cyclic analysis of infill masonry wall

[giom]

Good morning everyone!

I modelled a speciment of infill masonry wall in STKO. On this I want to apply a cyclic analysis (with only one cycle actually). So, I built the model with a specific interaction that can simulate the applied load (you can see this in attached .sdc file). Regarding the material, I used DamageTC3D for masonry and ASDConcrete3D for the frame.
The problem is that the analysis stops before its completion (you can see the plot curve and analysis text in the attached files). What is the reason for this error?

Another problem I want to understand is why the curve does not follow the experimental curve (dashed line) in negative displacement. The cause is the use of DamageTC3D? I tried to use only ASDConcrete3D but it provides serious convergence problems.

Thank you very much for your answer!

Giovanni

[STKO Team]

The convergence error is fine, it can happen that you don't converge and then the adaptive time step will try to reduce the time step.
The issue that you have here is the error raised by the force-beam column that for some reason messed up the parallel communication.
Try with disp-beam-column elements for the rebars. Their mesh is quite dense so you don't really need the force-based element.

Regarding your cyclic analysis:
It makes sense that after pushing in X, damaging the structure to almost 200 kN, the unloading branch will point to a lower value in the backbone curve