Engenharia Civil

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http://repositorio.ufes.br/handle/10/17613
Programa de Pós-Graduação em Engenharia Civil

Centro: CT
Telefone: (27) 4009 2146
URL do programa: http://www.civil.ufes.br/pos-graduacao/PPGEC

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Navegando Engenharia Civil por Assunto "Aço tubular - Estruturas"

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    Análise de pilares mistos retangulares preenchidos submetidos à flexo-compressão : proposição de equações e ferramenta computacional
    (Universidade Federal do Espírito Santo, 2025-12-09) Miranda, Glaubert Araujo; Ferreira, Walnório Graça ; https://orcid.org/0000-0002-2079-6048; https://lattes.cnpq.br/9453786966994911; Calenzani, Adenilcia Fernanda Grobério ; https://orcid.org/0000-0002-0936-9950; https://lattes.cnpq.br/9959808218883879; https://orcid.org/0000-0002-0810-7318; https://lattes.cnpq.br/3705408452006714; Oliveira, Romilde Almeida de ; https://orcid.org/0000-0002-6786-9080; https://lattes.cnpq.br/9272579827887449; Rossi, Alexandre ; https://orcid.org/0000-0001-9590-1554; https://lattes.cnpq.br/3946998323160911
    Contemporary construction increasingly demands structural designs employing slender columns, aiming to optimize architectural space and reduce material consumption while maintaining safety and structural efficiency. Among the available solutions, composite columns with concrete-filled rectangular sections stand out as an efficient and economical alternative, especially when combined with high-strength steel and concrete. The design of these columns is based on the provisions of ABNT NBR 8800:2024, which presents simplified models for the flexural–compression verification of compact, semicompact, and slender sections. However, the standard does not provide expressions for determining the neutral axis position in semicompact and slender sections, nor for calculating the moments corresponding to the onset of compressive plastification in semicompact sections or the initiation of yielding in the tension flange of slender sections, which limits its practical application. In this study, a computational tool was developed in MATLAB for verifying concrete-filled rectangular composite columns subjected to flexural–compression, based on the design models of ABNT NBR 8800:2024. As a central contribution of the research, mathematical formulations are proposed to determine the neutral axis position and the moments associated with the initial stages of plastification and yielding in semicompact and slender sections, respectively. The tool enables automated generation of M–N interaction curves, facilitating the analysis of the structural behavior of these columns and helping to address existing gaps in the standard. To assess the adherence of normative methods to actual behavior, 37 experimental tests of rectangular concrete-filled steel tube columns reported in the literature were processed using the developed tool and evaluated according to ABNT NBR 8800:2024 and AISC 360-22. The results showed that, for compact sections, Model II of ABNT NBR 8800:2024 provided the best estimates, with mean ratios of normalized-to-ultimate moments (!!"#$%/!&,) ranging from 0.80 to 0.87. For semicompact and slender sections, Model III of ABNT NBR 8800:2024 and Method IV of AISC 360-22 yielded the most consistent—though conservative—predictions, highlighting the increase in conservatism of these models as both the sectional slenderness and steel strength increase