DMAX
DMIN
PROFILE
All members within a group must be of the same cross section type. If one or more of the members has a different cross-setion type, the grouping is ignored by the program.
In a Member Selection, STAAD.Pro finds the lightest acceptable section while incorporating any specified constraints. Additionally,
STAAD.Pro only considers sections that have the same cross sectional shape as the initial member. For example, if a member is
initially specified as an angle, only other angle shapes are considered when the selection routine is performed.(如果用的初始截面是user table里的,那么优化的时候会从相同的table里找截面)
If you want to retain the member groups for all subsequent commands, select the FIXED GROUP tab and then click Add. If you do not use the FIXED GROUP option, then the members are grouped once and then this grouping is ignored for subsequent commands. If you do add the FIXED GROUP command, then all subsequent member selection commands will apply to the group again.