钢筋混凝土柱-钢梁 (RCS) 组合结构因性能优异被超高层建筑广泛应用, 本文对带钢箍构造的“梁贯通”式和“柱贯通”式RCS混合节点进行数值仿真分析, 重点考察了翼缘宽厚比、钢材屈服强度、轴压比、混凝土强度及端板厚度5个不同参数对RCS混合节点抗震性能及破坏模式的影响。研究结果表明: 通过合理的参数设置, ABAQUS有限元模型能够模拟出RCS混合在静力荷载作用下的性能, 与试验结果吻合较好; 在“强柱弱梁”的机制下, 组合节点首先发生梁铰破坏, 节点的轴压比变化和混凝土强度参数变化对节点极限承载力和变形性能影响不大; 增大翼缘宽厚比, 节点承载力最大减少11%, 提高钢材的屈服强度, 节点承载力最大增加36. 4%; 提高柱贯通试件的端板厚度, 节点的承载能力以及变形性能得到了一定改善; 各参数的变化对节点最终的钢梁塑性铰破坏模式无明显影响。本文的研究为今后该类节点的设计和研究提供了理论支撑。

Reinforced concrete column-steel beam (RCS) composite structures are widely used in super highrise buildings due to their excellent performance. In this paper, the numerical simulation analysis of the RCS hybrid joints of “beam through” and “column through” RCS constructed with steel hoop structure are carried out, and the influence of five different parameters, i. e. , flange width-thickness ratio, steel yield strength, axial compression ratio, concrete strength and end plate thickness, on the seismic performance and failure mode of RCS hybrid joints is investigated. The results show that the ABAQUS finite element model can simulate the performance of RCS mixing under static load through reasonable parameter settings, which is in good agreement with the experimental results. Under the mechanism of “strong column and weak beam”, the combined node firstly undergoes beam-hinge damage, and the change of the axial compression ratio and the concrete strength parameter of the joint have little effect on the ultimate bearing capacity and deformation performance of the joint. Increasing the flange width-thickness ratio reduces the bearing capacity of the joint by up to 11%, and increases the yield strength of the steel, and increases the bearing capacity of the joint by 36. 4%. The thickness of the end plate of the column through specimen is increased, and the bearing capacity and deformation performance of the joint are improved to a certain extent. The changes of each parameter have no significant effect on the final plastic hinge failure mode of the joint. The research in this paper provides theoretical support for the design and research of this type of node in the future.