利用三维非线性有限元程序进行计算分析,研究了拱坝结构的稳定性和分叉准则,从平衡的唯一性出发,推导了失稳状态的分叉模式,给出了结构切线刚度正定性与分叉的关系;从能量的角度出发,探讨了结构失稳的判据;根据弹塑性有限元数值计算的成果,提出了拱坝基于屈服区连通的稳定判断方法;利用对锦屏拱坝的超载分析,寻求拱坝的破坏屈服面,从而推求并模拟坝体的破坏全过程。 The three-dimensional nonlinear finite element program is used to calculate and analyze the stability and bifurcation criterion of arch dam structure. Based on the uniqueness of equilibrium, the bifurcation mode of instability state is deduced. The positive definiteness of structural tangent stiffness and Based on the results of elastoplastic finite element numerical calculation, the stability judgment method of arch dam based on the yield zone connectivity is proposed. By using the numerical simulation results of Jinping arch dam Overloading analysis, to find the damage yield surface of the arch dam, in order to deduce and simulate the entire process of dam damage.