Bakalarz Michał Marcin
Department of Theory of Structures and Building Information Modeling (BIM), Faculty of Civil Engineering and Architecture, Kielce University of Technology, Al. Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel). 2024 Oct 8;17(19):4917. doi: 10.3390/ma17194917.
The strengthening, rehabilitation and repair of wooden beams and beams made of wood-based materials are still important scientific and technical issues. This is reflected, among other things, in the number of scientific articles appearing and the involvement of research centres around the world. This is also related to society's growing belief in the importance of ecological and sustainable development. This article presents an overview of the latest work in this field and the results of our own research on strengthening solid wooden beams with carbon-fibre-reinforced polymer (CFRP) sheets. The tests were carried out on full-size solid beams with nominal dimensions of 70 × 170 × 3300 mm. A 0.333 mm thick CFRP sheet was used for reinforcement. The research analysed various reinforcement configurations and different reinforcement ratios. For the most effective solution, a 46% increase in load capacity, 35% stiffness and 249% ductility were achieved with a reinforcement ratio of 1.7%. Generally, the higher the reinforcement ratio and coverage of the surface of the wood, the higher the strengthening effectiveness. The brittle fracture of wood in the tensile zone for unreinforced beams and the ductile crushing of wood in the compressive zone for reinforced beams were obtained. The most important achievement of this work is the description of the static work of beams in previously unanalysed configurations of strengthening and the confirmation of their effectiveness. The described solutions should extend the life of existing wooden buildings and structures and increase the competitiveness of wooden-based structures. The results indicate that, from the point of view of optimizing the cost of reinforcement, it is crucial to develop cheaper ways of combining wood and composite than to verify different types of fibres.
木质梁和木质基材料梁的加固、修复和补强仍是重要的科学技术问题。这一点尤其体现在发表的科学文章数量以及世界各地研究中心的参与情况上。这也与社会日益坚信生态和可持续发展的重要性有关。本文概述了该领域的最新研究工作以及我们自己关于用碳纤维增强聚合物（CFRP）薄板加固实心木梁的研究成果。试验在标称尺寸为70×170×3300毫米的全尺寸实心梁上进行。使用了厚度为0.333毫米的CFRP薄板进行加固。该研究分析了各种加固配置和不同的加固比例。对于最有效的解决方案，加固比例为1.7%时，承载能力提高了46%，刚度提高了35%，延性提高了249%。一般来说，加固比例和木材表面覆盖率越高，加固效果越好。未加固梁在拉伸区木材发生脆性断裂，加固梁在压缩区木材发生延性挤压破坏。这项工作最重要的成果是描述了以前未分析过的加固配置中梁的静力工作情况，并证实了其有效性。所描述的解决方案应能延长现有木结构建筑和结构的使用寿命，并提高木质结构的竞争力。结果表明，从优化加固成本的角度来看，开发更便宜的木材与复合材料结合方式比验证不同类型的纤维更为关键。
