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  5. ANÁLISE ELASTO-PLÁSTICA DE BARRAS COM SECÇÃO DE PAREDE FINA NO CONTEXTO DA TEORIA GENERALIZADA DE VIGAS

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Preprint
Portuguese
2011

ANÁLISE ELASTO-PLÁSTICA DE BARRAS COM SECÇÃO DE PAREDE FINA NO CONTEXTO DA TEORIA GENERALIZADA DE VIGAS

0 Datasets

0 Files

$0 Value

Portuguese
2011
HAL (Le Centre pour la Communication Scientifique Directe)

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Nuno Silvestre
Nuno Silvestre

University of Lisbon

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Miguel Abambres
Dinar Camotim
Nuno Silvestre

Abstract

Neste artigo apresenta-se uma formulacao da Teoria Generalizada de Vigas (GBT) para a analise elasto-plastica de 1a ordem de barras com seccao de parede fina, submetidas a um carregamento e condicoes de fronteira arbitrarios. Depois de apresentar a derivacao das equacoes de equilibrio e o desenvolvimento de um elemento finito de barra, aplica-se e ilustra-se a formulacao para um conjunto de exemplos (casos 1 a 5). Nestes exemplos ilustrativos, consideram-se cinco vigas com seccao em I ou tubular quadrada, utiliza-se uma lei constitutiva elastica-perfeitamente plastica, e considera-se unicamente fenomenos de deformacao global da seccao, nomeadamente flexao uniforme, flexao nao uniforme, flexao composta com compressao, e torcao nao uniforme. Finalmente, validam-se os resultados da GBT por comparacao com os resultados do programa Abaqus, utilizando elementos finitos de barra e de casca. Geralmente, obtem-se uma excelente correlacao entre os resultados da GBT e do Abaqus, no que diz respeito a trajectorias nao-lineares de equilibrio, configuracoes deformadas e diagramas de tensoes. Nos casos em que tal correlacao nao e tao boa, apontam-se possiveis causas para as diferencas observadas.

How to cite this publication

Miguel Abambres, Dinar Camotim, Nuno Silvestre (2011). ANÁLISE ELASTO-PLÁSTICA DE BARRAS COM SECÇÃO DE PAREDE FINA NO CONTEXTO DA TEORIA GENERALIZADA DE VIGAS. HAL (Le Centre pour la Communication Scientifique Directe)

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Publication Details

Type

Preprint

Year

2011

Authors

3

Datasets

0

Total Files

0

Language

Portuguese

Journal

HAL (Le Centre pour la Communication Scientifique Directe)

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