中文摘要：

为了解节点对结构抗连续倒塌能力的影响，使用按照我国规范设计的RC框架结构对该问题进行了研究。对比了考虑节点影响和不考虑节点影响两种情况下的分析结果，发现节点对结构抗连续倒塌能力影响不能忽略，考虑节点影响后位移反应增大，结构抗连续倒塌的承载力会明显降低。该文同时对锚固在节点区的梁柱钢筋直径和强度、节点区剪切变形、节点区混凝土抗压强度等指标进行了参数分析，分析结果表明锚固在节点区的梁柱钢筋直径和强度对结构抗连续倒塌能力影响显著，而节点区剪切变形和混凝土抗压强度对结构抗倒塌能力基本无影响。此外，研究了考虑节点影响时结构构件的破坏模式，分析结果表明按我国规范设计的RC框架结构在连续倒塌过程中构件仍以弯曲破坏为主，并没有发现构件出现剪切破坏。研究结论为RC框架结构抗连续倒塌设计和加固提供了参考依据。

英文摘要：

The influence of structural joints on the progressive collapse-resisting capability of reinforced concrete （RC） frames is studied by employing the structure designed in accordance with Chinese building codes. The comparison of the two numerical models with and without joints indicates that the influences of the joint have a significant effect of increasing the structural displacement responses while decreasing the structural progressive collapse-resisting capability on the progressive collapse-resisting performance of the structure. It is confirmed through the parametric analyses that the diameter and strength of the steel bars have great influences while the joint shear deformation and the concrete compressive strength in joint region have little influence on the progressive collapse-resisting capability of the structure. In addition, the analysis of failure modes of members considering the influence of joints shown that the flexural failure mode remains a dominant failure mode of the members, and no members appear shear failure. The conclusions can be used as references for the progressive collapse-resisting design and strengthening of RC frames.