In this paper, seven specimens were designed to study the influence of the height (h), width (b), and reinforcement ratio (ρ) of ring beam on the failure mode, bearing capacity, deformation, and equivalent stress–strain relation of joint core reinforced with ring beam for connection of polyvinyl chloride fiber‐reinforced polymer confined concrete column and reinforced concrete beam. The experimental results indicated that the crushing of concrete in the joint core dominated the failure of specimens. The ultimate, yield bearing capacity and axial strain decreased with the increase of height, while raised with the improvement of width or reinforcement ratio. The growth of the strains of reinforcement and concrete accelerated with the increment of height, while decelerated with the rise of width or reinforcement ratio. Subsequently, based on the local compression theory, confined concrete theory, and the principle of superposition of multiple confinement, considering the influence coefficient of joint height β_h and the enhancement coefficient of stirrups α_s, a new formula was proposed to estimate the ultimate bearing capacity of specimens under axial local compression. Then, on the basis of Mander's model, taking the correction parameter η into consideration, a new model of equivalent stress–strain relationship was established. Verification results showed that the models proposed in this research agreed well with the experimental results.

中文翻译：

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环梁增强聚氯乙烯纤维增强聚合物约束混凝土柱与钢筋混凝土梁连接节点核心的局部受压性能

本文设计了七个样本来研究高度（h），宽度（b）和增强比（ρ）的影响。环梁的破坏模式，承载力，变形以及环梁增强的连接芯连接聚氯乙烯纤维增强聚合物约束混凝土柱与钢筋混凝土梁的等效应力-应变关系。实验结果表明，接缝芯部的混凝土破碎占试样破坏的主要部分。极限，屈服承载力和轴向应变随着高度的增加而减小，而随着宽度或增强比的增加而增大。钢筋和混凝土应变的增长随着高度的增加而加速，而随着宽度或钢筋比的增加而减速。随后，基于局部压缩理论，密闭混凝土理论和多重约束叠加原理，β _ħ和的箍筋增强系数α_小号，一个新的公式，提出来估计下轴向局部压缩的试样的承载力。然后，在Mander模型的基础上，考虑校正参数η，建立了等效应力-应变关系的新模型。验证结果表明，本研究提出的模型与实验结果吻合良好。