The mechanical behavior of 66 carbon-fibre-reinforced polymer (CFRP)-confined concrete-filled steel tubular (CFST) short columns and 42 non-CFRP-confined CFST short columns under axial compression are studied. The typical failure modes and load–displacement curves of the specimen are obtained, and the stress mechanisms of the specimen are analysed. The effects of fiber-reinforced polymer (FRP) layers, core concrete strength and cross-section forms on the axial mechanical properties of CFST short columns are discussed. The test results show that there is a positive correlation between the improvement coefficient of bearing capacity and the confinement effect coefficient of FRP. Based on the superposition principle, the bearing capacity calculation formulas of circular and square CFST columns without CFRP confinement are proposed. On this basis, taking the confinement effect of FRP into account, the calculation formula of axial bearing capacity of FRP-confined CFST short columns is proposed. The comparison between the calculated values of the model and the measured values of the experiments shows that the model has good prediction effect.

中文翻译：

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FRP 侧限钢管混凝土轴压柱试验研究

研究了 66 根碳纤维增强聚合物 (CFRP) 约束钢管混凝土 (CFST) 短柱和 42 根非 CFRP 约束钢管混凝土短柱在轴压下的力学性能。得到了试件的典型破坏模式和载荷-位移曲线，分析了试件的受力机理。讨论了纤维增强聚合物 (FRP) 层、核心混凝土强度和截面形式对 CFST 短柱轴向力学性能的影响。试验结果表明，承载力提高系数与FRP的约束效果系数呈正相关关系。基于叠加原理，提出了无CFRP约束的圆形和方形钢管混凝土柱的承载力计算公式。以这个为基础，考虑FRP的约束作用，提出了FRP约束的钢管混凝土短柱轴压计算公式。模型计算值与实验实测值对比表明，该模型具有良好的预测效果。