Displacement Control in OpenSees

jwaugh · Post by **jwaugh** » Tue Apr 05, 2005 8:03 am

If I am running an analysis under displacement control how do I specify that for a given time step I want the structure to displace in a direction which has the components of 1.0Y and 0.3X. If the section isn't symmetric you cannot just put your load in that direction. Thanks for all the help.

Post by **fmk** » Tue Apr 05, 2005 10:22 am

you can't .. under displacement control you can only do 1 dof .. if you know
the displacements for all free dof you can use imposed displaements.

jwaugh · Post by **jwaugh** » Tue Apr 05, 2005 1:57 pm

Okay, how do I impose the displacements if I know what they should be for all the degrees of freedom? I didn't know I could do that.

Post by **fmk** » Wed Apr 06, 2005 10:25 am

treat it like a multi-support excitation .. inside a multi-support pattern create a ground motion
for each displacement you want to control & then create an imposedMotion for each dof ..
have a look at the multi-support pattern in the manual.