The OpenSees Community

Thanks for the reply, Frank. I'll talk to Dimitrios about this problem (again). Thanks for the lead with Reagan -- I'll be sure to contact him.

I have noticed problems with the "ModIMKPeakOriented" and "ModIMKPinching" materials where springs with these materials can fail to take appropriate loads. This problem is illustrated in the following SDOF model, which has an elastic column with a rotational spring at the base. W...

burnningcat -- Are you still having problems when you use version 2.2.2.g of OpenSees? If so, what are you plotting when you say that there is no unloading? The moment vs. rotation of a certain zeroLengthElement?