Design of Steel Columns for Combined Forces per AISC 360-16

Symbols

P_r = required axial strength determined using LRFD or ASD load combinations, kips (N)
P_c = available axial strength, kips (N)
M_r = required flexural strength, determined using LRFD or ASD load combinations, kip-in. (N-mm)
M_c = available flexural strength, kip- in. (N-mm)

Design for Axial Force and Flexural Moment

• The strength calculation considers the combined stresses created in the elements under flexural and axial force.

• The superposition of the stresses only applies to similar stresses.

• The superposition rule does not apply to stability losses.

Design with AISC 360-16

Equation H1.1 is used for biaxial and single symmetry axis members under the influence of axial compression and flexural moment.

Flexural design is explained under the title of Design of Steel Members for Flexure per AISC 360-16 §F

Compression design is explained under the title of Design of Steel Members for Compression per AISC 360-16 §E

• Design axial strength, (LRFD)

• Allowable axial strength (ASD)

• Design flexural strength, (LRFD)

• Allowable flexural strength (ASD)