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Internal GFRP Reinforcement of Low-Grade Maritime Pine Duo Timber Beams

机译:低品位海上松木二重木梁的内部GFRP加固

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摘要

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.
机译:本文提出了一种实验性的结构规模测试方案,用于分析用内部玻璃纤维增​​强聚合物(GFRP)板增强的低品位海洋松(Ait。)二重奏木梁的抗弯性能。为此,生产并测试了面积为1200 g / m的单向GFRP板内部加固的三十(30)个非增强双梁和三十(30)个内部双梁。在双梁的受拉区中添加了较低的GFRP增强比(1.07%),平均弯曲刚度(EI)提高了8.37%,极限弯矩能力提高了18.45%。除了改善弯曲性能外,内部GFRP增强材料似乎还减少了木材奇异性和木材异质性对机械性能的影响,从而可以实现更好的特性值并以较小的可变性获得结果。

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