Szczecina Michał
Faculty of Civil Engineering and Architecture, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel). 2023 Apr 29;16(9):3466. doi: 10.3390/ma16093466.
Laboratory research of wood-CFRP (carbon fiber reinforced polymer) structural elements, especially beams, is a scientific issue undertaken by many scientists. Research is often complemented with numerical analysis with the use of complex finite element method (FEM) models. Modern FEM software offers models that can reproduce such properties and phenomena as orthotropy and plasticity of wood and CFRP, delamination and mechanical behavior of adhesive layers, and damage of a strengthened element. The author of the paper reproduces numerical laboratory research of a four-point bending test of a glulam beam strengthened with CFRP tape. The main goal of the numerical research is an analysis of how the complexity of the FEM model influences the results of calculations, especially stress, deflection, and bearing capacity of the glulam beam. In some cases, a simpler model can be satisfactory, especially for a structural engineer, who takes into account serviceability limit states (permissible deflection of a structural member) and assumes that stress should not exceed the yield stress of timber.
木材-碳纤维增强聚合物（CFRP）结构构件，特别是梁的实验室研究，是许多科学家所从事的一个科学课题。研究通常会辅以使用复杂有限元法（FEM）模型的数值分析。现代有限元软件提供的模型能够再现木材和CFRP的正交各向异性和可塑性、胶粘剂层的分层和力学行为以及加固构件的损伤等特性和现象。本文作者再现了用CFRP胶带加固的胶合木梁四点弯曲试验的数值实验室研究。数值研究的主要目标是分析有限元模型的复杂性如何影响计算结果，特别是胶合木梁的应力、挠度和承载能力。在某些情况下，一个更简单的模型可能就足够了，特别是对于结构工程师来说，他们会考虑正常使用极限状态（结构构件的允许挠度），并假设应力不应超过木材的屈服应力。
