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so then do you think if I write a code to do eigenvalue analysis for the initial stiffness matrix and the subtracted stiffness matrix (=geometric stiffness matrix), that would give me the buckling load of the system?
Thank you

Thanks Frank. Yes, that's what I did. But as a back of an envelope, I was hoping to see opensees has this solver added to the source code!

Dear Frank, Thanks for your reply. Let me take the problem one step higher, I would like to grab the initial stiffness matrix and then apply a set of load and get the new stiffness matrix. Then subtract the first one from the second to get geometric stiffness matrix. Do you think that's a possibilit...

Hi everyone,
Does opensees have the option of buckling analysis?

Hi everyone,
I would like to extract (output) tangent stiffness matrix in a static analysis? Can anyone help please?
Thanks