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연속 Skew Plate의 有限要素 解析 : 모멘트와 反力에 대해서
李外得 東義大學校産業技術開發硏究所 1987 産業技術硏究誌 Vol.1 No.-
This paper presents an analysis of stresses and reactions of an 45˚continuous skew plate by the finite element method under 5 cases of loading. And the corresponding rectangular plate is also analyzed to be compared with the former.
上載板의 邊長比의 변화에 따른 彈性地盤의 처짐 및 反力分布의 변화에 대한 해석
李外得 東義大學校産業技術開發硏究所 1992 産業技術硏究誌 Vol.6 No.-
When the elastic foundation is analysed by the Boussinesq's solution, the contact stress and deflection are influenced by not only the direct-upper loading but also the non-direct-upper loading. In this paper, when the ratio of the two sides' lengths of the upper rectangular loading plate varies in three typical cases, the contact stress and deflection are analysed.
李外得 東義大學校産業技術開發硏究所 1995 産業技術硏究誌 Vol.9 No.-
The consolidation behavior considering the interaction of the upper structure and the lower foundqation is analysed by the finite element method in this paper. And the corresponding variations of the effective stress, consolidation displacement, contact pressure and the bending moment of the upper structure are discussed.
李外得 東義大學校産業技術開發硏究所 1988 産業技術硏究誌 Vol.2 No.-
Two methods which can derive the stiffness matrix of the elastic half-space are proposed in this paper. Each method adopting Boussinesq's analytical solution can be summarized as following two steps. First, the flexibility matrix of the elastic half-space is derived.(Here, the force vector is distributing nodal forces) Second, the above flexibility matrix is converted into the stiffness matrix.(Here, the force vector is equivalent nodal forces)
이외득 東義大學校 産業技術開發硏究所 1996 産業技術硏究誌 Vol.10 No.-
To propose the theoretical guide for the design of the concrete pavement plate on the elastic foundation, a conventional concrete plate on the elastic foundation is analysed by the finite element method in this paper. Two conventional elastic foundations (hard and soft) are adopted and the deflection, contact pressure of the foundation and bending moment of the upper plate are compared for the two foundations. And the corresponding steel reinforcement is calculated.
李外得 東義大學校産業技術開發硏究所 1993 産業技術硏究誌 Vol.7 No.-
In this paper the behavior of elastic foundation is analysed when time-dependant consolidation is added to the immediate elastic deformation. The variation of the contact pressure and deflection according to consolidation is discussed here.
李外得 東義大學校産業技術開發硏究所 1998 産業技術硏究誌 Vol.12 No.-
When consolidation proceeds on the ground which supports upper concrete plate, because of the flexural rigidity of the upper structure, the contact pressure and the consolidation behavior exert influence on each other continuously. So it can be defined as non-linear interaction problem. In this paper, two iteration methods designed by the author to analyze this non-linear problem are presented. And the variations of the bending moment and deflection of the upper plate by the two methods according to the consolidation are compared.
李外得 東義大學校 産業技術開發硏究所 1997 産業技術硏究誌 Vol.11 No.-
In this paper, a method to handle the consolidation behavior of grounds which support upper structures is propose by the finite element method. The variation of the bending moments of the upper structure according to the consolidation is studied. And the corresponding reinforcement is also studied.
이외득,정진환 한국전산구조공학회 1997 전산구조공학 Vol.10 No.4
점토 지반 위에 상부 구조물이 축조되면 지반의 성질, 하중의 종류와 크기 등에 따라 즉각적인 침하가 생기고 어떤 형태의 접지압 분포가 이루어진다. 그러나 이후 시간의 경과와 더불어 2차적인 압밀침하가 추가되면 상부구조의 휨 강성 때문에 이 2차적인 추가 곡률에 대한 저항이 있다. 따라서 접지압 분포에 변화가 있게 되고 이 접지압 분포의 변화 때문에 압밀침하가 달라지며 압밀침하가 달라지면 다시 접지압 분포에 변화가 있게 되고 다시 압밀침하가 변하는 등의 하부지반과 상부구조와의 상호작용을 압밀침하가 끝날 때까지 계속하므로 지반 압밀 문제를 선형적으로 규명할 수 없다. 이 연구에서는 유한요소법으로 이 비선형 상호작용 문제의 근사적인 해석법을 시도하고 있다. When a structure is built on the consolidation ground, the instant elastic deflection occures according to the characteristics of the ground and the load on it. And the corresponding contact pressure is established. But, as time passes, the secondary consolidating deflection is added to the instant elastic deflection, the upper structure, due to its flexural rigidity, resist to the additional curvature. So the variation of the contact pressure occurs. And this new contact pressure exerts influence on the consolidation form again. The new consolidation form exerts influence on the contact pressure in return. This kind of interaction continues till all the consolidation of the ground is finished. So the consolidation problem can not be definded as the linear problem. This paper intends to scheme an approximate iteration method to analyse this non-linear interaction problem between the upper structure and the lower consolidation ground which supports the former.