D1.A.10.2 Compression
Design of the members subject to compression is performed per chapter E of AISC 360-16.
All the cross-section profiles described in section 1A.10 are considered for compression.
The design compressive strength is calculated based on the applicable limit states of flexural buckling, torsional buckling, and flexural-torsional buckling modes as per Cl.E.1.
The nominal compressive strength, Pn , shall be the lowest value obtained based on the applicable limit states of flexural buckling, torsional buckling, and flexural-torsional buckling. In general, Table.E1.1 is followed for the choice of applicable sections/clauses for the various cross section shapes.
Limit States
The gross area is used for members with non-slender elements whereas the effective area, Ae, is used for slender elements. The effective width of a slender element of any section other than round HSS is calculated for each limit state of compression as per eq. E7-2 or eq. E7-3 depending on the condition mentioned in the specification. The effective area (Ae ) for a slender HSS round section is calculated as per cl. E7.2.
Slenderness Limits
The code does not mandate the maximum slenderness limit for members in compression. However, the program will check against a maximum slenderness ratio (L/r) which is specified using MAIN parameter whose default value is 180. The length considered to calculate the compression slenderness will be the full member length.