EqualDOF Constraints

This command is used to construct a multi-point constraint between nodes where the degrees-of-freedom at the constrained node move exactly the same as the degrees-of-freedom at the other node, the retained node.

equalDOF $rNodeTag $cNodeTag $dof1 $dof2 ..


retained (primary) node

constrained (secondary) node

valid range of $dof is 1 through ndf of the constrained node

if no dofs are specified, all dofs of the constrained node are used


The following command will impose the displacenents at dof’s 1, 3, and 5 at node 2 to be the same as those of node **33*.

  1. Tcl Code

equalDOF 2 33 1 3 5;
  1. Python Code



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