• Structural Engineering and Mechanics
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• 제89권2호
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• pp.155-170
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• 2024

Several types of column-beam connections are used in the design of steel structures. This situation causes different cross-section effects and, therefore, different displacements and deformations. In other words, connection elements such as welds, bolts, continuity plates, end plates, and stiffness plates used in steel column-beam connections directly affect the section effects. This matter reveals the necessity of knowing the steel column-beam connection behaviours. In this article, behaviours of bolted column-beam connection with end plate widely used in steel structures are investigated comparatively the effects of the stiffness plates added to the beam body, the change in the end plate thickness and bolt diameter. The results obtained reveal that the moment and force carrying capacity of the said connection increases with the increase in the end plate thickness and bolt diameter. In contrast, it causes the other elements to deform and lose their capacity. This matter shows that optimum dimensions are very important in steel column-beam connections. In addition, it has been seen that adding a stiffness plate to the beam body part positively contributes to the connection's moment-carrying capacity.

• Structural Engineering and Mechanics
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• 제68권3호
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• pp.299-312
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• 2018

In this paper, an extended finite element method is proposed to analyze both geometric and material non-linear behavior of general Functionally Graded Material (FGM) plate-shell type structures. A user defined subroutine (UMAT) is developed and implemented in Abaqus/Standard to study the elastoplastic behavior of the ceramic particle-reinforced metal-matrix FGM plates-shells. The standard quadrilateral 4-nodes shell element with three rotational and three translational degrees of freedom per node, S4, is extended in the present study, to deal with elasto-plastic analysis of geometrically non-linear FGM plate-shell structures. The elastoplastic material properties are assumed to vary smoothly through the thickness of the plate-shell type structures. The nonlinear approach is based on Mori-Tanaka model to underline micromechanics and locally determine the effective FGM properties and self-consistent method of Suquet for the homogenization of the stress-field. The elasto-plastic behavior of the ceramic/metal FGM is assumed to follow Ludwik hardening law. An incremental formulation of the elasto-plastic constitutive relation is developed to predict the tangent operator. In order to to highlight the effectiveness and the accuracy of the present finite element procedure, numerical examples of geometrically non-linear elastoplastic functionally graded plates and shells are presented. The effects of the geometrical parameters and the volume fraction index on nonlinear responses are performed.

• 한국지진공학회논문집
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• 제16권5호
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• pp.23-32
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• 2012

최근 국내에서는 원자력발전소의 모듈화 공법에 적용하기 위하여 SC(steel plate concrete) 구조를 개발하는 연구를 진행하고 있다. 이 연구에서는 전단보강이 없는 비보강 SC 전단벽의 횡방향 내진성능 및 강성특성에 대하여 분석하기 위하여 전단벽 모형 시편을 제작하고, 이를 대상으로 정적가력실험을 수행하였다. 실험 결과를 이용하여, 이 논문에서는 비보강 SC 구조의 횡력에 대한 파괴모드의 유형을 분석하고, 단면강도와 부재의 강성 특성을 검토하였다. 그리고 SC 구조용 설계기준에서 제시하는 단면의 강도 계산식과 실험결과를 비교하였다. 연구결과, 비보강 SC 전단벽의 파괴 형태의 하나는 콘크리트와 강판의 부착 상실로 인한 휨전단파괴라는 사실을 발견하였다. SC 구조 전단벽의 벽체 길이방향 거동은 파괴 시까지 벽체 외측의 강판이 내부 콘크리트를 구속하는 효과를 기대할 수 있으므로 연성능력이 향상되는 것이 확인되었다

• 대한기계학회논문집A
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• 제21권6호
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• pp.933-941
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• 1997

In the analysis of thin elastic structures such as plate and shell-like structures, classical lower-order theories like Kirchhoff and Reissner-Mindin theories are insufficient to describe the behavior of such structures in the region where the state of stresses is complex. On the other hand, the fully three dimensional theory of linear elasticity can provide desired analysis accuracy, but requires expensive computational implementation compared to the classical theories. This paper is concerned with the development of hierarchical models for elastic structures which can be used for hierarchical modeling for the analysis of such structures. Derivation and limit model analysis (when the thickness of structures tends to zero) of hierarchical models are presented together with a introduction of modeling error estimation. Also, numerical results supporting theoretical results are given.

• Journal of Advanced Marine Engineering and Technology
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• 제26권3호
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• pp.344-352
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• 2002

In the analysis of the 3 dimensional plate structures by the finite element method, the triangular elements are generally used for the global stiffness matrix of the analyzed system. But the triangular elements of the plates have some problems in the process of formulation and in the precision of analysis. The formulation of the finite element method to analyze 3 dimensional plate structures using quadrilateral elements is presented in this paper. The degree of freedom off nodal point is 6, that is, the displacements in the direction off-y-z is and the rotations about x-y-z axis and then the degree of freedom off element is 24. For the comparison of the analysis using triangular elements and quadrilateral elements, the rectangular plates subjected to the uniform load and a concentrated load on the centroid of the plate, for which the theoretical solutions have been obtained, are analyzed. The calculated deflections of the rectangular plates using the finite element method by the triangular elements and the quadrilateral elements are also compared with the deflections of the plates calculated by theoretical solutions. The defections of the rectangular plates calculated by the finite element method using the quadrilateral elements are closer to the theoretical solutions than the defections calculated by the finite element method using the triangular elements. The deflection of the centroid of plate, calculated by the finite element method, converges to that of theoretical solution as the number of elements is increased. This convergence is much more rapid for the case of using the quakrilateral elements than fir the case of using triangular elements.

