Post-Fire Study of Strength and Stiffness of a Wooden Roof Structure

Abstract:

The characteristics of the behavior of building materials against the fire could realize a preponderant role in the result of an eventual burning situation, difficulting or contributing to reach a critical stage. The present study evaluated the mechanical properties in compression parallel to grain of five pieces of wood from the roof structure of a residence undergo the fire in the rural area of Itapeva/SP. The roof structure was built 25 years ago using wooden beams of the species Guarucaia (Peltophorum vogelianum), where the specimens were obtained. The objective of this work was to realize a case study about strength and stiffness in parallel compression to wood grain in a roof structure of a house located in Itapeva/SP, according to its level of thermal degradation, upon the occurrence of a real fire. In general, despite the many variables involved, the results based on woods of a real fire shown are consistent with the fire simulations provided by the literature.

• Periodical: Advanced Materials Research (Volume 1088)
• Pages: 660-663
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1088.660
• Online since: February 2015
• Authors: Elen Aparecida Martines Morales, Danilo Soares Galdino, Juliana Cortez-Barbosa, Cristiane Inácio de Campos, Victor Almeida de Araujo, Francisco Antonio Rocco Lahr, André Luis Christoforo, Sérgio Augusto Mello da Silva
• Keywords: Fire, High Temperatures, Mechanical Property, Wood

References

[1] E. M. Pinto: Proteção contra incêndio para habitações em madeira, [Thesis], EESC-USP, São Carlos, (2001), 157 p.

DOI: 10.11606/d.18.2001.tde-19052006-114716

[2] B. Östman, L. Tsantaridis, T. Hakkarainen, E. Mikkola, H. Brumer, and P. Piispanen: InnoFireWood – Innovative eco-efficient high fire performance wood products for demanding applications. Swedish Institute for Wood Technology Research, Stockholm, (2005).

[3] M. J. M. Figueroa, and P. D. Moraes: Comportamento da madeira a temperaturas elevadas. Ambiente Construído, Vol. IX, (2009), pp.157-174. DOI: 10. 1590/S1678-86212012000400004.

DOI: 10.1590/s1678-86212009000400525

[4] M. J. M. Figueroa: Coeficientes de modificação de propriedades mecânicas da madeira devidos à temperatura, [Thesis], Florianopolis, UFSC, (2012), 259 p.

[5] S. Yildiz, E. D. Gezer, and U. C. Yildiz: Mechanical and chemical behavior of spruce wood modified by heat. Building and Environment, Vol. 41, (2006), pp.1762-1766. DOI: 10. 1016/j. buildenv. 2005. 07. 017.

DOI: 10.1016/j.buildenv.2005.07.017

[6] M. R. Silva, G. O. Machado, J. O. Brito, and C. Calil-Junior: Strength and stiffness of thermally rectified eucalyptus wood under compression. Materials Research, Vol. 16, (2013), pp.1077-1083. DOI: 10. 1590/S1516-14392013005000086.

DOI: 10.1590/s1516-14392013005000086

[7] J. Jiang, J. Lu, Y. Zhou, Y. Zhao, and L. Zhao: Compression strength and modulus of elasticity parallel to grain of oak wood at ultra-low and high temperatures. BioResources, Vol. 9, pp.3571-3579.

DOI: 10.15376/biores.9.2.3571-3579

[8] Associação Brasileira de Normas Técnicas – ABNT: NBR 7190. Projeto de estruturas de madeira – anexo B, Rio de Janeiro, ABNT, (1997), pp.50-67.

DOI: 10.1590/s1517-707620160004.0098

[9] European Standard: Eurocode 5: design of timber structures, part 1-2: general rules-structural fire design, Brussels, European Committee for Standardization, (2002), 74 p.