Abstract:Two local artificial boundary conditions—viscous artificial boundary condition and viscous-spring artificial boundary condition,are widely used for soil-structure dynamic interaction analysis in time domain finite element method for their good feasibility,fine precision and high numerical stability features. However, two local artificial boundary conditions mentioned above are derived in elastic media,so they are ordinarily used in elastic media. However,it is not verified either theoretically or practically that whether they can be transplanted to elastic-plastic media without any change;or if can,how much error will be induced compared with true condition. Based on the conclusion made by other scholars that the error induced by transplanting viscous artificial boundary condition and viscous-spring artificial boundary condition derived in elastic media to viscoelastic media without any change will not be large,and on the conclusions that elastic-plastic media can be treated as nonlinear equivalent viscoelastic media under some conditions,the verification and error analysis are performed with theoretical analysis and numerical examination. Analytical results show that if the plastic region of media is limited to some extent,the error induced by transplanting viscous artificial boundary condition and viscous-spring artificial boundary condition derived in elastic media to elastic-plastic media without any change will not be great,and they can be accepted within engineering precision.