Softening Behavior in Drucker Prager Concrete Model
I am trying to model "push" of a layered masonry wall. After meddling with SOLID65 for a long time, I moved to SOLID185. With DP Concrete model, I have gained results that match closely with the experimental results (I am satisfied!). I have been trying to get displacement vs. Base Shear during the push, and have succeeded in doing so. I believe that DP Concrete does a good job on that regard.
However, I now want to incorporate softening behavior into the model (I am trying to use linear HSD model: HSD6). The base shear should go down after about 75 mm. However, after using the softening parameters, the solution doesn't go beyond the linear limit. Here's what I got:
I will be happy to get just the cutoff point (the ultimate displacement). Maybe, someone can point on what I am doing wrong, and point me in the right direction. As always, your help is highly appreciated.
Thanks in advance.
P.S: I have attached the input file for Mechanical APDL.