# 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, P_{n}
, 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
(A_{e}
) 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.