Análise do método proposto pela ABNT NBR 7190:1997 para determinação do valor característico à tração normal às fibras para madeiras de reflorestamento da região de Itapeva

• Autor(a) principal: Leite, Murilo Augusto Veríssimo [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203736; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2020-01-20/000924690.pdf
• topic: Madeira - Testes; Resistência à tração; Eucalipto; Pinus elliottii; Wood - Testing

The application of the characteristic value in the civil sector has been providing promising results in relation to safety concepts in projects, especially in the sizing. The characteristic value is obtained through the probabilistic method and by the centered estimator method, described in ABNT NBR 7190 (1997). The condition for using these methods is to assume of samples with a normal probability distribution. This work had analyze the normality of the data in the results obtained from mechanical tests of normal traction to the fibers, as well as to verify the size of sample to meet the requirements of normality, in addition to comparing the characteristic value by the probabilistic method and centered estimator and the coefficient of eccentricity of the centered estimator equation. To carry out this work reforested wood was used in the region of Itapeva-SP (Eucalyptus Grandis and Pinus E lliottii). Test specimens of normal traction were made to the fibers mechanical tests as recommended. resistance, a simulation was performed by the Bootstrap method with the aid of the software R, to verify the normality of the data, with the Shapiro Wilk test. To eucalyptus from 30 samples, a normal probability distribution was obtained and for the pinus 42 samples. The coefficient of eccentricity that best fit for the species of eucalyptus was 1,00 and for pine species 1,10