Skip to content

!SPRING

Definition of spring boundary conditions

This is a boundary condition that elastically supports a specified degree of freedom of a specified node against the ground. No element needs to be defined in the mesh data. To connect two nodes by a spring, use the connector element springs !SPRING_A / !SPRING_D, which serve a different purpose.

Parameter

GRPID = Group ID

** 2nd line or later **

(2nd line) NODE_ID, DOF_id, Value
Parameter Name Attributions Contents
NODE_ID I/C Node ID or node group name
DOF_id I Restricted degree of freedom
Value R Spring constant

Example of Use

!SPRING, GRPID=1
1, 1, 0.5

Note:

  • !SPRING can be used in static analysis and in implicit dynamic analysis.
  • GRPID is referred to from the LOAD line of !STEP in order to activate the spring support for each step.