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This command is used to construct a four-node 3D viscous-spring boundary quad element object based on a bilinear isoparametric formulation.

{| 
| style="background:yellow; color:black; width:800px" | ''' element VS3D4 $eleTag $node1 $node2 $node3 $node4 $E $G $rho $R $alphaN $alphaT'''
|}

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{|
|  style="width:150px" | '''$eleTag''' || unique element object tag
|-
|'''$node1 ..$node3''' ||4 end nodes
|-
| '''$E''' || Young's Modulus of element material
|-
| '''$G''' || Shear Modulus of element material
|-
| '''$rho''' || Mass Density of element material
|-
| '''$R''' ||distance from the scattered wave source to the boundary
|-
| '''$alphaN''' || correction parameter in the normal direction
|-
| '''$alphaT''' || correction parameter in the tangential direction
|}



Reference:
Liu J, Du Y, Du X, et al. 3D viscous-spring artificial boundary in time domain. Earthquake Engineering and Engineering Vibration, 2006, 5(1):93-102

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Code Developed by: <span style="color:blue">  </span> Quan Gu, Yichao Gao and Zhijian Qiu