AISC 360-16
Compression members with slender elements
New design procedure is introduced for slender members in AISC 2016. The nominal compressive strength (
), shall be the lowest value based on the applicable limit state of flexural buckling, torsional buckling, and flexural torsional buckling in interaction with local buckling.
summation of the effective areas of the cross section based on reduced effective width, 
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Where:
And
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is calculated based on section E3 and E4 of AISC.
Flexural torsional buckling
Flexural torsional buckling for sections without slender members
The nominal compressive strength, 
, of single angle members shall be the lowest value based on the limit states of flexural buckling or flexural-torsional buckling. Flexural-torsional buckling need not be considered when 
This limit was 
in AISC 2010.
Flexural torsional buckling for single angles
The similar update applies on single angle sections for flexural torsional buckling which updates the limit from 
to 
in this version