How to output global matrix: M, C, K, Q?

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XiaoxuD
Posts: 8
Joined: Wed Feb 15, 2017 1:22 am
Location: csu

How to output global matrix: M, C, K, Q?

Post by XiaoxuD » Thu Sep 21, 2017 12:06 am

Is it possible to output a model's global matrix (M, C, K, Q) with Tcl at a certain time step during a transient analysis?
How to do it?
Should I change the OpenSees code?
Thank you.

epsilon
Posts: 9
Joined: Sat Aug 26, 2017 5:44 am
Location: NA

Re: How to output global matrix: M, C, K, Q?

Post by epsilon » Thu Sep 21, 2017 9:15 pm

i was able to export global stiffness matrix of whole model with printA command (look at http://opensees.berkeley.edu/wiki/index ... tA_Command)

selimgunay
Posts: 913
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: How to output global matrix: M, C, K, Q?

Post by selimgunay » Fri Sep 22, 2017 12:13 pm

Please see the topic for M

http://opensees.berkeley.edu/community/ ... =2&t=64191

Once you have M and K, you can compute C from Rayleigh damping if you are using damping for all the structural elements

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