Purpose: Used to define type of girder steel.
--> Given in girder input
Activates parenthesized Category A fatigue stresses in Table 10.3.1A or Category B in 1994 AASHTO LRFD table 6.6.1.2.3-1 for such steel (whether or not a weathering steel has been specified by type (see STEEL , TOP FLANGE STEEL , BOTTOM FLANGE STEEL , WEB STEEL , STIFFENER STEEL )