Análise Numérica do Comportamento de Elementos de Madeira em Situação de Incêndio

Molina, Júlio César; Calil, Carlito; Kimura, Érica Fernanda Aiko; Pinto, Edna Moura; Regobello, Ronaldo

doi:10.4322/floram.2012.019

Cited by 8 publications

(10 citation statements)

References 2 publications

(7 reference statements)

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“…Knowledge of wood physical and mechanical properties allows its better use (Fiorelli & Dias, 2011;Carreira et al 2012;Molina et al, 2012. Because of the difficulty of characterizing wood species, they are often used without basic understanding of their properties, what leads to material waste (Andrade Jr. et al, 2014;Chen & Guo, 2017).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Wood Toughness in Brazilian Tropical Tree Species

et al. 2020

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Wood has been used for several purposes such as in civil and rural construction. Knowing wood mechanical behavior under short-term loading is essential for safer structural designs. However, wood toughness is a mechanical property little investigated for this purpose. Thus, this study aimed to evaluate, using exponential and polynomial regression models (linear, quadratic, and cubic), the possibility of estimating toughness as a function of apparent density, compression parallel to grain strength, and modulus of rupture in static bending. Thirty-six Brazilian tropical wood species from south of Roraima, Mato Grosso do Sul, and north and northeast of Mato Grosso were tested. Our results showed the significance and representativeness of all investigated fits, among which a cubic polynomial function is the most indicated for wood toughness estimates.

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Section: Introductionmentioning

confidence: 99%

Estimation of Wood Toughness in Brazilian Tropical Tree Species

et al. 2020

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“…As a rule, further verification of the results obtained using validation tests are required. According to Naser [18], Zhang et al [19] Molina et al [20], Couto et al [21], Regueira and Guaita [22], Dúbravská et al [23], this illustrates the serious need for a systematic and modern representation of various temperature-dependent building material properties. The development of such models is one of the first steps toward implementing a unified approach to fire assessment [17].…”

Section: Introductionmentioning

confidence: 99%

Determining the Charred Layer of Wooden Beams with Finite Element Analysis Based on Enthalpy Approach

et al. 2022

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In the process of computer modeling the formation of a charred layer in wood materials, it is important to implement the correct material data. In thermal analysis, there exist two different approaches of implementation: the temperature-dependent material data properties, heat capacity approach and enthalpy approach, which is not commonly used but which has a few advantages. This approach should be examined in more detail because it can solve the problem associated with inaccurate results at temperatures around 100 °C. This scientific paper deals with the assessment of the computer-aided fire modeling and simulation suitability based on the enthalpy approach for determining the charred layer of structural elements. The structural elements selected for testing were spruce wooden beams with rectangular and circular cross-sections. A finite element model (FEM) was created in ANSYS software. The model was validated by medium-scale fire tests data of the spruce wooden beams loaded with a radiation panel. Boundary conditions were identical to the medium-scale fire test. Due to the enthalpy approach, the temperature curves from the simulations also faithfully simulated the section with a constant temperature around 100 °C. Within the temperature profiles, the accuracy of simulations averaged 91.7%. The accuracy of the simulations describing the total area of the charred layer was 93.0% on average. Presented FEM can be used in the search for new construction solutions for wooden elements and modifications to the design of cross-sections of wooden beams or wooden joints so that they can better withstand fire conditions.

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“…O conhecimento das propriedades físicas e mecânicas da madeira possibilita seu melhor aproveitamento (Fiorelli & Dias, 2011;Carreira et al, 2012;Molina et al, 2012;Christoforo et al, 2013). Por causa de dificuldades em realizar ensaios para a caracterização das espécies, muitas vezes a madeira é utilizada sem o conhecimento básico de suas propriedades, levando, assim, ao desperdício desse material (Stolf, 2000).…”

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Influência do teor de umidade na propriedade de tenacidade de espécies florestais

Stolf¹,

Bertolini

Ferro

et al. 2014

Floresta Ambient.

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A tenacidade da madeira é uma propriedade mecânica de interesse em situações em que o carregamento por impacto deve ser considerado, encontrando aplicação em silos, pontes e fôrmas para estruturas de concreto armado. Apesar das recomendações do Anexo B - NBR 7190:1997, não tem sido usual a determinação da tenacidade na caracterização da madeira. Este trabalho objetivou investigar a influência do teor de umidade (30; 20; 12; 6; 0%) na obtenção da tenacidade da madeira angelim-saia (Vatairea sp), Eucalyptus grandis, Pinus elliottii e Corymbia citriodora, considerando a orientação dos anéis de crescimento em relação à direção da força de impacto. Análises estatísticas dos resultados por análise de variância (ANOVA) e teste de Tukey revelaram ser significativa a influência do teor de umidade na tenacidade apenas para a madeira de angelim-saia. Para as demais espécies, a análise estatística demonstrou resultados estatisticamente equivalentes, ou seja, o teor de umidade não foi influente na propriedade de tenacidade. Neste sentido, foi observado que o teor de umidade pode ser significativo na obtenção da tenacidade conforme a espécie e que maiores teores podem fornecer valores superiores desta propriedade.

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Análise Numérica do Comportamento de Elementos de Madeira em Situação de Incêndio

Cited by 8 publications

References 2 publications

Estimation of Wood Toughness in Brazilian Tropical Tree Species

Estimation of Wood Toughness in Brazilian Tropical Tree Species

Determining the Charred Layer of Wooden Beams with Finite Element Analysis Based on Enthalpy Approach

Influência do teor de umidade na propriedade de tenacidade de espécies florestais

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