Comparison between exact and approximate methods for geometrically nonlinear analysis prescribed in design standards for steel and reinforced concrete structures.
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2022
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Resumo
Current practices in structural engineering demand ever-increasing knowledge and expertise
concerning stability of structures from professionals in this field. This paper implements standardized
procedures for geometrically nonlinear analysis of steel and reinforced concrete structures, with the objective
of comparing methodologies with one another and with a geometrically exact finite element analysis
performed with Ansys 14.0. The following methods are presented in this research: Load Amplification
Method, from NBR 8800:2008; the z γ coefficient method, from NBR 6118:2014; the P-Delta iterative
method and the αcr coefficient method, prescribed in EN 1993-1-1:2005. A bibliographic review focused on
standardized approximate methods and models for consideration of material and geometric nonlinearities is
presented. Numerical examples are included, from which information is gathered to ensure a valid comparison
between methodologies. In summary, the presented methods show a good correlation of results when applied
within their respective recommended applicability limits, of which, Eurocode 3 seems to present the major
applicability range. The treated approximate methods show to be more suitable for regular framed structures
subjected to regular load distributions.
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Global stability analysis, P-Delta iterative method, αcr coefficient, ANSYS
Citação
LECCHIA, L. de B. et al. Comparison between exact and approximate methods for geometrically nonlinear analysis prescribed in design standards for steel and reinforced concrete structures. Revista IBRACON Estruturas Materiais, v. 15, n. 1, 2022. Disponível em: <https://www.scielo.br/j/riem/a/wrqZk9t8mkcfVs7VBQ5jZtK/abstract/?lang=en>. Acesso em: 29 abr. 2022.