F11Rectangular bars and rounds

This section applies to rectangular bars bent about either geometric axis, and rounds.

The nominal flexural strength, Mn, shall be the lower value obtained according to the limit states of yielding (plastic moment) and lateral-torsional buckling.

F11.1 Yielding

For rectangular bars

(F11-1)

For rounds

(F11-2)

F11.2 Lateral-Torsional Buckling

Lbd 0.08E (a) For rectangular bars with bent about their major axis, rectangular 12 F bars bent about their minor axis, and rounds, the limit state of lateral-torsional buckling does not apply.

(b) For rectangular bars with $\frac{0.08 E}{F_{y}}<\frac{L_{b} d}{t^{2}} \leq \frac{1.9 E}{F_{y}}$ bent about their major axis

(F11-3)

where

$L_{b}=$ length between points that are either braced against lateral displacement of the compression region, or between points braced to prevent twist of the cross section, in. (mm)

(c) For rectangular bars with $\frac{L_{b} d}{t^{2}}>\frac{1.9 E}{F_{y}}$ bent about their major axis

(F11-4)

where

(F11-5)