I can not find how to build a modeling of bilinear spring, specially for rotation.
It means that moment and curvature, moment-curvature curve, should be considered.
There is no example.
Anyone could explain me how to make a bilinear spring?
If there is example then it is better.
In RM Bridge you can create a table in Analyzer/Properties/Variables.
Then modify the Spring at Structure/Elements/ElementsType to one of the several non-linear possibilities.
You can select a stress strain diagram as shown below.
Apply the Variable name to the rotation in the Specific Values for each DOF- Degree Of Freedom.
More advanced options are also available.
Also check the video RM Bridge bilinear springs with hysteretic behavior below: