• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1992년도 봄 학술발표회 논문집
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• pp.7-12
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• 1992

The variable node plate bending element, ie, the element with one or two additional mid-side nodes is used in the analysis of mat foundation to generate the nearly ideal grid model in which more nodes are defined near the column location. The plate bending element used in this study is the one based on Mindlin/Reissner plate theory with substitute shear strain field and the nodal stresses of that element are obtained by the local smoothing technique. The interaction of the soil material with the mat foundation is modeled with Winkler springs connected to the nodal points in the mat model. The vertical stiffness of the soil material are represented in terms of a modulus of subgrade reaction and are computed in the same way as to the computation of consistent nodal force of uniform surface loading. Several mesh schemes were proposed and tested to find the most suitable scheme for mat foundation analysis.

• Structural Engineering and Mechanics
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• 제59권6호
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• pp.1071-1094
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• 2016

We employ the so-called problem-dependent linked interpolation concept to develop two cubic 4-node quadrilateral plate finite elements with 12 external degrees of freedom that pass the constant bending patch test for arbitrary node positions of which the second element has five additional internal degrees of freedom to get polynomial completeness of the cubic form. The new elements are compared to the existing linked-interpolation quadratic and nine-node cubic elements presented by the author earlier and to the other elements from literature that use the cubic linked interpolation by testing them on several benchmark examples.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.706-711
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• 2005

From the using CWR (Continuously Welded Rail) on steel plate girder bridges without ballast, axial forces are occurred from a temperature on CWR and girders. Because of the additional axial forces, studies in order to CWR and developments of devices are proceeding. The track system of steel plate girder bridges is poor. When CWR is used for the system, the resistance on sleepers is increased from a temperature. So it is increasing an effect on CWR and, for solving the effect, longitudinal forces for buckle are being decreased. It is possible that opposite cases can be happened and it is also compared and studied. Therefore, we present a reasonable model for analyzing CWR within the property of steel plate girder railway bridges in Korea. Furthermore, the results analyzed for stability is compared and evaluated with tests. Finally, a reasonable method for the installation of CWR on bridges without ballast is suggested.

• Selected Papers of The Society of Naval Architects of Korea
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• 제1권1호
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• pp.91-100
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• 1993

A displacement-based finite element method Is presented for the geometrically nonlinear analysis of eccentrically stiffened plates. A nonlinear degenerated shell element and a nonlinear degenerated eccentric isoparametric beam (isobeam) element are formulated on the basis of Total Agrangian and Updated Lagrangian descriptions. In the formulation of the isobeam element, some additional local decrees of freedom are implementd to describe the stiffener's local plate buckling modes. Therefore this element can be effectively employed to model the eccentric stiffener with fewer D.O.F's than the case of a degenerated shell element. Some detailed buckling and nonlinear analyses of an eccentrically stiffened plate are performed to estimate the critical buckling loads and the post buckling behaviors including the local plate buckling of the stiffeners discretized with the degenerated shell elements and the isobeam elements. The critical buckling loads are found to be higher than the analytical plate buckling load but lower than Euler buckling load of the corresponding column, i.e, buckling strength requirements of the Classification Societies for the stiffened plates.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.503-506
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• 2005

The purpose of this study was the Development of Retrofit Method for Beam Using Steel Plate Reinforced by Fiber Sheet.1. Additional reinforcements are not needed in the joining area of slab and beam web.2. Beam using carbon fiber reinforced plastic displays low effects in shearing effect.3. Beams reinforced steel plate by epoxy effect the capacities of strength. But the capacities of strength are rapidly reduced when adhesive surface be omitted. Thus details are needed in this case.4.Retrofit method for beam using steel plate reinforced by fiber sheet with epoxy rosin improves the capacities of strength and the initial stiffness, shows a large transformation since the maximum load likewise may be excellent to the shearing reinforcement.

• 설비공학논문집
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• 제1권2호
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• pp.182-189
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• 1989

The propose of this study is augmentation of heat transfer without additional external power in 2-dimensional impinging air jet. The passive heat transfer augmentation method tried in this experimental study is placement of rod bundles with the clearance, 2mm, in front of the heat transfer surface. The effects of pitch distance among rods and nozzle-to-target plate distance are investigated. The overall heat transfer rate of flat plate with rods reaches maximum at H/B=10 and P=40mm, and for H/B=2 and P=40mm the augmentation rate of heat transfer becomes maximum to a value which is about 1.57 times that of the flat plate without rods.

