multiple constraints

[mfa]

Hi,
I would need, for a particular modelling, to update the constraints (fixity) of a certain node after application of the gravity load (before pushover analysis). I am wondering If anyone knows if there is any command in tcl or technique to do such a thing.

Thank you in advance,

Mohammad

[fmk]

you can add or remove conatrsints at any time using the fix, equalDOF and remove commands .. always remove a constraint before changing it, for if you add constraints on top of an existing one the results is going to be undefined as i cannot gaurentee which one will be processed last (this has to do with how they are stored in the domain and how they are iterated through) and i cannot again gaurentee which will be removed for same reason if the remove command is issued after the fact.