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STAAD Commands and Input Instructions
Section 5
5-402
Notes
The FIXED GROUP + GROUP commands are typically entered
before the member selection for further analysis and design. This
facility may be effectively utilized to develop a practically
oriented design where several members need to be of the same
size.
All the members in a list for a specific GROUP command should
have the same cross section type. Thus, if the command reads
GROUP MEMB 1 TO 10
and member 3 is a W shape and member 7 is a Channel, grouping
will not be done. The 10 members must be either all W shapes or
all channels.
Also see section 5.47.3 note 3.