Abstract
The Brazilian Code ABNT NBR 7190 (1997) is currently under review process and one of the proposals is the change and add of some test procedures. Several specimen geometric configurations and test conditions have been evaluated by the study committee CE-02:126.10. The aim of this paper was the analysis of the tensile strength perpendicular to the grain through the current Brazilian Code and from an adaptation of ISO 13910 (2005). Pine and Indian Cedar were used and simplified relationships were proposed. Numerical simulations were performed to identify the stress distributions in the specimens. The results obtained by ISO 13910 (2005) did not differ statistically for the two species. Brazilian standard method cedar had a higher strength value than pine. The simplified ratios obtained ranged between 0,017 and 0,123. The numerical simulations of ISO 13910 (2005) specimens showed predominant failure by tension in the lower fiber due to stress concentration.
Highlights
AND OBJECTIVESWood is a natural material with variations in strength, elasticity, among other properties, which can occur as a function of the variation in the angle of the fibers, presence of defects, or even as a function of the percentage of moisture present in the wood (Rocha et al, 2018)
The aim of this paper was the evaluation of two different specimen geometric configurations and normative test methods proposed by the Brazilian standards ABNT NBR 7190 (1997) and an adaptation of ISO 13910 (2005) to compare the results obtained by the two methods
Mascia et al (2020) reported ft90 values ranging from 2 MPa to 8 MPa, close to the values obtained from the ABNT NBR 7190 (1997) test method, while Schlotzhauer et al (2019) reported strength values from 7.2 MPa to
Summary
AND OBJECTIVESWood is a natural material with variations in strength, elasticity, among other properties, which can occur as a function of the variation in the angle of the fibers, presence of defects, or even as a function of the percentage of moisture present in the wood (Rocha et al, 2018). The Brazilian Code for wood structures ABNT NBR 7190 (1997) is under review and, the test method PN 02:126.100001-3 contains the main test procedures for wooden specimens with structural dimensions. This test method is based on the ISO 13910 (2005) standard, and tests are required for the validation of this test procedure in Brazil. Tests that have been carried out to characterize the mechanical properties of wood are based on defect-free specimens and with standardized dimensions, regardless of the type of wood used (Almeida et al, 2020; Costa et al, 2020). Tests based on Annex B of ABNT NBR 7190 (1997) are recommended for native woods, while tests according to PN 02:126.10-0001-3 are related to reforestation woods with structural dimensions
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