Influência da posição dos anéis de crescimento da madeira na determinação de sua resistência ao cisalhamento paralelo às fibras

• Autor(a) principal: Rodrigues, Edson Fernando Castanheira
• Data de Publicação: 2023
• Outros Autores: Araujo, Victor Almeida De [UNESP], Arroyo, Felipe Nascimento, Almeida, João Paulo Boff, Christoforo, André Luis, Lahr, Francisco Antonio Rocco
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/s1678-86212023000200671; http://hdl.handle.net/11449/244849
• topic: Shear strength; Longitudinal-tangential plane; Longitudinal-radial plane; Mechanical characterization; Unfamiliar species. Hardwoods; Resistência ao cisalhamento; Plano longitudinal tangencial; Plano longitudinal radial; Caracterização mecânica; Espécies não usuais; Madeiras folhosas

Shear strength parallel to the fibers (fv0) is extremely important for the design of timber structures. Then, due to the lack of information related to a possible variation in the fv0of hardwood species according to the load application plane in relation to its growth rings/rays, this work performed tests for the determination of fv0according to NBR 7190-3 (ABNT, 2022b) varying load planes. Thereby, the load was applied on the longitudinal-tangential (LT) and longitudinal-radial (LR) planes of the species of caixeta (Simarouba amara) and roxinho (Peltogyne spp.). Through variance analysis (5% confidence), results did not point to statistical differences between fv0values when the load plane was changed. Therefore, the fv0of this species can be determined without significant risk of reduction according to ray/ring orientation. Furthermore, it was determined a ratio of fv0,k/fc0,kequal to 0.23 and 0.38 was determined for roxinho and caixeta, respectively. Thus, this result confirms the need for characterizing unfamiliar wood species when received on construction site, in order to save money and/or for safety reasons.