摘要
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 stability evaluation and bifurcation criteria are presented for the Jinping Arch Dam structure. The bifurcation modes in failure status of the arch dam are derived from the uniqueness of the governing equation of dam behaviors and the related phenomena are given in the paper between positive definiteness of dam structural tangent stiffness and bifurcation. Then the structural collapse criteria for arch dam are discussed in the energy mode. A stability criterion of dam based on the connection of yield region is proposed according to the implementation of elasto-plastic FEM (finite element method) numerical calculations. In accordance with this judging method, nonlinear analysis of FEM is used for Jinping arch dam analysis. The yielding domains of the Jinping dam were sought and its failure process was simulated with the overloading numerical analysis.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2002年第A02期2403-2407,共5页
Chinese Journal of Rock Mechanics and Engineering
关键词
水工结构
稳定评估
破坏仿真
分叉准则
锦屏拱坝
hydraulic structure
stability evaluation
failure simulation
bifurcation criteria
Jinping Arch Dam
