Opazo-Vega Alexander, Rosales-Garcés Víctor, Oyarzo-Vera Claudio
Department of Civil and Environmental Engineering, Universidad del Bío-Bío, Concepción 4081112, Chile.
Department of Civil Engineering, Universidad Católica de la Santísima Concepción, Concepción 4090541, Chile.
Materials (Basel). 2021 Jan 7;14(2):269. doi: 10.3390/ma14020269.
is a fast-growing wood species with a relevant presence in countries like Australia and Chile. The sustainable construction goals have driven the search of structural applications for ; however, this process has been complicated due to the defects usually presented in these timber boards. This study aims to evaluate the dynamic elasticity modulus () of timber boards through non-destructive vibration-based tests. Thirty-six timber boards with different levels of knots and cracks were instrumented and tested in a simply supported condition by measuring longitudinal and transverse vibrations. In the first stage, the was calculated globally through simplified normative formulas. Then, in a second stage, the local variability of the was estimated using operational modal analysis (OMA), finite element numerical simulations (FEM), and regional sensitivity analysis (RSA). The positive correlation found between the global static modulus of elasticity and suggests that non-destructive techniques could be used as a reliable and fast alternative for the assessment of bending stiffness. Finally, the proposed method to estimate the local variability of based on the combination of OMA, FEM, and RSA techniques was useful to improve the structural selection process of timber boards for lightweight social housing floors.
是一种快速生长的木材品种，在澳大利亚和智利等国家有一定的分布。可持续建筑目标推动了对其结构应用的探索；然而，由于这些木板通常存在缺陷，这一过程变得复杂。本研究旨在通过基于振动的无损测试评估木板的动态弹性模量（）。对36块具有不同节疤和裂缝程度的木板进行仪器安装，并通过测量纵向和横向振动在简支条件下进行测试。在第一阶段，通过简化的规范公式全局计算。然后，在第二阶段，使用运行模态分析（OMA）、有限元数值模拟（FEM）和区域敏感性分析（RSA）估计的局部变异性。全局静态弹性模量与之间的正相关表明，无损技术可作为评估弯曲刚度的可靠且快速的替代方法。最后，基于OMA、FEM和RSA技术组合提出的估计局部变异性的方法，有助于改进轻质社会住房地板木板的结构选择过程。
