3.1.3.1. fix Command

This command is used to construct a number of single-point homogeneous boundary constraints.

fix $nodeTag (ndf $constrValues)

Argument	Type	Description
$nodeTag	integer	unique tag identifying the node to be constrained
$constrValues	list integer	ndf constraint values (0 or 1) corresponding to the ndf degrees-of-freedom. 0 unconstrained (or free) 1 constrained (or fixed)

Example:

The following examples demonstrate the commands in a script to add homogeneous boundary conditions

to nodes 1 and 2 for a model with ndf of 6. Node 1 is specified to be totally fixed, node 2 is only constrained in the second and fifth degree-of-freedom.

1. Tcl Code

fix 1 1 1 1 1 1 1
fix 2 0 1 0 0 1 0

1. Python Code

fix(1,1,1,1,1,1,1)
fix(2,0,1,0,0,1,0)

Code developed by: fmk