This investigation explores the structural performance of glass-fibre-reinforced polymer (GFRP)-reinforced concrete columns incorporating hybrid fibres (GHFRC columns) under different loading conditions. The hybrid-fibre-reinforced concrete consisted of two kinds of fibres (steel and polypropylene). A total of nine GHFRC specimens with a diameter of 250 mm and a height of 1150 mm were fabricated and tested to failure. A three-dimensional finite element model (FEM) was developed for the GHFRC specimens using ABAQUS 6.14. The definition of hybrid-fibre-reinforced concrete was performed using an improved concrete damaged plasticity model and the definition of GFRP material was performed by using a linear elastic model. The test results revealed that the ductility of GHFRC columns was improved with the reduction in the ligature spacing. The column eccentricity showed higher ductility indices than concentric columns. The loading eccentricity resulted in a substantial decrease in the axial strength of GHFRC columns. The close correlation between tests and FEM results validates the applicability of FEM. A mathematical model was suggested for predicting the axial strength of GHFRC specimens by taking into account the axial influence of GFRP bars and the confining influence of GFRP ties.

中文翻译：

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具有混合纤维的混凝土柱中 GFRP 钢筋的效率：实验和有限元分析

本研究探讨了玻璃纤维增​​强聚合物 (GFRP) 增强混凝土柱在不同载荷条件下的结构性能，其中包含混合纤维（GHFRC 柱）。混合纤维增强混凝土由两种纤维（钢和聚丙烯）组成。总共制造了九个直径为 250 毫米、高度为 1150 毫米的 GHFRC 试样并进行了失效测试。使用 ABAQUS 6.14 为 GHFRC 试样开发了三维有限元模型 (FEM)。混合纤维增强混凝土的定义采用改进的混凝土损伤塑性模型，GFRP材料的定义采用线弹性模型。测试结果表明，GHFRC 柱的延展性随着结扎间距的减小而提高。柱偏心率显示出比同心柱更高的延展性指数。加载偏心导致 GHFRC 柱的轴向强度显着降低。测试与有限元法结果之间的密切相关性验证了有限元法的适用性。通过考虑GFRP筋的轴向影响和GFRP拉杆的围压影响，提出了一种预测GHFRC试件轴向强度的数学模型。