拱坝地震输入模型中黏弹性边界与黏性边界的比较

本文首先介绍了动力分析中无限地基数值模拟采用的各种方法，包括无穷元方法、边界元方法、无穷边界元方法。无限边界处理有叠加边界、黏性边界、黏弹性边界和人工透射边界。介绍了拱坝地震自由场输入模型。通过算例和实际工程计算，验证了黏性边界和黏弹性边界均有较好的吸能效果，且两种边界条件下，所得计算结果几乎一致。黏性边界或黏弹性边界均可作为拱坝地震自由场输入模型中的吸能边界。

Comparison of spring-viscous boundary with viscous boundary for arch dam seismic input model

The difference of spring-viscous boundary and viscous boundary for arch dam seimic input model with free field is analyzed theoretically. The calculated dynamic responses of a vertical stick based on these two different boundary conditions are compared with the theoretical solution. The comparison shows that the calculation errors of both boundary conditions relative to the precise theoretical solution are approximately the same. It is concluded that both boundary conditions are suitable in calculations of arch dam seimic input model.