Módulo de elasticidade aparente em vigas roliças estruturais de madeira Pinus elliottii

Zangiácomo, André Luiz; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.1590/s1678-86212014000100002

Cited by 8 publications

(4 citation statements)

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“…O módulo de elasticidade (MOE) (Equação 1) foi calculado conforme o disposto na ABNT NBR 7190 [11] e ABNT NBR 9533 [15], porém, o ensaio de flexão estática a três pontos foi adaptado para a condição não destrutiva, admitindo deslocamento máximo igual a L/200 (ABNT NBR 7190 [11]). Tal deslocamento assegura a linearidade física e geométrica do material, sendo comumente empregado na determinação do MOE em ensaios não destrutivos, como nos trabalhos de CHRISTOFORO et al [29], ICIMOTO et al [30], ZANGIÁCOMO et al [31], SEGUNDINHO et al [32], e LAHR et al [33]. No ensaio de carregamento cíclico (fadiga), como o modelo esquemático (Figura 1b) dos apoios impossibilita a livre rotação do corpo de prova na seção dos apoios, uma vez que os parafusos pressionaram as amostras, o limite de deslocamento adotado (garantia de linearidade física e geométrica) foi igual a L/300.…”

Section: Materiais E Métodosunclassified

Avaliação do efeito da fadiga no módulo de elasticidade na flexão de painéis de madeira compensada

et al. 2020

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RESUMO Os painéis têm sido cada vez mais utilizados nas construções civis, rurais, entre outras, com destaque para os compensados pelo bom desempenho mecânico. Em muitas aplicações, os painéis podem estar sujeitos à ação de carregamentos cíclicos, e dessa forma, o conhecimento do efeito da fadiga é de fundamental importância. Todavia, as normas ABNT NBR ISO 2426 [12], NBR ISO 1096 [13], NBR 9489 [14] e NBR 9533 [15] que apresentam as classificações e os métodos de ensaios de painéis de madeira, não prescrevem requisitos para considerar o efeito da fadiga nas propriedades do material, o que motiva o desenvolvimento de pesquisas nessa temática. Este trabalho objetivou avaliar o efeito do número de ciclos de fadiga [NC] (0 - referência, 3600, 7200, 22500, 45000, 67500, 90000) para a frequência de oscilação igual a 1,0 Hz nos valores do módulo de elasticidade na flexão (MOE) de painéis comerciais de madeira compensada de eucalipto. Foram fabricados seis corpos de prova para cada número de ciclos, resultando em 36 amostras. Os resultados evidenciaram reduções significativas do MOE a partir de 22500 ciclos, implicando que 0, 3600 e 7200 ciclos forneceram resultados estatisticamente equivalentes. O modelo de regressão logarítmico mostrou ser o de melhor representatividade (R²=64,28%), apresentando-se como alternativa na previsão do decaimento do MOE para ciclos de fadiga superiores aos avaliados nessa pesquisa.

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Section: Materiais E Métodosunclassified

Avaliação do efeito da fadiga no módulo de elasticidade na flexão de painéis de madeira compensada

et al. 2020

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“…This fact, associated with the natural strength capacity of wood (Lahr et al, 2016), leads to an increase in the construction of slender elements. These elements are associated with lower consumption of materials and have several structural applications (Zangiácomo et al, 2014;Christoforo et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Influence of the Timber Elastic Modulus on the Geometric Nonlinear Structural Analysis of Truss Arches

et al. 2022

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In this work, it was numerically evaluated the influence of the modulus of elasticity parallel to the wood grain on the stability of trussed arches considering a nonlinear geometric analysis based on the Finite Element Method (FEM). This approach was carried out according to a positional formulation of the FEM, considering the structural nodes as main variables of the nonlinear equations system, whose resolution was obtained using the Newton-Raphson method. Altogether, seven arch models were evaluated, consisting of coniferous and hardwoods, with properties defined according to the strength classes of the Brazilian standard ABNT NBR 7190. The subroutines were written in MATLAB to solve the system of nonlinear equations and perform the analysis, including the graphical representation of the results and configurations of the trussed arch. Internal loads and displacements were obtained, in addition to the instability loads of the trussed arches. It was found that the instability load of the arch made with the stiffest hardwood (D60) was approximately equal to 700% of the instability load of the C20 coniferous class and equivalent to 257.8% of the D20 hardwood class-related load. It was verified that the modulus of elasticity significantly influences the nonlinear geometric behavior of the timber trussed arch. Furthermore, the nonlinear geometric analysis allowed calculating more accurate parameters and the verification of the stability of the structural system.

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“…Wood is a natural and renewable material that has been used by humans for various purposes since ancient times, such as shelters, tools, and supplies. Currently, this abundant material in Brazil has been used in the construction, furniture, pulp and paper, sports equipment, and musical instrument industry (Zangiácomo et al, 2014;Beech et al, 2017;Christoforo et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

EVALUATION OF THE Peltophorum vogelianum Benth. WOOD SPECIES FOR STRUCTURAL USE

et al. 2019

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Wood is a material used for various purposes since ancient times and is mainly used in civil and rural construction and industry. Due to the predatory exploitation of known trees, it is necessary to characterize new species for use in urban and rural structures as alternatives of species commonly used. This study aimed to determine the physical and mechanical properties of Guarucaia wood (Peltophorum vogelianum Benth.) based on the Brazilian standard ABNT NBR 7190 (1997) and estimate the strength and stiffness as a function of apparent density using the analysis of variance and also estimate stiffness as a function of its strength. The mechanical properties of P. vogelianum were considered compatible for structural use when compared with others used for the same purpose, being classified in the class C50 of dicotyledon species and evidencing the possibility of its use for structural purposes. According to the results of the poor quality in the fit of regression models in the statistical analysis, the strength and stiffness could not be estimated as a function of apparent density nor stiffness properties as a function of their respective strengths.

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Módulo de elasticidade aparente em vigas roliças estruturais de madeira Pinus elliottii

Cited by 8 publications

References 4 publications

Avaliação do efeito da fadiga no módulo de elasticidade na flexão de painéis de madeira compensada

Avaliação do efeito da fadiga no módulo de elasticidade na flexão de painéis de madeira compensada

Influence of the Timber Elastic Modulus on the Geometric Nonlinear Structural Analysis of Truss Arches

EVALUATION OF THE Peltophorum vogelianum Benth. WOOD SPECIES FOR STRUCTURAL USE

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