The primary objectives of this study were to experimentally investigate the shear characteristicsof the interface between an existing RC column and a reinforced concrete (RC) beam added to the existing RC column, and to propose a formula for estimating the shear capacity of the beam-column interface. The major test variables consisted of concrete strength, added steel reinforcement ratio and shear span to depth ratio. Failure characteristics, displacements at the loading point, slips of the beam-column interface, and shear capacities of the beam-column interface were analyzed. Test results indicate that both the shear capacity of the beam-column interface and the corresponding interfacial slip increased with a decrease in shear span to depth ratio. In addition, as concrete strength grew, the shear capacity of the beam-column interface increased, but the interfacial slip corresponding to the interfacial shear capacity remained almost unchanged. Moreover, both the shear capacity of the beam-column interface and the corresponding interfacial slip increased with an increase in the longitudinal steel reinforcement ratio of the added RC beam. A formula for predicting the shear capacity of the beam-column interface was developed. The test results validate the proposed formula and provide important guidance for the design of the RC beam added to the existing RC column.

这项研究的主要目的是通过实验研究现有RC柱与添加到现有RC柱中的钢筋混凝土（RC）梁之间的界面的剪切特性，并提出估算梁柱抗剪承载力的公式。接口。主要测试变量包括混凝土强度，添加的钢筋比例和剪切跨度与深度之比。分析了其破坏特性，载荷点的位移，梁柱界面的滑移以及梁柱界面的剪切能力。试验结果表明，梁柱界面的抗剪承载力和相应的界面滑移都随着剪切跨度与深度之比的减小而增加。此外，随着混凝土强度的提高，梁柱界面的抗剪承载力增加，但是对应于界面剪切能力的界面滑移几乎保持不变。而且，梁柱界面的抗剪承载力和相应的界面滑移都随着所添加的RC梁的纵向钢筋比的增加而增加。建立了预测梁柱界面抗剪承载力的公式。测试结果验证了所提出的公式，并为添加到现有RC柱中的RC梁的设计提供了重要的指导。建立了预测梁柱界面抗剪承载力的公式。测试结果验证了所提出的公式，并为添加到现有RC柱中的RC梁的设计提供了重要的指导。建立了预测梁柱界面抗剪承载力的公式。测试结果验证了所提出的公式，并为添加到现有RC柱中的RC梁的设计提供了重要的指导。