C-F6F6 I-shaped members and channels bent about their minor axis

I-shaped members and channels bent about their minor axis do not experience lateral-torsional buckling or web local buckling. The only limit states to consider are yielding and flange local buckling. The User Note informs the designer of the few rolled shapes that need to be checked for flange local buckling. The limiting width-to-thickness ratios for rolled I-shaped members given in Table B4.1b are the same for major- and minor-axis bending. This is a conservative simplification. The limit of $1.6 F_{y} S_{y}$ in Equation F6-1 is intended to guard against substantial early yielding in channels subjected to minor-axis bending, potentially leading to inelastic response under service conditions. The minor-axis plastic moment capacity of I-sections rarely exceeds this limit.