Purpose: Used to specify bottom flange width or set its limits for design generation.
--> Given in girder design input
Bottom flange width design settings (Default limits: plate girder 9.0-30.0 inches or 200-750 mm, box girder 30.0-180.0 inches or 750-4575 mm). Bottom flange width can be specified (USE BFW), or limits can be adjusted (UPPER LIMIT BFW, LOWER LIMIT BFW) using a single value, or a list of values to vary by web section.