Purpose: Used to specify bracing section properties in Girder System Projects. (Not applicable to Line Girder Projects.)
--> Given in bracing input
A list of St. Venant torsional moments of inertia (in4 or mm4) by group (see GRP-i) as an alternative to giving bracing types and shapes. Zero values for any groups indicate types and shapes are specified for such groups and torsional stiffness determined for those groups by the program. (Also see GROUPI , GROUPWT)
For example, GROUPJ 0 240 0 indicates the shapes and bracing type are given for groups 1 and 3, but a torsional moment of inertia of 240 is to be used for group 2.