axial load. Six half scale interior wide beam-column assemblies representing a portion of a frame subjected to simulated seismic loading were tested, including three specimens without slab and three specimens with slab. The primary variables were the ratio of column-to-beam flexural capacity ($M_r={\Sigma}M_c/{\Sigma}M_b$ ; 0.77~2.26), ratio of the column-to-beam width (b/H ; 1.54, 1.67). Test results are shown that (1) the current design code and practice for interior joints(type 2) are apply to the wide beam-high strength concrete column. (2) the presence of a slab have an effect on the performance of the wide beam-high strength concrete column interior joints(type 2). therefore in the design of the wide beam-high strength concrete column interior joints(type 2), the width of slab effective as a T beam flange should be considered. It was show that the case of the ratio of column-to-beam flexural capacity is more than 2.0, the effective width of slab are 2 times of an effective depth of wide beam, however if the ratio of column-to-beam flexural capacity is 1.4~2.0, the effective width of slab are not able to be considered.

• 건축구조
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• v.12 no.4
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• pp.52-53
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• 2005

a. 구조체가 받는 힘 중 횡력을 모두 메가컬럼이 부담하고, 내부외 보와 기둥은 중력방향의 하중만을 부담한다. b. 메가컬럼 안으로 코어 기능을 모두 넣어 자유로운 평면구성이 가능하다는 것이 최대의 장점이다. c. 모듈의 반복적인 조합을 통해 나온 유닛의 재조합으로 메가컬럼을 형성하고, 거대한 이 기둥을 외부로 노출시켜 구조미를 추구한다. d. 2009년 9호선 연장을 앞두고 서울의 최고 중심지가 될 강남역을 사이트로 정해 초고층 건물을 건축하여 도시경관을 더 돋보이게 한다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.10a
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• pp.667-668
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• 2012

• Computational Structural Engineering
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• v.2 no.3
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• pp.43-45
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• 1989

건축구조물의 삼차원 거동을 해석하기 위한 S3D는 한국과학기술원 이동근 교수에 의하여 개발되었으며 소프트웨어센터를 통하여 보급되고 있다. 보와 기둥 및 전단벽 등으로 구성된 건축구조물의 삼차원 거동을 효율적으로 해석하기 위하여 S3D에는 여러가지의 특수한 기법이 사용되고 있으며 개인용 전자계산기를 사용하여 사무소건물, 아파트 호텔, 병원 및 학교건물 등과 같이 규칙적인 형태를 대형 건축 구조물에 대한 삼차원 거동을 짧은 시간내에 해석 할 수 있도록 개발되었다. 우리나라의 내진설계 기준에 의한 지진하중 산정 및 층간변위, 우발비틀림 모멘트 등이 손쉽게 계산될 수 있으며 풍하중 등의 횡력에 대한 해석도 가능하다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.400-403
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• 2010

Mega-frame 시스템은 구조적으로 횡력에 가장 효율적으로 저항할 수 있는 구조시스템으로서 200층 이상의 극초고층 건물에 적용되고 있다. 소수의 대형 기둥에 의하여 지지되므로, 기둥의 파괴로 인한 연쇄붕괴의 가능성이 매우 높다. 본 논문에서는 비선형 정적해석을 통하여 다양한 Mega-frame 구조물의 연쇄붕괴 저항능력을 평가해 보았다. 그 결과, Mega-frame 구조물의 연쇄붕괴 거동을 이해하고 이에 합당한 연쇄붕괴 보강방안을 찾으려 한다.

• Journal of Navigation and Port Research
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• v.38 no.1
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• pp.19-27
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• 2014

When a ship operates in a shallow water and channel, the hull sinkage and asymmetrical force generated around the ship by the influence of sea bottom and bank walls are caused collision with sea bottom, other ships or the bank itself. Especially, the shipping company and pilots navigating the area of Europe and North America with many channels are deal with it as a important matter to prevent collision. In this paper, hydrodynamic force generated between the ship and bank using the numerical analysis for the safe navigation of ship, that is, sway force and yaw moment should be presumed qualitatively. It makes a program for fluid analysis of the shallow water and bank effect. Analyses are carried out for three kind of parameter, that is, ship's speed, water depth and ship-bank distance for crude oil carriers. The numerical analysis results are compared with results of the experiments and the previous published papers.