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Good morning, everyone.

I am trying to develop the Haselton reinforced concrete model ID1010. I am attempting to incorporate soil-structure interaction by using a zero-length spring at the base of the column. However, when I include it, the model becomes unstable or fails. I am unable to identify the issue.

I would greatly appreciate any help or suggestions.

Thank you!

Your MK models do not offer any residual strength after the theta_u, so it will drop to zero.
In this picture I increased the ultimate ratio to 0.1 to show the drop.
However, since you are using a small ratio (0.01), you can also use a large theta_u, in this way you will have a very small residual strength

Thanks for your contribution.

You're welcome