Geometric Imperfections
Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. Numerical analysis of compressed cold formed steel members considering initial geometric imperfections / Análise numérica de perfis de aço formados a frio comprimidos considerando imperfeições geométricas iniciais
The work presents a numerical analysis on cold-formed steel members compressed between pinned ends. One is about an inquiry carried through in finite elements in which it was studied the influence of initial geometric imperfections, existing in plain channels and lipped channels, under the aspects of its form, magnitude and signal. The geometric imperfection
Publicado em: 2007
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14. Theoretical and experimental analysis of cold-formed steel members under compression / Análise teórica e experimental de perfis de aço formados a frio submetidos à compressão
Cold-formed steel members present, in general, higher local slenderness than classical hot- rolled ones, which make them more prone to local buckling. Besides, thin-walled open sections have small torsional stiffness, and hence global torsional and flexural-torsional instability modes are many times more critical than global flexural ones. Also, distortional
Publicado em: 2006
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15. Comparative analysis of costs in the structure of buildings of armed concrete when projected by the NBR-6118:2003 and NBR-6118:1978 / Análise comparativa do custo da estrutura de edifícios de concreto armado quando projetados pela NBR-6118:2003 e NBR-6118:1978
In March of 2004 the new version of the Brazilian Code for design of concrete structures, the NBR 6118(2003), has replaced its predecessor the NBR 6118(1978). Amongst the new presented concepts, the greatest impact is related to the question of the durability of the concrete structures. The present work evaluates the influence of the new normative criteria,
Publicado em: 2006
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16. Análise numérica não-linear da flambagem local de perfis de aço estrutural submetidos à compressão uniaxial
Local buckling of plates normally presents large displacements in the normal direction of the medium plane of the plate due to small loading changes, with the axis of the bar remaining straight. This is a typical phenomenon of axially compressed steel columns, composed either with welded or hot- rolled structural shapes. When the plate buckles locally, there
Publicado em: 2006
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17. Verificação de pilares de aço à flexão composta considerando comprimentos de flambagem, forças horizontais fictícias e análise avançada. / Design of steel columns to bending and compression using effective length, notional loads and advanced analysis approaches.
This work discusses the main philosophies used to verify columns subjected to bending and compression in steel frames as well as the standards which recommend them. The effective length and notional loads approaches and the advanced analysis concept are discussed too. It is proposed a methodology of advanced analysis based on shell finite elements that accou
Publicado em: 2005
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18. NON-LINEAR BEHAVIOR AND INSTABILITY OF HYPERELASTIC MEMBRANES AND SHELLS / COMPORTAMENTO NÃO-LINEAR E INSTABILIDADE DE MEMBRANAS E CASCAS HIPERELÁSTICAS
This thesis investigates the large deformations of hyperelastic membranes and shells. The static nonlinear behavior and possible instabilities of the membrane are both analyzed. A detailed experimental analysis was carried out involving cylindrical membranes and shells with different geometries and initial axial forces and the influence of the axial force an
Publicado em: 2003
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19. Análise do comportamento e da resistência de pilares de aço eletrossoldados
In this work is presented a theoretical and experimental study of the behavior and resistance of high-frequency welded steel columns. At the Laboratory of Experimental Structural Analysis (LAEES) of the School of Engineering of Universidade Federal de Minas Gerais was a performed test of compression for simple supported members with different dimensions of s
Publicado em: 2002