Forum for OpenSees users to post questions, comments, etc. on the use of the OpenSees interpreter, OpenSees.exe
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jwaugh
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- Location: HNTB - Portland ME
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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.
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fmk
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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.
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jwaugh
- Posts: 110
- Joined: Thu Jul 15, 2004 12:20 pm
- Location: HNTB - Portland ME
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.
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fmk
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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.