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在土-结构动力相互作用分析中,黏性人工边界条件和黏弹性人工边界条件虽具有计算效率和精度较高的优点,但施加边界单元的工作量较大;远置边界虽然具有处理技术简单、精度高等优点,但又存在计算成本高的问题。为克服黏性人工边界和黏弹性人工边界施加边界黏弹性单元工作量大、远置边界计算成本高的缺点,基于波的传播理论和波在介质交界面上的反射、透射原理,通过设置完全透射层并大大降低波在透射层的传播速度的方法,提出了一种等效远置动力人工边界条件并对其进行数值验证分析。研究结果表明,所提出的等效远置动力人工边界条件仅需通过合理选取透射层的参数,即可实现反射波向无限地基传播的模拟,具有精度和效率较好、不需施加边界单元工作量等优点,可应用到土-结构动力相互作用分析当中。
In the soil-structure dynamic interaction analysis, viscous artificial boundary conditions and viscoelastic artificial boundary conditions have the advantages of high computational efficiency and accuracy, but the workload of applying boundary elements is larger. Although the remote boundary has the advantages of simple processing technology , High accuracy, but there is the problem of high computational costs. To overcome the sticky artificial boundary and the viscoelastic artificial boundary, the boundary viscoelasticity unit has a large workload and the computational cost of the far boundary is high. Based on the wave propagation theory and the reflection and transmission principle of the wave at the medium interface, Transmissive layer and greatly reduce the wave propagation velocity in the transmission layer, an equivalent far-off dynamic artificial boundary conditions are proposed and its numerical verification analysis. The results show that the proposed equivalent far-away dynamic artificial boundary conditions can be used to simulate the propagation of the reflected waves to the infinite foundation only by reasonably selecting the parameters of the transmission layer. The proposed method has the advantages of accuracy and efficiency without the need of applying boundary elements Quantity and other advantages, which can be applied to the soil-structure dynamic interaction analysis.