Dynamic analysis using time varying force

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subrata
Posts: 13
Joined: Fri Nov 28, 2008 11:12 pm

Dynamic analysis using time varying force

Post by subrata »

Hi,
Can anybody tell me how to do dynamic analysis in Opensees by applying multisupport excitation in terms of force (not acceleration, vel or dis).

Thanks in advabce,
Subrata
Last edited by subrata on Mon Dec 01, 2008 5:02 am, edited 1 time in total.
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silvia
Posts: 3909
Joined: Tue Jan 11, 2005 7:44 am
Location: Degenkolb Engineers
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Post by silvia »

you can't with the current opensees.
Silvia Mazzoni, PhD
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104
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subrata
Posts: 13
Joined: Fri Nov 28, 2008 11:12 pm

Simplified model

Post by subrata »

Thanks Silvia.
Let me simplify the model.
I have a simple 2DOF system and I want to dyamic analysis of this system by applying two different cyclic force along two DOF. What are the commnads in OpenSees for such simple solution?


Thanks in advance.
Regards,
Subrata
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Rehlinger25
Posts: 1
Joined: Wed Oct 10, 2007 1:00 am
Location: Houston, TX

Post by Rehlinger25 »

Hi,

Has there been any response to this last post? Can you apply a time varying force in opensees? I'm looking to do basically the same thing-any chance of this happening?
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fmk
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Post by fmk »

you just define the loads as nodal loads within a load pattern (multiple load patterns if the load varies differently at each dof) .. the loads are just reference loads and the time series for the pattern defines the variation .. use either Path or Trig for the TimeSeries .. instead of doing a static analysis just do a dynamic analysis.
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