Abstract Few studies have prospectively examined the axial compressive behavior of FRP-confined steel-reinforced concrete (FCSRC) columns employing high strength concrete (HSC) with a compressive cylinder strength up to 120 MPa. In FCSRC columns, the encased steel sections would ensure a ductile response under the large axial deformation and provide additionally axial and shear load-carrying capacities. Therefore, the FCSRC column with HSC is a promising type of hybrid structural element that enables effective utilization of both HSC and high-performance FRP. In this study, a comprehensive experimental study has been conducted to evaluate the compressive performance of FCSRC columns with HSC, considering the effects of steel section shape and thickness of FRP tube. For comparison purpose, the compressive behaviors of FCSRC columns using normal strength concrete (NSC), concrete-filled FRP tubes (CFFTs), and steel-reinforced concrete (SRC) columns were also investigated. The load and deformation capacities, dilation behaviors, failure modes and failure mechanism, composite effect between constituent materials, and enhancement effect of FRP confinement on SRC columns were discussed in this paper. This study revealed that the use of HSC produced higher axial stiffness as well as higher axial compressive capacity for the FCSRC columns, although the deformation capacity was reduced as compared to the use of NSC.

中文翻译：

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FRP约束钢筋高强混凝土柱的抗压性能

摘要 很少有研究前瞻性地研究了采用高强度混凝土 (HSC) 的 FRP 约束钢筋混凝土 (FCSRC) 柱的轴向压缩行为，该柱的压缩圆柱强度高达 120 MPa。在 FCSRC 柱中，被包裹的钢截面将确保在大轴向变形下的延性响应，并提供额外的轴向和剪切承载能力。因此，带有 HSC 的 FCSRC 柱是一种很有前途的混合结构元件，可以有效利用 HSC 和高性能 FRP。在这项研究中，考虑了钢截面形状和 FRP 管厚度的影响，进行了一项综合实验研究，以评估具有 HSC 的 FCSRC 柱的抗压性能。为了比较，还研究了使用普通强度混凝土 (NSC)、混凝土填充 FRP 管 (CFFT) 和钢筋混凝土 (SRC) 柱的 FCSRC 柱的压缩行为。本文讨论了载荷和变形能力、膨胀行为、破坏模式和破坏机制、组成材料之间的复合效应以及 FRP 约束对 SRC 柱的增强效应。该研究表明，尽管与使用 NSC 相比变形能力有所降低，但使用 HSC 为 FCSRC 柱产生了更高的轴向刚度和更高的轴向抗压能力。讨论了构成材料之间的复合效应，以及FRP约束对SRC柱的增强作用。该研究表明，尽管与使用 NSC 相比变形能力有所降低，但使用 HSC 为 FCSRC 柱产生了更高的轴向刚度和更高的轴向抗压能力。讨论了构成材料之间的复合效应，以及FRP约束对SRC柱的增强作用。该研究表明，尽管与使用 NSC 相比变形能力有所降低，但使用 HSC 为 FCSRC 柱产生了更高的轴向刚度和更高的轴向抗压能力。