本文应用非线性有限元法分析了钢筋混凝土框架顶层中节点的非线性性能。弹塑性本构关系是建立在Ｄａｒｗｉｎ的模型和Ｃｏｌｌｉｎｓ的斜压场理论基础上，并考虑了混凝土等效单轴受拉软化、受压软化、及钢筋和混凝土之间的粘结滑移，据此编制了非线性分析程序。对顶层中节点在单调荷载作用下裂缝的发展、受力性能及变形特征进行了分析，并和试验结果进行了比较。 In this paper, the nonlinear finite element method is used to analyze the nonlinear behavior of the joints in the top layer of reinforced concrete frames. The elasto-plastic constitutive relation is based on Darwin’s model and Collins’ oblique pressure field theory, and considers the equivalent uniaxial tension softening of concrete, softening under pressure, and the bond slip between steel and concrete, according to This compiled a nonlinear analysis program. The development of the cracks under the monotonic loading, the stress properties and the deformation characteristics of the nodes in the top layer were analyzed and compared with the experimental results.