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Artigo Científico | Análise de Tensões Residuais | Português | 07/02/2007
Autores: Andréia Cristina Barroso Almeida, Armando Cesar Campos Lavall
Palavras-chave: advanced analysis, análise avançada, distributed–plasticity, material and geometric nonlinearities., não–linearidades física e geométrica, plasticidade distribuída, residual stresses, tensões residuais
Resumo: As tensões residuais existentes nos perfis de aço, decorrentes dos processos de fabricação, são um dos principais fatores que afetam a resistência dos pilares, principalmente, em regiões de esbeltez intermediária (40 < l/r
Abstract: Residual stresses due to manufacturing process in steel sections reduce the column strength. This reduction is more important for medium slenderness ratio(40 < l/r < 120). So, the column strength curve should be based on analysis that includes the effect of residual stresses through the cross section. This paper presents a geometrically exact finite element formulation to consider material and geometric nonlinearities of steel plane frames, including distributed–plasticity analysis. The Corrotacional technique is used to obtain the element's tangent stiffness matrix, considering self equilibrated residual stresses. The formulation accuracy is showed in the examples. The strengths predicted by the proposed formulation are compared with those predicted by the NBR 8800/06 review project, proving the efficiency of this approach as an Advanced Analysis Method.
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