Maybe it's a strange behaviour but it's easier a silly question:
I modeled a jacketed line, I have the jacket at 145 C and the core at 210, same material.
I model the line using anchor restraints in cnode at flanged connections.
With my surprise the axial load due to this restraint doesn't change if I change line lenght. I expected an increase of the axial load with lenght.
Am I wrong?

Hi Ferex

Yes you are getting the right result in this case.
Axial load= stress*area
Stress=Strain*Modulus of elasticity
Strain=Change of length due to thermal expansion per unit length (Delta L / L) is constant.

So you should get same axial force.
If you check load with two anchor point in a straight line you will get similar result.
Here note one point that caesar do not take care of buckling.

Regards

Habib