printA fatal issue

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assimi
Posts: 17
Joined: Wed Mar 30, 2016 11:16 am
Location: University of Adelaide

printA fatal issue

Post by assimi » Mon Nov 02, 2020 8:24 pm

Hi

I would like to report a problem that I am not sure if it is a bug. I would like to obtain the stiffness matrix of a truss in openseespy. I use printA and FullGeneral system after ops.analysis. However, if the truss is unstable, it returns this error and quit the python console. It works properly if truss is stable. Returned error is:
FATAL FullGenLinSOE::getX - vectX == 0
Would you please help me out how to achieve a stiffness matrix for a non-internal stable truss?

mhscott
Posts: 569
Joined: Tue Jul 06, 2004 3:38 pm
Location: Corvallis, Oregon USA
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Re: printA fatal issue

Post by mhscott » Tue Nov 03, 2020 5:16 am

The analysis will not run properly if the truss is unstable. This is expected.

assimi
Posts: 17
Joined: Wed Mar 30, 2016 11:16 am
Location: University of Adelaide

Re: printA fatal issue

Post by assimi » Tue Nov 03, 2020 5:52 pm

Thanks for your reply. I guess in the current state, OpenSees can not return the stiffness matrix before performing analysis. As a suggestion, it would be great to achieve the stiffness matrix before analysis. I am not sure if it is possible.

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