Análise da resistência ao cisalhamento paralelo as fibras segundo as normas ABNT NBR 7190:1997 e ISO 13910:2005

• Autor(a) principal: Matos, Gabriela da Silva [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155610; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-07-11/000886357.pdf
• topic: Madeira - Normas; Resistência ao cisalhamento; Normas tecnicas; Pinus elliottii; Eucalyptus saligna; Wood- Standards

Knowing the physical, anatomical, chemical, and mechanical wood properties is essential for its proper destination and its final use. For the structural use, technical standards establish methodologies tests to determine the mechanical properties of wood. In Brazil, the standard calculation for wooden structures is the NBR 7190: 1997 which is currently under review. Part of the proposals for the new version of the currently Brazilian wood standard include the review of the mechanical properties tests methods. It has been noted that several specimens for the tests methods has been tested by the commission of CE studies - 02: 126.10 of the Brazilian Technical Standards Association to determine the most representative methodology and specimen model to be considered as the test method. Within this context, the aim of this study was to analyze the shear strength parallel to the grain using the current version of the Brazilian standard ABNT NBR 7190: 1997 and also from the recommendations of the European standard ISO 13910:2005 for humidity of 12%. The simplified relationship between shear strength and compression parallel to the grain proposed by the ABNT NBR 7190: 1997 was studied as well. This study considered specimens of Pinus elliottii and Eucalyptus saligna for the evaluation of shear strength parallel to the grain. The results showed that the Brazilian standard had higher values for shear strength than the European standard. The differences in the shear strength parallel to the grain between Eucalyptus saligna and Pinus elliottii considering the two standards were approximately 35% and 65%, respectively, which indicate that the shear specimen proposed by the current Brazilian standard is still the best option for the shear strength parallel to the grain test. Regarding the simplified relationships the coefficients were 7.69% and 48% for eucalyptus and pine woods respectively, values higher than the values that the ABNT NBR 7190:1997...