Dear All,

How can I model a guide support which moves laterally with the structure in CaesarII ? I have the amount of structure displacement

Thank you

Is there a gap on this guide?
If not, replace your restraint for this guide with a displacement set. Enter displacements only for the direction(s) where the structure/guide assembly imposes these displacements. You might want to use a distinct displacement group if you wish to segregate this displacement from others. For example, if this structure motion is caused by wind instead of thermal growth and you have other thermal growth to model, use D1 (to go with T1) for the thermal movement and assign your structure displacements to, say, D4; you can then build that wind case as WIN1+D4.
If there is a gap, model the guide as a restraint with a gap and specify a connecting node (CNode) for that restraint. Specify displacements like above but assign these displacements to that same CNode.
Review the results to confirm your model is correct.

Thanks a lot. I don't have any gap but if I want to consider friction coefficient should I specify Cnodes again?

And also, how can I model a rest support which moves laterally but not as much as the pipe. for example the the structure which the shoe is on moves 10" (+Z) but the pipe moves 15"(+Z) due to the movement of another platform. When there is a friction coefficient it affects the results. doesn't it?

Thank you

Yes, another twist...
Just setting the displacement for an ungapped guide will not allow you to consider friction coming from the guide. You are on the right track though. Use the Node/CNode restraint definition and then set your coefficient of friction on that restraint (and displacement on the CNode).

If you set this up properly you should be able to confirm support action when both the pipe & support are moving differing amounts. Once again, close review of results can confirm your model.

(I tend to discount friction on supports not carrying weight. Weight bearing restraints have a more consistent normal load so more consistent friction. With your gapped guide, there will be some free sliding before the pipe engages the pipe and friction actually begins on this lateral restraint.)

Thank you David. It worked