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Hello,

I am working on creating a simple single-degree-of-freedom (SDOF) model using two zero-length elements to represent stiffness and damping. For this, I used the Steel01 material type for stiffness and the Viscous material type for damping.

Upon running the model, I didn't encounter any convergence issues. However, when I recorded the forces and deformations in the two zero-length elements, I observed unexpected behaviors:


I am not able to understand these results. Shouldn't the first element display the behavior characteristic of the Steel01 material and the second element exhibit the typical response of a viscous damper?
Thank you for the support!


Best regards,
Mazen

Check material.stress vs material.strain in the post processor using the gauss plot. In this case you can see each material response.
Not that I had to increase the ground motion a lot to see these results:
stiffness: damping: