record global stiffness matrix

[yen]

Hi Frank,

Now I need to record the global stiffness matrix at every time step. Can you tell me which files need editing?

Thanks,
Yen

[fmk]

you need to pick which SOE you are going to be using. then go to the sourcee code in
OpenSees/SRS/system_of_eqn/linearSOE directory. there are a number of subdirectories. choose the one for the solver you are going to use.

if you download and build the code using CVS you can now add your own solver as a package w/o having to build the rest of the code. there is no doc yet on this as it will not be released officially till the next release due sometime before May 22.

[carlos]

Hi Frank,

I can imagine from your answer that you are preparing a new version for the Parallel Workshop.

1. Is this new feature of adding external solvers related with Parallel computing or is an indepentent one.?
2. Will you include also additional solvers or we must develop them?.
3. I'm specially would know if this improvement could be used to perform dynamic analysis on free structures, it means, rigid body modes.


I think that it is an interesting option to check complex models. In my opinion, actually one typical error is not to fix properly the model and then it is quite difficult to check the script to see what it is lack.

Regards,

[msa_imeg]

[quote="yen"]Hi Frank,

Now I need to record the global stiffness matrix at every time step. Can you tell me which files need editing?

Thanks,
Yen[/quote]

I do this , I edit FullGenEigenSOE , FE_Element , DOF_Group Classes

I can upload My file if you want !

[sjerez]

[quote="msa_imeg"]

I do this , I edit FullGenEigenSOE , FE_Element , DOF_Group Classes

I can upload My file if you want ![/quote]

Hello!

I need to get the global stiffness matrix but actually I don't manage quite well the source code. I'm looking into BandSPD to get the A matrix but I would like to see your edited file if possible.
Thanks

[Derya Deniz]

Hello,
Can somebody please post examples about how to modify the files mentioned above in order to record global stiffness for each time, for any solver? I have checked the files as described above, trying for a long time, but couldn't make it. I really need this. Please, someone help me. Thanks.

[sightseeaud]

Could everyone share the code?

Cheers!

[ilhokan]

Can someone upload the code required for recording the global stiffness matrix of the model? Now, I am trying to match the SAP2000 Model and OpenSees Model and I got into trouble for obtaining global stiffness matrix for OpenSees Model.

[reagan]

Hi Frank

Just wanted to check if there are any updates to this thread. By any chance has functionality been added to OpenSees to view the Mass / Stiffness matrices?

My model's producing some complex eigenvalues and I'd like to see what's going on by looking at the matrices.

Thanks

Reagan

[fmk]

new command to print the contents of the A matrix (printA) that only will work with a full matrix, i.e. system FullGeneral

http://opensees.berkeley.edu/wiki/index ... tA_Command

[radmard]

PrintA does not work after analyze command in a static analysis. ( system FullGeneral is used).
No file be created.
Any suggestions or same experience?

[fmk]

are you using the latest version? try this:

wipe
model Basic -ndm 2
node 1 0. 0.
node 2 0. 1.
fix 2 1 1 1
geomTransf Linear 1
element elasticBeamColumn 1 1 2 100 100 100 1
integrator LoadControl 1.0
system FullGeneral
analysis Static
analyze 1
printA -file tmp.out