D1.H.5 Member Selection
The member selection process involves the determination of the least weight member that PASSes the code checking procedure based on the forces and moments of the most recent analysis. The section selected will be of the same type as that specified initially. For example, a member specified initially as a channel will have a channel selected for it.
See T.1 – Steel Portal Frame for STAAD provides an example on the usage of the SELECT MEMBER command.