• 대한조선학회논문집
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• 제38권1호
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• pp.72-85
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• 2001

선박 판부재를 대상으로 중요한 하중경우의 하나인 양축방향 면내하중을 작용시키면서 이중판의 폭, 길이, 두께 및 주판(main plate) 부식 영향 등의 각종 파라메타 영향에 따른 이중판의 정적 강도평가를 주판의 접촉효과를 고려한 탄소성 대변형 비선형 시리즈 구조해석을 수행하였으며 이들 해석 결과로부터 각 파라메타의 변화에 따른 강성과 강도 특성을 분석하였다. 또한 이중판의 보강 효과가 최소한 새판으로 치환 보수한 평판 강도 수준으로 설계되어야 하므로 이를 손쉽게 파악할 수 있게 이중판으로 보강된 판부재를 등가 평판 두께로 환산할 수 있는 간이 평가식을 개발하였다. 이 개발식을 이용하여 각 이중판 설계의 영향인자 변화에 따른 등가 평판두께의 증감 정도를 파악하고 이로부터 적어도 새판으로 보수한 평판강도에 달할 수 있게 양축방향 면내 압축하중을 받는 이중판의 설계지침을 제시하였다. 마지막으로, 개발된 등가 평판 도출식은 고정밀 좌굴강도 평가식과 서로 일정한 상관관계가 있음을 확인하고 관계식을 정립하였다. 이 관계식을 각 경우별로 축적하여 앞으로 일일이 구조해석을 수행하지 않고도 설계된 이중판 강도를 등가 평판두께로 제시할 수 있는 간이 추정식의 개발에 이용될 수 있을 것으로 사료된다.

• 대한조선학회논문집
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• 제37권4호
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• pp.92-105
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• 2000

세장한 선박 판부재를 대상으로 가장 중요한 하중인 종방향 면내하중을 작용시키면서 이중판의 폭, 길이, 두께 및 주판(main plate) 부식 영향 등의 각종 파라메타 영향에 따른 이중판의 정적 강도평가를 주판의 접촉효과를 고려한 탄소성 대변형 비선형 시리즈 구조해석을 수행하였으며 이들 해석 결과로부터 각 파라메타의 변화에 따른 강성과 강도 특성을 분석하였다. 또한 이중판의 보강 효과가 최소한 새판으로 치환 보수한 평판 강도 수준으로 설계되어야 하므로 이를 손쉽게 파악할 수 있게 이중판으로 보강된 판부재를 등가 평판 두께로 환산할 수 있는 간이 평가식을 개발하였다. 이 개발식을 이용하여 각 이중판 설계의 영향인자 변화에 따른 등가 평판두께의 증감 정도를 파악하고 이로부터 적어도 새판으로 보수한 평판강도에 달할 수 있게 길이방향 일축 면내 압축하중을 받는 세장한 이중판의 설계지침을 제시하였다. 마지막으로, 개발된 등가 평판 도출식은 고정밀 좌굴강도 평가식과 서로 일정한 상관관계가 있음을 확인하고 관계식을 정립하였다. 이 관계식을 각 경우별로 축적하여 앞으로 일일이 구조해석을 수행하지 않고도 설계된 이중판 강도를 등가 평판두께로 제시할 수 있는 간이 추정식의 개발에 이용될 수 있을 것으로 사료된다.

• Steel and Composite Structures
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• 제15권1호
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• pp.81-101
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• 2013

In this paper a robust 2-noded connection element has been developed for modelling the bolted end-plate connection between steel beam and column at elevated temperatures. The numerical procedure described is based on the model proposed by Huang (2011), incorporating additional developments to more precisely determinate the tension, compression and bending moment capacities of end-plate connection in fire. The proper failure criteria are proposed to calculate the tension capacity for each individual bolt row. In this new model the connection failure due to bending, axial tension, compression and shear are considered. The influence of the axial force of the connected beam on the connection is also taken into account. This new model has the advantages of both the simple and component-based models. In order to validate the model a total of 22 tests are used. It is evident that this new connection model has ability to accurately predict the behaviour of the end-plate connection at elevated temperatures, and can be used to represent the end-plate connections in supporting performance-based fire resistance design of steel-framed composite buildings.

• Computers and Concrete
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• 제24권5호
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• pp.423-436
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• 2019

Design equations to evaluate the bursting force in a post-tensioned anchorage zone have been introduced in many design codes, and one equation in AASHTO LRFD is widely used. However, this equation may not determine the bursting force exactly because it was designed on the basis of two-dimensional numerical analyses without considering various design parameters such as the duct hole and shape of the bearing plate. To improve the design equation, modification of the AASHTO LRFD design equation was considered. The behavior of the anchorage zone was investigated using three-dimensional linear elastic finite element analysis with design parameters such as bearing plate size and diameter of sheath hole. Upon the suggestion of a modified design equation for evaluating the bursting force in an anchorage block with a rectangular anchorage plate (Kim and Kwak 2018), additional influences of design parameters that could affect the evaluation of bursting force were investigated. An improved equation was introduced for determining the bursting force in an anchorage block with a circular anchorage plate, using the same procedure introduced in the design equation for an anchorage block with a rectangular anchorage plate. The validity of the introduced design equation was confirmed by comparison with AASHTO LRFD.