关键词: 辐射阻尼, 有限元—无限元, 无质量地基, 拱坝, 抗震分析

Abstract: Based on the concrete damage plasticity model in ABAQUS，a finite element-infinite element coupling model considering the radiation damping of the foundation and a massless foundation model were established. The stress, the transverse joint opening, the displacements of the crest along the stream direction and the damage cracking condition of the high arch dam under design ground motion were discussed. The results show that, compared with the infinite element boundary model, the maximum stress of massless model in arch and beam directions of the dam increases obviously, the transverse joint opening of the dam and the displacements of the crest along the stream direction are increased, and the damage cracking condition of the dam body are more serious. Because the infinite element boundary model can truly reflect the seismic response of the dam considering the radiation damping of the foundation, and the massless foundation model exaggerates the seismic response of the dam, so it is too conservative to use the massless foundation model to analyze the seismic response of the dam.

Key words: radiation damping, finite element-infinite element, massless foundation, arch dam, anti-seismic analysis