asdeasoft.net

Good morning STKO team.
I am modeling a soil column with SSPQuadUP elements, following the examples in the OpenSees wiki.
The objective is to perform an effective site response study.
I have incorporated everything that the examples indicate, but the model does not start calculating the accelerations and this error appears.
Could you check what needs to be corrected for the model to run?

Can you please check the model?

There is an error in the viscous material: the exponent 0, makes the residual from for the damping force always = 1, whatever velocity is there.

Make it 1 for linear damping. In this way the first analysis runs fine, but then the second one takes forever, probably due to some internal iterations not solved by the PDMY material (in this case double check material parameters)