Dear Srs.,

There is the following statement in the Technical Reference Manual:

"An alternative school of thought believes that a "hot sustained" is only valid if (1) the sustained, primary loads are applied, (2) all springs are showing their Hot Load settings, and (3) any supports that lift off (or otherwise become non-active) have been removed from the model. An analysis such as this is achievable by setting the "Keep/Discard" status of the Restrained Weight case (the first hanger design load case) to "Keep", thus permitting the results of that case to be viewable as for any other load case. The Restrained Weight case automatically removes restraints that become non-active during the designated operating case, and apply the Hot Load at each of the hanger locations."

So to automatically remove all the restraints that become non-active during the design operating case you just have to set "keep" in the fist design load case, right? In this case we have this option just for model with hangers, what about analysis without hanger?

Thank you.

Hi Stress Engineers,
In addition to rliberato's query, by setting of Restrained Weight case to "KEEP", does lift off support automatically becomes non-active also to sustained case?



Any suggestions, comments and explainations subject to this matter are highly appreciated!

No - all that does is make the output (for that load case) available for review.

The restrained weight case will iterate and supports that lift off will be removed for the next iteration only. Once the load case solves, the restraints are active again for the next load case.

Richard Ay,
The mean purpose for this setting is to show all "lift off" supports which means having zero loads for (Fx, Fy, Fz, Mx, My, & Mz) in restraint report.!
Am I right?
In case for analysis model without hanger, do i need to add weight case because this case is not default as for analysis model with hanger?

The purpose of changing the HGR cases to "Keep" is so that you can view the results of those two cases - if for some reason you needed this information (which typically you don't).

You don't need the "restrained weight" case unless you're doing hanger design.

Richard Ay,
Thank you very much!

Ok.

Thank you for the support.