基于多边形比例边界有限元的重力坝地震断裂模拟

针对地震条件下重力坝中裂纹的稳定性,基于多边形比例边界有限元法(Polygon SBFEM)提出了一种重力坝地震开裂过程模拟的数值模型。该模型中SBFEM兼具边界元和有限元两种方法的优点,而多边形比例边界单元和局部网格重剖分技术的引入使得对裂纹扩展过程的模拟更加灵活、便捷。对Koyna大坝的地震断裂过程模拟结果与试验及文献的分析结果一致,说明该方法为混凝土坝地震断裂数值分析提供了新途径。

Seismic Fracture Simulation of Gravity Dam Based on Polygon Scaled Boundary Finite Elements

For the crack stability of gravity dam under condition of earthquake, based on the polygon scaled boundary finite element method ( Polygon SBFEM ), a numerical model for seismic crack propagation in gravity dam is developed. SBFEM has the advantages of both BEM and FEM. Meanwhile the introduction of the Polygon SBFEM and local remeshing technique makes modeling of crack propagation more flexible and convenient. The simulation results of the seismic fracture process of the Koyna dam demonstrates a good agreement with test and other numerical simulation reported in the literature. Thus, it shows that the proposed model provides a new approach for numerical simulation of seismic fracture in concrete dam.