As stated in the Commentary to S16-14, the slenderness expressions provided in Clause 13.3.3 for ‘Single-Angle Members in Compression’ are not intended for use in the calculation of compressive resistance of single angles used as diagonal braces in a braced frame. When single-angle braces are used in a braced frame, they typically serve as tension-only braces due to their limited compression resistance. If they must resist significant compression with only one leg connected, they must be designed as eccentrically loaded columns. In this case, Clause 13.3.2 covers flexural and flexural-torsional buckling resistances and Clause 13.8.3 addresses combined axial compression and bending.
