Nogueira Rodrigo de Souza, Moritani Fabiana Yukiko, Christoforo André Luis, Monteiro Sergio Neves, de Azevedo Afonso Rangel Garcez, Dos Santos Herisson Ferreira, Lahr Francisco Antonio Rocco
Department of Structural Engineering, São Carlos School of Engineering, University of São Paulo, Av. Trabalhador São Carlense, 400 Centro, São Carlos 13566-590, SP, Brazil.
Department of the Civil Engineering (FCTUC), University of Coimbra, Rua Luís Reis Santos-Pólo II, 3030-788 Coimbra, Portugal.
Materials (Basel). 2024 Sep 13;17(18):4506. doi: 10.3390/ma17184506.
Tensile perpendicular to grain is an important mechanical property in the design of joints in timber structures. However, according to the standards, this strength can be determined using at least two different methods: uniaxial tensile and three-point static bending. In this context, the present paper aims to investigate the influence of these test methods on the determination of tensile strength perpendicular to grain of wood used in civil construction timber. Three wood species from Brazilian planted forests ( spp., , and ) were used in this investigation. Twelve specimens of each species were used for each test method investigated. Moreover, a statistical analysis was performed to propose an adjustment to the equation of the Code of International Organization for Standardization 13910:2014 for the three-point bending test. Tensile strength values perpendicular to grain obtained from the uniaxial tensile test were significantly higher than those determined by the three-point bending test. It is proposed that the tensile strength perpendicular to grain can be determined more precisely with adoption of coefficient 5.233 in the term [(3.75·Fult)/b·Lh] of the equation specified by the Code of International Organization for Standardization 13910:2014 for the three-point bending test.
横纹抗拉强度是木结构节点设计中的一项重要力学性能。然而，根据相关标准，该强度至少可以通过两种不同方法测定：单轴拉伸试验和三点静弯曲试验。在此背景下，本文旨在研究这些试验方法对土木建筑用木材横纹抗拉强度测定的影响。本研究使用了来自巴西人工林的三种木材（ 属、 属和 属）。每种木材针对每种所研究的试验方法制备了12个试件。此外，进行了统计分析，以对国际标准化组织13910:2014标准中三点弯曲试验的公式提出调整建议。单轴拉伸试验得到的横纹抗拉强度值显著高于三点弯曲试验测定的值。建议在国际标准化组织13910:2014标准规定的三点弯曲试验公式[(3.75·Fult)/b·Lh]中采用系数5.233，这样可以更精确地测定横纹抗拉强度。
