Balmori Jose-Antonio, Basterra Luis-Alfonso, Acuña Luis
Research group of Timber Structures and Wood Technology, University of Valladolid, Avenida de Salamanca, 18, 47014 Valladolid, Spain.
Materials (Basel). 2020 Jan 24;13(3):571. doi: 10.3390/ma13030571.
This paper presented an experimental structural-scale test campaign used to analyze the flexural behavior of low-grade maritime pine ( Ait.) duo timber beams reinforced with an internal glass fiber-reinforced polymer (GFRP) sheet. For this purpose, thirty (30) unreinforced duo beams and thirty (30) duo beams internally reinforced with a unidirectional GFRP sheet with an areal mass of 1200 g/m were produced and tested. The addition of a low GFRP reinforcement ratio (1.07%) in the tension zone of the duo beams provided an average improvement of 8.37% in bending stiffness (EI) and an increase of up to 18.45% in ultimate moment capacity. In addition to this improved bending behavior, the internal GFRP reinforcements seemed to decrease the influence of wood singularities and wood heterogeneity on mechanical properties, which allowed for better characteristic values to be reached and for the achievement of results with less variability.
本文介绍了一项实验性结构规模测试活动，用于分析用内部玻璃纤维增强聚合物（GFRP）板加固的低等级海松（Ait.）双木梁的抗弯性能。为此，制作并测试了30根未加固的双木梁和30根内部用面质量为1200 g/m的单向GFRP板加固的双木梁。在双木梁受拉区添加低GFRP增强比率（1.07%），使抗弯刚度（EI）平均提高了8.37%，极限弯矩承载力提高了18.45%。除了这种改善的抗弯性能外，内部GFRP增强材料似乎降低了木材缺陷和木材不均匀性对力学性能的影响，这使得能够达到更好的特征值，并以较小的变异性取得结果。
