Literature is deficient in exploring the structural behavior of concrete columns reinforced with glass fiber reinforced polymer (GFRP) bars and hybrid fibers. In the present study, the hybrid fiber reinforced concrete (HFRC) consisted of steel fibers and polypropylene fibers. A total of twelve GFRP reinforced HFRC (GHC) columns (250 mm in diameter and 1150 mm in height) were fabricated using longitudinal GFRP bars and transverse GFRP hoops/spirals and tested to failure under different loading conditions. The testing results concluded that all the GHC columns presented similar failure modes with the rupture of GFRP bars and GFRP hoops/spirals. The decrease in the spacing of GFRP transverse reinforcement resulted in an improvement in the axial strength (AS) and ductility of GHC columns. The eccentricity of loading resulted in a significant reduction in the AS of GHC columns. The proposed empirical model based on an experimental database of 270 fiber reinforced polymer reinforced concrete columns presented a good behavior for the experimental results. The comparative investigation solidly verifies the accuracy of the newly proposed empirical model for predicting the AS of GHC columns by assuming the compressive involvement of GFRP bars and the lateral confining pressure due to transverse GFRP reinforcement.

中文翻译：

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混合纤维混凝土短柱中GFRP箍筋和螺旋筋的试验和理论研究

文献缺乏探索用玻璃纤维增​​强聚合物 (GFRP) 钢筋和混合纤维增强的混凝土柱的结构行为。在本研究中，混合纤维增强混凝土 (HFRC) 由钢纤维和聚丙烯纤维组成。总共 12 根 GFRP 加固的 HFRC (GHC) 柱（直径 250 毫米，高度 1150 毫米）使用纵向 GFRP 杆和横向 GFRP 箍/螺旋制成，并在不同载荷条件下进行了破坏测试。测试结果得出结论，所有 GHC 柱都呈现出类似的失效模式，GFRP 杆和 GFRP 箍/螺旋断裂。GFRP 横向钢筋间距的减小导致 GHC 柱的轴向强度 (AS) 和延性的提高。加载的偏心导致 GHC 柱的 AS 显着降低。所提出的基于 270 根纤维增强聚合物钢筋混凝土柱的实验数据库的经验模型对实验结果表现出良好的行为。比较研究通过假设 GFRP 钢筋的压缩参与和横向 GFRP 钢筋导致的侧向围压，有力地验证了新提出的用于预测 GHC 柱 AS 的经验模型的准确性。