How to connect two OFFRFobjects to simulate bolted connection?

[qiushi-Lee]

As the topic, I want to build a nonlinear bolted relationship between two OFFRFobjects for their dynamic response, but I don't know which joint or connection could realize this purpose.

[jgerstmayr]

You can use a RigidBodySpringDamper. You attach markers to the ObjectFFRFreducedOrder, using MarkerSuperElementRigid attached to them.
In RigidBodySpringDamper, you can also use user-functions to define the nonlinear {force-torque} to {displacement-rotation} relations.