Fiber-reinforced polymer tube–confined steel fiber–reinforced concrete column is a novel composite column proposed recently, which consists of a traditional steel-reinforced concrete column and an external glass fiber–reinforced plastic tube for lateral confinement. In order to investigate the axial compression behavior of steel fiber–reinforced concrete columns, a total of 16 square specimens were fabricated and tested under axial monotonic and cyclic compressive loading. Three different configurations of inner shaped steels, including cross-shaped, box-shaped with wielding, and box-shaped without wielding were considered. Two thicknesses of glass fiber–reinforced concrete tubes were also considered as the main experimental parameters. On the basis of test results, a thorough analysis of the failure process based on strain analysis was discussed. The test results showed that steel fiber–reinforced concrete columns exhibited higher ductility and load capacity compared with fiber-reinforced plastic–confined plain concrete columns. Two quantitative indexes were proposed to measure the confinement of steel fiber–reinforced concretes. The axial cyclic mechanical behaviors were discussed through comparative analysis with monotonic behaviors. The remnant strains and modulus of the cyclic behaviors were also discussed.

中文翻译：

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方形GFRP管-约束钢筋混凝土组合柱的轴向单调循环受压性能

纤维增强聚合物管约束钢纤维混凝土柱是最近提出的一种新型复合柱，它由传统的钢筋混凝土柱和用于侧向约束的外部玻璃纤维增​​强塑料管组成。为了研究钢纤维混凝土柱的轴压行为，共制作了 16 个方形试件，并在轴向单调和循环压缩载荷下进行了测试。考虑了三种不同配置的内型钢，包括十字形、带挥动的箱形和不带挥动的箱形。两种厚度的玻璃纤维增​​强混凝土管也被认为是主要的实验参数。在测试结果的基础上，讨论了基于应变分析的失效过程的彻底分析。试验结果表明，与纤维增强塑料约束素混凝土柱相比，钢纤维混凝土柱具有更高的延性和承载能力。提出了两个量化指标来衡量钢纤维混凝土的约束。通过与单调行为的比较分析，讨论了轴向循环力学行为。还讨论了循环行为的残余应变和模量。通过与单调行为的比较分析，讨论了轴向循环力学行为。还讨论了循环行为的残余应变和模量。通过与单调行为的比较分析，讨论了轴向循环力学行为。还讨论了循环行为的残余应变和模量。