在日益成熟的社会化建设中，随着人们生活、工作及物质需求的不断变化和提升，既有建筑物的改造及加固任务愈来愈大，其中不少涉及新增梁柱节点问题，而梁柱节点又是框架结构中的重要部位，因此，深入研究加固改造新增梁柱节点的连接方法及其受力性能，尤其新增梁柱节点的抗震性能具有重要的理论研究意义和工程应用价值。 本文首先从理论方面对新旧混凝土结构的工作特点、受力机理及植筋系统的锚固性能分析，得出影响加固改造新增梁柱节点抗震性能的影响因素。此后，采用数值模拟方法，建立了4个系列9个模型。通过低周反复荷载作用下的模拟计算，讨论了植筋位置、植筋长度、植筋直径等因素对新增混凝土梁柱节点抗震性能的影响，并通过工程实例验证了植筋方法增设节点的可靠性。主要得出以下几点结论：（1）附加植筋锚固长度为15d时，梁柱节点钢筋都发生了程度不等的滑移，主要原因为锚固力不足，当植筋锚固长度增加到18d时，可减小或避免钢筋滑移，提高梁柱节点的抗震性能和极限承载力；（2）增大植筋直径可提高梁柱节点承载力，也可减小滑移，提高抗剪承载力，但是随着植筋直径的增大，其延性有所降低，且植筋直径越大刚度退化明显；（3）初步推导出加固改造新增混凝土梁柱节点的抗剪承载力公式。 上述研究结论可供进一步研究加固改造新增混凝土梁柱节点的受力性能研究及工程设计、施工参考。

In an increasingly sophisticated social construction, there are increasing projects of renovation and reinforcement of existing buildings as a result of changing of people’s life, job and material needs, many of which involve adding new concrete beam-column joints or retrofitting the existing concrete beam-column joints. Beam-column joints is an important part of the framework structure, therefore, it has important theoretical significance and engineering application value to syudy minutely the connection method of retrofitting beam-column joints and its mechanical properties, especially the seismic performance of new beam-column joints. Firstly, the working characteristics, loading mechanism and anchorage system performance analysis of the old and new concrete structures is studied from the theoretical aspects, the factors influencing the seismic performance of new retrofitting joints is acquired. Then, numerical simulation method is used, in which nine models of four series is established. The reliability of adding nodes by anchoraging methods is verified through numerical simulation and engineering examples. The influence of anchorage location, anchorage length, diameter of anchorage and other factors on seismic performence of new concrete beam-column joints is discussed, the following conclusions can be drawn: when the additional anchorage length is 15d, the beam-column joints bars have undergone varying degrees of slip. To improve the seismic performance of beam-column joints, the additional anchorage length increase to 18d, which effectivey reduces the slip phenomenon. The ultimate bearing capacity of nodes is improved, and the seismic performance of the retrofitting specimen is close to the the entire cast nodes. (2) Increasing the diameters of anchorage can improve the load capacity of beam-column joints, reduce slippage and improve the anti-shear capacity. But with the anchorage diameter increases, the ductility decreased. The larger the diameter of anchorage, the worse the stiffness of anchorage degradats. (3) The anti-shear capacity formula of retrofitting new concrete beam-column joints is preliminary obtained. The conclusion of this study can be a reference for further research on the mechanical property of retrofitting new concrete beam-column joints and engineering design and construction .