remove nodes's constraint

[bmobashe]

Hi ,
I have a question about Fix command. I have some nodes in my model that I need to set them fix for gravity analysis and then in the same tcl file set the same nodes free for dynamic analysis for some Dofs. I wonder if there is any command that I can use to remove their constraint.
for example:
first in gravity analysis :
fix 1 1 1 o
fix 2 1 1 o
and then in dynamic analysis I want to set them free

fix 1 o o o
fix 2 o o o
I did this but when I saw the results it did not work and nodes 1 and 2 still fix in x and y.
I really appreciate if you could help me with that

Thanks,
Bahareh

[vesna]

You can remove constraints using "remove sp" command given bellow:
remove sp $nodeTag $dof