Purpose: Used to indicate whether bracing braces the bottom flange in Girder System Projects.
--> Given in girder input
A list of zeros and ones to designate bracing locations (BR) which do not brace the bottom flange. For example, BRBF 1 1 1 0 0 1 1 1 1 indicates the fourth and fifth of nine brace locations do not brace the bottom flange. This might occur, for example, if relatively shallow cross frames are used at deeper regions of haunched webs.
Note that in Girder System Projects the bracing locations shown in BR data include all support locations and so these will count as bracing locations unless otherwise specified with BRBF data.