Nonlinear analysis in unreinforced masonry structure

[kgkoktsi]

How can I simulate the nonlinear behavior of an unreinforced masonry structure in a model of shell elements?
Is it adequate if I use the nDMaterial Drucker-Prager or should I use another material in order to take into account the constitutional law?
Is the "template Elasto-Plastic" material more proper?

[gerber]

Drucker Prager is the most suitable nDMaterial which you can find in Opensees for your problem.
However,I am not sure if you can use Drucker-Prager for a plain stress problem.
I think that there is a notation that Drucker-Prager (in Opensees) is suitable for Plain Strain problems....so you should use brick elements !