ANÁLISE NUMÉRICA DE CONEXÕES METÁLICAS EM ESTRUTURAS DE MADEIRA EM SITUAÇÃO DE INCÊNDIO

Mariana Masiero Fianco; Fabio Martin Rocha; Gisele Cristina Antunes Martins

doi:10.4025/revtecnol.v33i1.72636

Mariana Masiero Fianco Universidade Estadual de Maringá
Fabio Martin Rocha Universidade Federal do Triângulo Mineiro https://orcid.org/0000-0001-9939-8108
Gisele Cristina Antunes Martins Universidade Estadual de Maringá https://orcid.org/0000-0002-4670-456X

DOI: https://doi.org/10.4025/revtecnol.v33i1.72636

Keywords: Timber Structures, Steel Connections, Abaqus, Fire, Active Protection

Abstract

Steel connections play a crucial role in load transmission and structural integrity in timber elements, as their behavior governs the overall structure's performance. At high temperatures, the mechanical properties of materials change and they lose strength. With the aim of investigating the behavior of steel connection devices used for connecting timber structural elements, this study conducts thermal numerical analyses, considering two types of connections: one composed of only steel dowels and bolts, and the second composed of dowels and a steel plate. The numerical analyses were performed using the ABAQUS computational package, considering the advanced calculation method proposed by EN 1995-1-2, and validated with results from experimental tests. A difference in behavior was observed between steel bolts and dowels, with the bolt head region showing a greater temperature increase than that found in connections using dowels due to direct exposure to flames. The charring rate determined by numerical analysis shows more conservative values than those found in the standard and in experimental tests used as a basis in this article.

Downloads

Download data is not yet available.

References

Almeida, S. J. C. Análise do comportamento a temperaturas elevadas de elementos de aço formados a frio comprimidos considerando restrição ao alongamento térmico. 2012. Tese (Doutorado em Estruturas) – Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2012. DOI: 10.11606/T.18.2012.tde-10012013-085122.

Associação Brasileira de Normas Técnicas. ABNT NBR 7190-1: Projeto de estruturas de madeira – Parte 1: Critérios de dimensionamento. Rio de Janeiro, 2022.

Audebert, M. Approche expérimentale et modélisation du comportement au feu d'assemblages bois sous différents types de solliciations. 2010. Tese (Doutorado) – Université Clermont Auvergne, França, 2010. NNT: 2010CLF22086.

Audebert, M., Dhima, D., Taazount, M., & Bouchaïr, A. Thermo-mechanical behaviour of timber-to-timber connections exposed to fire. Fire Safety Journal, n. 56, p. 52-64. 2013. DOI: 10.1016/j.firesaf.2013.01.007.

Dhima, D. Vérification expérimentale de la résistance au feu des assemblages d’éléments en bois. Saint Remy les Chevreuses: CTICM, 1999.

Dhima, D., Audebert, M., Bouchaïr, A., & Taazount, M. Thermal and thermo-mechanical behaviour of timber connections in fire. In: Urban hábitat constructions under catastrophic events, COST Action C26, Napoli, Taylor & Francis Group. p. 189-194, 2010.

European Committee for Standardization. EN 1993-1-2: Design of steel structures – Part 1-2: General rules – Structural fire design. Brussels, Belgium, 2005.

European Committee for Standardization. EN 1993-1-8: Design of steel structures – Part 1-8: Design of joints. Brussels, Belgium, 2005.

European Committee for Standardization. EN 1995-1-2: Designer of timber structures – Part 1-2: General – Structural fire design. Brussels, Belgium, 2004.

European Committee for Standardization. EN 10025-2: Hot rolled products of structural steels – Part 2: Technical delivery conditions for non-alloy structural steels. Brussels, Belgium, 2004.

Figueiroa, M. J. M., & Moraes, P. D. Comportamento da madeira a temperaturas elevadas. Ambiente Construído, v. 9, n. 4, p. 157-174, 2009. DOI: 10.1590/s1678-86212009000400525.

Fredlund, B. Modelling of heat and mass transfer in wood structures during fire, Fire Safety Journal, v. 20, p. 39–69, 1993. DOI: 10.1016/0379-7112(93)90011-E.

International Organization for Standardization. ISO 834: Fire resistance tests: elements of building construction: part 1. General requirements. Geneva, 1999.

Janssens, M. Thermo-physical properties for wood pyrolisis models. Pacific Timber. Engineering Conference Gold Coast, Australia, 1994.

Laplanche, K. Etude du comportement au feu des assemblages de structures bois: approche expérimentale et modélisation. 2006. Tese (Doutorado) – Université Blaise Pascal Clermont-Ferrand et CSTB, França, 2006. NNT: 2006CLF21665.

Maia, B. B. Resistência de ligações pregadas em madeira. 2016. 71 f. Trabalho de Conclusão de Curso (Bacharelado em Engenharia Civil) – Universidade Tecnológica Federal do Paraná. Campo Mourão, 2016.

Molina, J. C. Análise do comportamento dinâmico da ligação formada por barras de aço coladas para tabuleiros mistos de madeira e concreto para pontes. 2008. Tese (Doutorado em Estruturas) - Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2008. DOI: 10.11606/T.18.2008.tde-04082008-111830.

Palma, P. Fire behaviour of timber connections. 2016. Tese (Doutorado) – ETH Zürich, Suiça, 2016. DOI: 10.3929/ethz-a-010836621.

Pinto, E. M. Determinação de um modelo para a taxa de carbonização transversal a grã para a madeira de E. citriodora e E. grandis. 2005. Tese (Doutorado em Ciência e Engenharia de Materiais) - Ciência e Engenharia de Materiais, Universidade de São Paulo, São Carlos, 2005. DOI: 10.11606/T.88.2005.tde-31052006-163139.

Valle, A. Rigidez de ligações com parafusos em estruturas de madeira laminada colada. 1999. Tese (Doutorado em Engenharia de Estruturas) – Escola Politécnica, Universidade de São Paulo, São Paulo, 1999.