Purpose: Used to specify bottom flange thickness or set its limits for design generation.
--> Given in girder design input
Bottom flange thickness design settings (Default limits: 0.5-4.0 inches or 12-100 mm). Bottom flange thickness can be specified (USE BFT), or limits can be adjusted (UPPER LIMIT BFT , LOWER LIMIT BFT ) using a single value, or a list of values to vary by web section.