ANÁLISE NUMÉRICA DE PERFIS DE AÇO FORMADOS A FRIO EM SEÇÃO “I” CONSTITUÍDA POR DUPLO “U” SUBMETIDOS À COMPRESSÃO
Keywords:
Cold-formed steel; double channel; numerical analysis.Abstract
Although the section “I”, in double channel, is widely used, there are few studies on its behavior. Therefore, this work aims to contribute to a greater mastery over the structural behavior of this built-up sections. A nonlinear numerical analysis was performed using the Finite Element Method in the Ansys program, using existing experimental studies as a comparative database. The effect of length, number of connections, plate thickness and the presence of geometric and material imperfections on the normal strength of the columns. For this analysis, it was essential to consider the initial geometric imperfections, because there was a considerable reduction in the normal strength of the columns, thus getting closer to the values obtained experimentally. With regard to normative procedures, values against security were found in most cases, showing the need to conduct further studies in the area for the development of more appropriate formulations.
Downloads
References
ALMEIDA, S. J. C. Análise numérica de perfis de aço formados a frio comprimidos considerando imperfeições geométricas iniciais. Dissertação de Mestrado. Engenharia de Estruturas, Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2007.
AMERICAN IRON AND STEEL INSTITUTE. ANSI/AISI S100: North American specification for the design of cold-formed steel structural members. Washington, DC, AISI, 2016.
ANSYS. Structural nonlinearities. v.13.0, Houston, USA, 2011.
ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 14762: Dimensionamento de estruturas de aço constituídas por perfis formados a frio. Rio de Janeiro, 2010.
AUSTRALIAN STANDARD/NEW ZEALAND STANDARD. AS/NZS 4673: Cold-formed stainless steel structures. Sydney, Australia, 2001.
BECQUE, J.; RASMUSSEN, K. J. R. Experimental Investigation of the Interaction of Local and Overall Buckling of Stainless Steel I-Columns. Journal of Structural Engineering, v. 135 n.11, p. 1340-1348, 2009.
CHODRAUI, G. M. B. Análise teórica e experimental de perfis de aço formados a frio submetidos à compressão. Tese de Doutorado. Engenharia de Estruturas, Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2006.
LOURENÇO, P. B. Métodos computacionais na mecânica dos sólidos não linear. Relatório 99-DEC/E-1. Departamento de Engenharia Civil Universidade do Minho, Braga, Portugal, 1999.
MAIA, W. F.; VIEIRA JUNIOR, L. C. M.; SCHAFER, B. W.; MALITE, M. Experimental and numerical investigation of cold-formed steel double angle members under compression. Journal of Constructional Steel Research, v.121, p. 398 - 412, 2016.
ROCHA, M. S.; MAIA, W. F. Análise numérica de cantoneiras enrijecidas de aço formadas a frio submetidas à compressão. Revista da Estrutura de Aço, v.8, p.360 - 379, 2019.
SCHAFER, B. W. Finite strip analysis of thin-walled members. In: CUFSM: Cornell University – Finite Strip Method, 2001.
SCHAFER, B. W.; PEKÖZ, T. Computational modeling of cold-formed steel: characterizing geometric imperfections and residual stresses. Journal of Constructional Steel Research, v. 47, p. 193-210, 1998.