When calculating the allowable axial stress (ASD 9th) or the design compressive strength, the program checks for slender compression elements in the column section and will not design slender sections except in the case of the AS 4100, AISC 360-16 (ASD and LRFD), AISC 360-10 (ASD and LRFD) and AISC 360-05 (ASD and LRFD) where design of slender section design is considered.

For AISC 360-16 (ASD and LRFD), AISC 360-10 (ASD and LRFD), AISC 360-05 (ASD and LRFD), ASD 9^th ed. and LRFD 3^rd ed. the program will not select a column whose slenderness ratio Kl/r exceeds 200.

For CAN/CSA-S16-01 and S16-09 the program will not select a column whose slenderness ratio Kl/r exceeds 200.

For BS 5950 the program will not select a column whose slenderness ratio Kl/r exceeds 180.