Representativeness analysis of shear strength parallel to fibers of class C60 of the Brazilian standard for timber structures

摘要

Wood is an excellent structural material, in addition to having excellent resistance in traction and compression. For correct dimensioning, the premises of the Brazilian standard are extremely valuable as a guide for structural engineers, as it exhibits standard values of resistance. Thus, this study aims to analyze whether the characteristic shear strength value parallel to class C60 fibers shown in the Brazilian standard matches the values obtained in the test of 23 Brazilian species, using the Bootstrap methodology with 1 million simulations. In addition, it sought to analyze, with regression models, whether it is possible to estimate the resistance property (f(v0)) of these 23 species as a function of apparent density, thus seeking to obtain quickly the properties of these species with only apparent density. Finally, it was possible to conclude that the Brazilian standard underestimates the shear strength of Brazilian woods, presenting a value 26 smaller to what actually resists, showing that the standard needs to be revised. Another point was that the regression models do not show significance, in other words, with the apparent density it was not possible to estimate the resistance property.