who knows the reason of this error in opensees?
I have modelled a 12 story 2D model and cant get upper modes.
Could not build an Arnoldi factorization.IPARAM(5) the size of the current Arnoldi factorization: is 12factorization. The user is advised to check thatenough workspace and array storage has been allocated.
WARNING DirectIntegrationAnalysis::eigen() - EigenSOE failed in solve()
It must be the model. Check your connectivity first. Then, check equalDOFs, if you have any. Also, check masses. If you are using ndm -2 ndf -3 for model builder, mass should have 3 inputs (x, y, z) rather than 6. Also keep in mind that "the default eigensolver is able to solve only for N-1 eigenvalues, where N is the number of inertial DOFs. When running into this limitation the -fullGenLapack solver can be used instead of the default Arpack solver".
https://www.researchgate.net/topic/OpenSEES
https://www.nextfem.it/it/opensees/
You can follow these tutorial of 2D frame first, and get correct opensees script, then modify with yours.
https://www.youtube.com/watch?v=SJXmhwLE-i0