EqualDOF command

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This command is used to construct a multi-point constraint between nodes.

equalDOF $rNodeTag $cNodeTag $dof1 $dof2 ...

$rNodeTag integer tag identifying the retained node (rNode)
$cNodeTag integer tag identifying the constrained node (cNode)
$dof1 $dof2 ... nodal degrees-of-freedom that are constrained at the cNode to be the same as those at the rNode
Valid range is from 1 through ndf, the number of nodal degrees-of-freedom.


equalDOF 2 3 1 3 5;

  1. impose the displacements at dof's 1,3 and 5 of node 3 to be the same as those of node 2.


Cook, R.D., Malkus, D.S., Plesha, M. E., and Witt, R. J., "Concepts and Applications of Finite Element Analysis," 4th edition, John Wiley and Sons publishers, 2002.

Code Developed by: fmk