Through assuming reasonable constitutive relation of materials, finite element analysis (FEA) models of joints consisting of prestressed concrete-encased steel beams and concrete-encased concrete filled steel tube (CFST) columns were established by soft ABAQUS, and the simulated results were compared with tested ones. On this basis, the nonlinear analysis on the total loading process was conducted, and the stress variation of concrete, profile steel skeleton, steel bar skeleton, and prestressing tendons were observed at yield, peak, and ultimate loads; the influence of axial compressive ratio, steel tube ratio, stirrup ratio, and prestressing level on lateral load-displacement curves at column top and shear force-shear angle in joint core were investigated, and the shear capacity formulae of joint core were developed. It could be concluded that, the lateral peak loads and shear capacity could be improved with the increase of axial compressive ratio, steel tube ratio, stirrup ratio, and prestressing levels in varying degrees, and the ductility of joints will reduce with the increase of axial compressive ratio. Additionally, the shear capacity calculated by proposed practical formula was a little lower than FEA results, which could keep the joints safety and could be used in engineering design.

通过假定合理的材料本构关系，通过软ABAQUS建立了预应力混凝土梁和钢管混凝土柱的节点的有限元分析模型，并与模拟结果进行了比较。经过测试的。在此基础上，对总荷载过程进行了非线性分析，并在屈服，峰值和极限荷载下观察了混凝土，型钢骨架，钢筋骨架和预应力筋的应力变化。研究了轴压比，钢管比，箍筋比和预应力水平对接缝芯柱顶侧向位移曲线和剪力-剪角的影响，建立了剪缝芯的抗剪承载力公式。可以得出结论，随着轴向压缩比，钢管比，箍筋比和预应力水平的增加，侧向峰值载荷和抗剪承载力可以得到不同程度的提高，节点的延性将随着轴向压缩比的增加而降低。另外，所提出的实用公式计算的抗剪承载力比有限元分析结果略低，可以保持节点的安全性，可用于工程设计。