My question concerns the Drift Control Module and the loads used for this analysis.
With the understanding that this Module follows Castigliano's Theorem, under what circumstances would it make sense to create a Virtual Work load case with a non-zero force at more than one level?
If trying to use the Drift Control Module to evaluate a structure's behavior for drift at each level (in the same direction) of a multi-story building, shouldn't a Virtual Work load case be created for each level where only the level of interest has a non-zero magnitude? And in turn, each of these Virtual Work load cases would have a separate load pair with the real load case of interest?
On a similar note, when or why would a factor other than 1 be used for a load pair?
Appreciate any insight.