This paper presented an experimental investigation on the Polyvinyl Chloride-Carbon Fiber Reinforced Plastic (PVC-CFRP) Confined Concrete (PVC-CFRP-CC) stub columns under axial compression. A total of two PVC Confined Concrete (PVC-CC) columns and ten PVC-CFRP-CC columns were conducted. The effect of spacing of CFRP strips on mechanical behaviors of PVC-CFRP-CC stub columns was investigated. Meanwhile, the influence on mechanical behaviors was also analyzed in terms of equivalent confining effect coefficient. Test results demonstrated that PVC-CC stub columns failed by the buckling of PVC tube while the PVC-CFRP-CC stub columns were damaged by the tensile fracture of CFRP strips and the cracking of PVC tube. The bearing capacity of PVC-CFRP-CC stub columns increased gradually as the equivalent confining effect coefficient increased while the bearing capacity decreased with the increase of spacing of CFRP strips. With the decrease of spacing of CFRP strips or the improvement of equivalent confining effect coefficient, the confinement of PVC-CFRP tube on core concrete enhanced, the ultimate compressive strain of the PVC tube and the ultimate tensile strain of the CFRP strips increased. Based on a large and up-to-date test data including measured data in this study and data collected from the literatures, a modified model for conveniently predicting the stress–strain relation of PVC-CFRP-CC stub columns was established and verified the test data with good agreement.

本文介绍了在轴向压缩下对聚氯乙烯-碳纤维增强塑料（PVC-CFRP-CC）承压混凝土（PVC-CFRP-CC）短柱进行的实验研究。总共进行了两个PVC约束混凝土（PVC-CC）柱和十个PVC-CFRP-CC柱。研究了CFRP条带间距对PVC-CFRP-CC短柱的力学行为的影响。同时，还根据等效约束效应系数分析了对力学行为的影响。测试结果表明，PVC-CC短管柱因PVC管的屈曲而失效，而PVC-CFRP-CC短管柱因CFRP条的拉伸断裂和PVC管的开裂而损坏。PVC-CFRP-CC短柱的承载力随着等效约束系数的增加而逐渐增大，而承载力随着CFRP条带间距的增加而减小。随着CFRP带间距的减小或等效围挡效果系数的提高，PVC-CFRP管在芯混凝土上的密闭度增加，PVC管的极限压缩应变和CFRP带的极限拉伸应变增大。基于大量的最新测试数据（包括本研究中的测量数据和从文献中收集的数据），建立了一种方便地预测PVC-CFRP-CC短管柱应力-应变关系的改进模型，并验证了该测试数据具有良好的一致性。随着CFRP带间距的减小或等效围挡效果系数的提高，PVC-CFRP管在芯混凝土上的密闭度增加，PVC管的极限压缩应变和CFRP带的极限拉伸应变增加。基于大量的最新测试数据（包括本研究中的测量数据和从文献中收集的数据），建立了一种方便地预测PVC-CFRP-CC短管柱应力-应变关系的改进模型，并验证了该测试数据具有良好的一致性。随着CFRP带间距的减小或等效围挡效果系数的提高，PVC-CFRP管在芯混凝土上的密闭度增加，PVC管的极限压缩应变和CFRP带的极限拉伸应变增加。基于大量的最新测试数据（包括本研究中的测量数据和从文献中收集的数据），建立了一种方便地预测PVC-CFRP-CC短管柱应力-应变关系的改进模型，并验证了该测试数据具有良好的一致性。