is it really required to specify strut stiffness in caesar?
meanwhile we are not using stiffness's to normal guide support.

Regards
Paru

If you were to input the actual stiffness and your analysis resulted in a failure, then yes, you are required to input the struct stiffness.

Otherwise, no, you aren't.

Sounds like you've been instructed to do so. If that's the case, where did the instruction come from? I can't think of a scenario when it is necessary to model the stiffness of a strut. If one end of the strut is attached to a relatively flimsy structural member, then in CAESAR I may model the strut as a rod with stiffness. And the stiffness would be that of the structural member, not the axial stiffness of the strut.

it was client comment to use equivalent stiffness for strut support. im still not convinced why this requirement is only for strut.I have similar arrangement of piping where instead of strut i used shoe support ,in this case we are not instructed to use any stiffness.

interesting indeed.

May be the strut you have specified has lower rated load with high slenderness ratio