Members subjected to both axial compression and bending stresses are proportioned to satisfy API formula 3.3.1-1 and 3.3.1-2 when f_a/F_a > 0.15, otherwise formula 3.3.1-3 applies. It should be noted that during code checking or member selection, if f_a/F_a > 1.0, the program does not compute the second 3.3.1-1/2.