The Study Of Multi-sources Scattering Viscous-spring Artificial Boundary

The viscous-spring artificial boundary is proposed in recent years, which is realized easily by utilizing the Spring-damper cell in finite element software of ANSYS. The combination method of the finite element method and the viscous-spring boundary is used effectively in dynamic soil-structure interaction because it's simply ,high accuracy and convenient actualization in current commercial software in recent years. The method is applied in the situation of single scattering source.But in the long-outspread structure of multiple-span bridge and railway roadbed, the distance between of bridge foundations and sleepers may be far ,which are called multi-points scattering problem. The error would be caused if the viscous-spring artificial boundary of single scattering source is used in above situations. Meanwhile, the artificial accuracy is an important criterion which evaluate its application in engineering.On the basis of prevenient viscous-spring artificial boundary, the viscous-spring artificial boundary of multi-points scattering source is proposed, which is suitable for the input of multi-points scattering and seismic wave. The numerical calculate is carried by simulating the viscous-spring artificial boundary with the Spring-damper cell in ANSYS. The results indicate the proposed method in the paper can improve the accuracy of viscous-spring artificial boundary compared with the situation of single scattering source.