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Showing 1 to 20 of 510 for “"Estruturas"”.
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Estruturas europeias de segurança : estruturas federais e o Grupo Trevi
… um caminho partindo do Grupo Trevi, das estruturas federais ou supranacionais existentes noutros contextos, abordar as estruturas europeias de segurança atuais e procurar um esboço do que serão as estruturas europeias de segurança no futuro. Referenciar, ainda, as necessidades de …
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Teoria Básica das Estruturas Conceptuais
As Estruturas Conceptuais são um formalismo de representação de conhecimentos baseado em grafos, os chamados grafos conceptuais. A teoria foi inicialmente desenvolvida por John Sowa há dez anos. Desde então, uma comunidade científica cada vez mais ampla tem-na utilizado em muitas áreas de aplicação …
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Transporte de estruturas offshore sobre balsa
This work deals with the structural behaviour of offshore structures like jacket and deck during transportation on deck barges. Initially, a theoretical basis related to this kind of problem is presented. The analyses, founded in a probabilistic theory, were performed considering 5 sets of …
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Vibrações de estruturas aporticadas espaciais estaiadas
A numerical tool for geometric nonlinear static and linear dynamic analysis of stayed spatial frame structures is presented. The numerical procedures and modelling technics are developed towards near future analysis of long span stayed bridges. The developed approach mapes use of well established …
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Estruturas prismáticas laminares: estudo teórico experimental
A study of a simple-span box-girdes model is presented. Analytical results, obtained by means of a computer program, are compared with experimental results. The adopted experimental procedure is criticized.
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Análise tridimensional de estruturas de edifício
The scope of this thesis is to develop a method for the analysis of building skeletons. The analysis takes into account the combined effect of columns, beams, shear walls and box shaped shear walls, under the action of vertical and horizontal loads. All the joint displacements are considered. The …
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Estruturas de solos: métodos de observação
Concerned with the study of soil structure. This study is divided in two parts. In the first part a literature review on the existing methods for the observation of soil fabric is made. This part is itself sub-divided in two other parts: - indirect methods, - direct methods. In the indirect …
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Efeitos térmicos em estruturas maciças de concreto
This work studies thermal effects on mass concrete structures, considering the incremental construction of the structure. Particular attention is given to problem of thermal stress which are find in gravity concrete dams, caused, mainly, by high increases of temperature and following gradual …
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Redistribuição de momentos fletores em estruturas hiperestáticas
Theoretical and experimental work on the application of plastic analysis to statically indeterminate reinforced concrete structures are presented herein. Fourteen two-span contiuos beams were tested to failure. These beams were dimensioned according to bending moment diagrams differing in 15% and …
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Estudos de processos de desempacotamento de estruturas hierárquicas
Folhas de papel amassadas são exemplos de estruturas hierárquicas que exibem muitas propriedades anômalas e são consideradas paradigmas dos sistemas complexos. Nos últimos anos, a área de estudos de superfícies amassadas têm apresentado enorme atividade com a produção de muitos resultados teóricos …
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"Shear Lag" em estruturas tubulares de paredes delgadas
Closed form solutions for deflections and stresses in thin-walled tubular beams are presented. The analytical equations are developed within an energy approach where shear strains and shear lag effects are considered. Explicit expressions for transverse deflections and stesses are given for …
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Avaliação da resistência do concreto em estruturas prontas
In this work we have tried to obtain the correlation between the results of partially destructive tests and the compressive strenght of standard concrete cylinders. The partially destructive testing methods used here were variations of the pull out and penetration tests. In both cases, the number …
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Um sistema automático de projeto de estruturas ótimas
A computer system for the automatic sizing of large-scale structures is developed, making use of an "optimali ty cri terion" algori thm, where inequali ty constraints are treated with the aid of slack-variables. Attention is focused on fixed geometry structures which can be idealized using finite …
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Alguns aspectos da análise dinâmica de estruturas offshore
The present work deals with the Deterministic Dynamic Analysis of Offshore Structures, by the: - Frequency Response Method; - Direct Integration Method. A study was done trying to identify the basic problems in order to make certain simplifications. These producted a better computacional …
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Análise de edifícios pelo método das estruturas equivalentes
The equivalent frame method for analysing reinforced concrete buildings which is described in the "ACI Building Code Requirements" (ACI-318-77) is suitable for analysing only the gravity loading. This paper adds the analysis of lateral load to the ACI concept. It also presents a new procedure, …
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Confiabilidade de estruturas reticuladas em ambientes de processamento paralelo
ln this work application of the First Order Second Moment reliability theory was used to asses the nominal failure probability of framed structures. A elast-plastic limit state function to structural elements and specialists methods were used for this purpose. A method to identify the most likely …
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Análise modal assintótica da estabilidade de estruturas reticuladas espaciais
This work presents a solution, by the Finite Element Method, for non-linear asymptotic analysis of elastic stability for space frames under conservative loads. The general non-linear equilibrium and critical equilibrium equations are obtained through a Lagrangian formulation, by analysing the …
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Análise estática de estruturas com não-linearidade física localizada
In this work algorithms are presented for the static analysis of structural systems with localized physical nonlinearity. In many types of structures that exhibit significant nonlinearity during static analysis, the nonlinear stiffness property is confined to a few predetermined localities. This …
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Análise de estruturas laminares pelo Método da Energia Discretizada
This work presents the Discrete Energy Method whose formulation is based on energy principles through a special form of finite differences. It does not depend on the boundary conditions and uses the concept of matrix of elements in which the structures are discretized. The objective of this work is …
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Dimensionamento automático de estruturas de edifícios em concreto armado
The design of reinforced concrete multistory building by computer is the goal of this work. A FORTRAN IV language system, where the stories are grids, which lie on elastic supports, was developed. The system input datas are the geometric, topologic and load features of the structure, as well the …
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