• 한국구조물진단유지관리공학회 논문집
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• 제15권3호
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• pp.155-162
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• 2011

파형강판을 이용한 구조물은 기존의 철근콘크리트 구조물에 비하여 공기단축효과 및 경제성 등이 우수하고 유지관리비의 절감 측면에서 유리한 것으로 평가되고 있다. 최근 수로암거 및 생태 이동 통로등에 철근콘크리트 암거 대체 재료로 널리 활용되고 있으며 앞으로 적용실적이 더 증가할 것으로 예상된다. 파형강판을 사용한 구조물은 주로 아치형과 박스형의 두가지 형태이며, 아치형 구조물은 압축력에 의하여 설계하며 박스형 구조물은 플레이트 부재내의 모멘트에 의하여 설계한다. 따라서 본 연구에서는 기존의 대골형 파형강판보다 골의 피치와 깊이가 늘어난 성능 개선된 파형강판의 성능을 평가고하고 설계에 반영하기 위해 정적 압축 시험 및 휨시험을 수행하여 시험체 두께별 이음부의 극한강도 및 모멘트 강도를 검토 하였다.

• 한국공간구조학회논문집
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• 제7권5호
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• pp.39-48
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• 2007

최근, 구조물의 건설에서 경제적으로 개선된 구조시스템을 개발하는데 많은 역량이 집중되고 있다. 이에 따라, 구조물을 단순화시키고 시공기간을 단축시키고자 고성능강의 사용이 증가되고 있다. 구조물에 가해지는 단면적을 효과적으로 분배시키고, 자중감소와 용접개소를 줄일 수 있는 이점 등으로 인하여, 구조요소로서 LP강판에 대한 관심이 늘고 있다. 이러한 LP강판은 유럽에서 개발되어, 한국에서도 강구조물에 급속도로 사용이 증가되고 있으나, 이에 대한 구조적인 적용검토에 대한 연구는 아직 미흡한 상태이다. 본 연구에서는 유한요소해석의 고체요소을 이용하여 여러 단면형상에 대한 단면력과 처짐을 검토하여, 국내 생산 가능한 LP강판 제품에 대한 작업성, 효율성 및 경제성을 확인하였다.

• Steel and Composite Structures
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• 제42권2호
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• pp.277-288
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• 2022

A novel flat steel plate-concrete-corrugated steel plate (FS-C-CS) sandwich panel was proposed for resisting impact load. The failure mode, impact force and displacement response of the FS-C-CS panel under impact loading were studied via drop-weight impact tests. The combined global flexure and local indentation deformation mode of the FS-C-CS panel was observed, and three stages of impact process were identified. Moreover, the effects of corrugated plate height and steel plate thickness on the impact responses of the FS-C-CS panels were quantitatively analysed, and the impact resistant performance of the FS-C-CS panel was found to be generally improved on increasing corrugated plate height and thickness in terms of smaller deformation as well as larger impact force and post-peak mean force. The Finite Element (FE) model of the FS-C-CS panel under impact loading was established to predict its dynamic response and further reveal its failure mode and impact energy dissipation mechanism. The numerical results indicated that the concrete core and corrugated steel plate dissipated the majority of impact energy. In addition, employing end plates and high strength bolts as shear connectors could prevent the slip between steel plates and concrete core and assure the full composite action of the FS-C-CS panel.

• Smart Structures and Systems
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• 제22권3호
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• pp.249-257
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• 2018

This study contributes to evaluate multiphase topology optimization design of plate-like elastic structures with constant thickness and Reissner-Mindlin plate theory. Stiffness and adjoint sensitivity formulations linked to Reissner-Mindlin plate potential energy of bending and shear are derived in terms of multiphase design variables. Multiphase optimization problem is solved through alternative active-phase algorithm with Gauss-Seidel version as an optimization model of optimality criteria. Numerical examples verify efficiency and diversity of the present topology optimization method of Reissner-Mindlin elastic plates depending on multiphase and Poisson's ratio.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1998년도 춘계학술대회 논문집
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• pp.214-220
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• 1998

The determination of sound pressure radiated from periodic plate structures is fundamental in the estimation of noise levels in aircraft fuselages and ship hull structures. As a robust approach to this problem, here a very general and comprehensive analytical model for prediction the sound radiated by a vibration plate stiffened by periodically spaced orthogonal symmetric beams subjected to a sinusoidally time varying point load is developed. The plate is assumed to be infinite in extent, and the beams are considered to exert both line force and moment reactions on it. Structural damping is included in both plate and beam materials. From this theoretical model, the sound pressure levels on axis in a semi-infinite fluid(water) bounded by the plate with the variation in the loactions of an external using three numerical tools such as the Gauss-Jordan method, the LU decomposition method and the IMSL numerical package.