spring model

[Muntasir]

Hi,
I want to model a column with SMA and steel as reinforcement. In order to implement the bond slip relation i want to introduce a rotational spring. I have the moment curvature relationship of that spring. Can any one suggest me how I can model that spring.

Thanks

[ricardomonteiro]

Hi Muntasir,
Have you tried to use a link element, choosing trl_sym or trl_asym for curve type, defining, therefore, a tri-linear approximation of your moment-curvature relationship?
Regards,
Ricardo