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Showing 1 to 20 of 89 for “"Método dos elementos finitos"”.
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Método dos elementos finitos aplicado ao problema de escavação
Analysis of a bi-dimensional excavation using the Finite Element Method. The soil is considered to be isotropic and non-linear material, although following Hooke's law for small increments of stresses. The mechanical parameters of the soil are function of the state of stresses. A finite element …
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Análise dinâmica de placas pelo método dos elementos finitos
The main purpose of the present work is to study the dynamic behavior of plates under specified time-varying loads and moving forces. Initially a brief exposition of the variational formulation concerning the dynamics of thin plates is presented and the finite element method is applied to this …
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Análise de estabilidade elástica pelo método dos elementos finitos
Study the elastic stability of structures, using the finite elements method. In the first part it is presented an overall view of the stability criteria, and the essential differences among them. Using the criteria of the stationary value of the potential energy we have modified the method of …
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Análise de aberturas subterrâneas circulares pelo método dos elementos finitos
The present dissertation is about a two-dimensional computer program for the analysis of underground openings under plane-strain conditions. The numerical analyses are carried out by means of Finite Element Method (FEM) the quadratic isoparametric element being used. Linear and bi-linear elastic …
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Análise não-linear de estruturas laminares pelo método dos elementos finitos
ln this work, the finite element method is applied to problems involving the geometrically non-linear behaviour of surface structures, subjected to static and dynamic loads. Two kinds of formulations are studied. ln the first one, through isoparametric degenerated elements, the tridimensional …
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A análise elasto-plástica de túneis pelo método dos elementos finitos
In this paper a finite element program for the elastoplastic plane strain analysis was developed. Its purpose is to compute the displacements and stresses in soil and rock masses, and in tunnel supporting elements. Basic characteristics of other tunnel design methods have also been discussed. At …
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Análise não-linear geométrica de pórticos tridimensionais pelo Método dos Elementos Finitos
In this work, the finite element method is applied to problems involving the geometrically nonlinear behaviour of framed structures. Two consistent formulations of three-dimensional beam element are presented. In the first one, the element is straight with constant cross section and the …
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Análise estática e dinâmica de vigas sandwich pelo método dos elementos finitos
In view of the static and dynamic analysis of sandwich beams submitted to axial loads as well as for the determination of instability critical loads the Finite Element Method has been used in the present work. The developed elements are also applied to beams where the shear strain has been taken …
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Processo semi-analítico para análise de estruturas pelo método dos elementos finitos
Static linear analysis is applied to three dimensional problems through the semi-analytical finite element process, making use of orthogonal functions. Prismatic structures and axi-symmetric structures with non-symmetrical loads, are studied using two finite elements. The first is a isoparametric …
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Dinâmica de estruturas reticuladas sob cargas móveis, pelo método dos elementos finitos
The dynamic analysis of framed structure, in particular, beams and plane frames, is the purpose of this work. Using the finite element method applied to structural dynamics we present the necessary theory to obtain the response due to concentraded and distributed moving loads on beams and on plane …
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Análise do controle da água em escavações pelo método dos elementos finitos
The Finite Element Method is applied to steady state seepage analysis and to the dewatering of excavations. The analysis of open pumping and of water table lowering in cases with complex boundary conditions is possible by programs that determine the free surface location. The application of the …
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Estudo e aplicação do método dos elementos finitos a barragens de terra
Static, two-dimensional analysis of earth dams is conducted by the Finite Element Method, using isoparametric elements. A study of the method and element used is made and a computer program is developed. Comments on linear and non linear simulations of an earth dam construction are made; some …
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Método dos elementos finitos aplicado a análise não linear de vigas Timoshenko-Vlasov
Esta pesquisa estuda o Método dos Elementos Finitos aplicado a análise não-linear de vigas Timoshenko-Vlasov. A princípio, objetiva-se investigar a formulação não linear tridimensional de vigas para simular estruturas reticuladas, considerando efeitos de empenamento da seção transversal como uma …
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Análise limite de lajes via programação linear através do método dos elementos finitos
Based upon the Yield-Line Theory (Johansen, 1932) a non-oonventional finite element is formulated for the analysis of slabs whose oonstitutive law is defined through a moment-rotation curve at the section transversal to the yield-line. Thus only with the displacement perpendicular to the slab …
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Análise de fundações submetidas a esforços de arrancamento pelo Método dos Elementos Finitos
The purpose of this work is to study the behaviour of foundations subjected to pull-out forces, using the Finite Element Method. ln this subject, the results of field tests in footings and pier-foundations are analysed. These tests were made on a gneissic residual soil, near The City of Rio de …
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O método quasi-finito e o método dos elementos finitos para campos térmicos
A review of the classical finite element method is given together with a study of the numerical techniques to be used to deal with transient and steady state thermal fields. The quasi-finite approach is also used with various aspects of the the strategy presented in detail. This method is applied …
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Aplicação do método dos elementos finitos a problemas planos da mecânica de fratura
In this work the problem of brittle fracture is discussed, attempting to obtain the stress intensity factors. In doing so a hybrid displacement finite element model is used. The fundamental concepts and theories of Fracture Mechanics are presented, firstly. Then, a hybrid functional, in which the …
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Resposta dinâmica de estruturas reticuladas a cargas móveis, pelo método dos elementos finitos
Studies the dynamic behavior of framed structures under moving loads by means of the finite element method. Three different types of loadings are idealized and impact factors determined for them, being developed computer programs for dynamic analysis of beams and plane frames. The structure-loading …
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Análise de pilares esbeltos de concreto armado confinados através do método dos elementos finitos
… não-linear fisico e geométrico, baseado no Método dos Elementos Finitos, para a análise de pilares esbeltos de concreto armado, sob estado triplo de tensões. Neste estudo, são utilizados elementos finitos isoparamétricos tridimensionais para o concreto e um modelo incorporado de armadura. O …
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