In this paper, the axial compression behaviors of the PVC-FRP confined concrete (PVC-FRP-CC) column-RC beam joint strengthened with core concrete filled steel tube (CFST) were examined through a series of experiments, in which 11 specimens were conducted under axial load. Experimental parameters included the length of core steel tube, the height of joint, the stirrup ratio of joint, the steel ratio of core CFST and the spacing of CFRP strips. Test results indicated that all the specimens failed with column failure. The decrease in the height of joint or the spacing of CFRP strips increased the ultimate bearing capacity and yield capacity of the specimens, while the effect of other parameters was not obvious. After the specimens yielded, the decrease in spacing of CFRP strips slowed the stiffness degradation, while the decrease in stirrup ratio of joint or steel ratio of core CFST accelerated the stiffness degradation. On the basis of the experimental research, a finite element (FE) model was established by selecting reasonable constitutive relation of the materials, and the loading process of the specimens was simulated to reveal the working mechanism of the column-beam joints. What was more, parametric studies were further carried out based on the developed FE model, and some constructive measures were proposed.

本文通过一系列实验研究了用钢管混凝土芯（CFST）加固的PVC-FRP约束混凝土（PVC-FRP-CC）柱-RC梁节点的轴向压缩特性，其中11个试样在轴向载荷下进行。实验参数包括芯钢管的长度，接头的高度，接头的箍筋比，CFST芯的钢比和CFRP条的间距。测试结果表明，所有样品均因色谱柱失效而失效。节点高度的减小或CFRP条带间距的减小增加了试样的极限承载力和屈服能力，而其他参数的影响并不明显。试样屈服后，CFRP条间距的减小减慢了刚度的降低，CFST型钢的接缝或钢的箍筋比降低，加速了刚度的降低。在实验研究的基础上，通过合理选择材料的本构关系，建立了有限元模型，并模拟了试件的加载过程，揭示了梁柱节点的工作机理。此外，在已建立的有限元模型的基础上，进一步进行了参数研究，并提出了一些建设性的措施。