Stiffness matrix

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pavlos
Posts: 8
Joined: Wed Feb 06, 2019 2:09 am
Location: DTU

Stiffness matrix

Post by pavlos » Thu Apr 04, 2019 12:09 pm

Hello, Does anybody know whether it is possible in OpenSees to extract the stiffness matrix of the structure after every timestep in the time history analysis?
Thank you

dgale
Posts: 55
Joined: Fri Jan 15, 2016 4:01 am
Location: UPM

Re: Stiffness matrix

Post by dgale » Wed May 08, 2019 9:20 am

Yes, it is
You must use system FullGeneral and after your analysis, you must add the following:

set controlTime [getTime];
set ok [analyze 1 $dtcal]; <----------Your analysis
set Kfile [join [concat "K" "$controlTime" ".out"] "" ]
printA -file $Kfile;

pavlos
Posts: 8
Joined: Wed Feb 06, 2019 2:09 am
Location: DTU

Re: Stiffness matrix

Post by pavlos » Wed May 08, 2019 11:18 pm

ok thank you very much

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