Purpose: Used to specify top flange width or set its limits for design generation.
--> Given in girder design input
Top flange width design settings (Default limits: 8.0-20.0 inches or 200-750 mm). If open box girder, TFW is the width of the flange on one of the webs. If closed box girder, TFW is the entire width of the top flange. Top flange width can be specified (USE TFW), or limits can be adjusted (UPPER LIMIT TFW, LOWER LIMIT TFW) using a single value, or a list of values to vary by web section.