This study focuses on the mechanical performance of pultruded glass fibre-reinforced polymer (GFRP) profiles developed for structural applications. Fibre content determines the tensile resistance of such components, and technical specifications describe this essential parameter. However, it does not determine the actual reinforcement efficiency. This manuscript illustrates the above inference both experimentally and analytically, investigating a GFRP square hollow section (SHS) profile available at the market. Standard tensile coupon test defines the material characteristics; a three-point-bending test determines the mechanical performance of the profile. A digital image correlation system captures deformations and failure mechanism of the SHS bending specimen. The developed finite element model with smeared reinforcement estimates the efficiency of the glass filaments, i.e. the ability to predict the actual mechanical resistance (flexural stiffness) under the assumption of the experimentally determined elasticity modulus of bare fibres. Scanning electron microscopy relates the composite microstructure and mechanical performance of the selected profile.

本研究侧重于为结构应用开发的拉挤玻璃纤维增​​强聚合物 (GFRP) 型材的机械性能。纤维含量决定了此类组件的抗拉强度，技术规范描述了这一基本参数。但是，它并不能确定实际的加固效率。这份手稿通过实验和分析说明了上述推论，调查了市场上可用的 GFRP 方形空心截面 (SHS) 型材。标准拉伸试样测试定义了材料特性；三点弯曲试验确定型材的机械性能。数字图像关联系统捕获 SHS 弯曲试样的变形和失效机制。开发的带有涂抹增强材料的有限元模型估计了玻璃丝的效率，即在裸纤维的实验确定的弹性模量的假设下预测实际机械阻力（弯曲刚度）的能力。扫描电子显微镜涉及所选型材的复合微观结构和机械性能。