Sokołowski Piotr Kazimierz, Kossakowski Paweł Grzegorz
Faculty of Civil Engineering and Architecture, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel). 2023 Feb 24;16(5):1870. doi: 10.3390/ma16051870.
The article presents an analysis of the static work of bent solid-wood beams reinforced with FRCM-PBO (fiber-reinforced cementitious matrix-p-phenylene benzobis oxazole) composite. In order to ensure better adhesion of the FRCM-PBO composite to the wooden beam, a layer of mineral resin and quartz sand was applied between the composite and the wooden beam. Ten wooden pine beams with dimensions of 80 × 80 × 1600 mm were used for the tests. Five wooden beams, unreinforced, were used as referenced elements and another five were reinforced with FRCM-PBO composite. The tested samples were subjected to a four-point bending test in which the static scheme of a simply supported beam subjected to two symmetrical concentrated forces was used. The main purpose of the experiment was to estimate the load capacity, the flexural modulus and the maximum bending stress. The time needed to destroy the element and the deflection were also measured. The tests were carried out based on the PN-EN 408: 2010 + A1 standard. The material used for the study was also characterized. The methodology and assumptions adopted in the study were presented. The tests confirmed a significant increase in destructive force by 141.46%, maximum bending stress by 118.9%, modulus of elasticity by 18.32%, time needed to destroy the sample by 106.56% and deflection by 115.58% compared to the reference beams. The unusual method of wood reinforcement presented in the article can be considered as innovative, characterized not only by a significant load capacity margin exceeding 141%, but also by simplicity of application.
本文对采用FRCM-PBO（纤维增强水泥基复合材料-对亚苯基苯并双恶唑）复合材料加固的弯曲实木梁的静态工作进行了分析。为确保FRCM-PBO复合材料与木梁有更好的粘结，在复合材料与木梁之间涂覆了一层矿物树脂和石英砂。试验使用了10根尺寸为80×80×1600mm的松木梁。5根未加固的木梁用作参考构件，另外5根用FRCM-PBO复合材料进行了加固。对测试样本进行了四点弯曲试验，采用了简支梁承受两个对称集中力的静态方案。实验的主要目的是评估承载能力、弯曲模量和最大弯曲应力。还测量了构件破坏所需的时间和挠度。试验依据PN-EN 408: 2010 + A1标准进行。对研究中使用的材料也进行了特性描述。介绍了研究中采用的方法和假设。试验证实，与参考梁相比，破坏力显著增加了141.46%，最大弯曲应力增加了118.9%，弹性模量增加了18.32%，样本破坏所需时间增加了106.56%，挠度增加了115.58%。本文提出的这种独特的木材加固方法可被视为创新方法，其不仅具有超过141%的显著承载能力余量，而且应用简单。
