Round HSS Flexural Design per AISC 360-16 with ideCAD

How does ideCAD calculate the flexural strength of round HSS according to AISC 360-16?

• The flexural strength of steel elements is calculated automatically according to AISC 360-16.

• The nominal flexural strength limit states yielding, and local buckling are controlled automatically according to AISC 360-16.

• For design members for flexure, sections are automatically classified as compact, noncompact, or slender-element sections, according to AISC 360-16.

Symbols

D : outside diameter of round HSS, in. (mm)
E : Modulus of elasticity of steel = 29,000 ksi (200 000 MPa)
F_cr : Critical stress, ksi (MPa
F_y : Specified minimum yield stress of the type of steel being used, ksi
M_n : The nominal flexural strength
M_p : Plastic bending moment
S : elastic section modulus about the axis of bending, in.³ (mm³)
t = design wall thickness of HSS member, in. (mm)
Z = plastic section modulus about the axis of bending, in.³ (mm³)

The nominal flexural strength, M_n, should be the lower value obtained according to the limit states of yielding (plastic moment), and local buckling.

Yielding Limit State

Local Buckling Limit State

• The limit state of local buckling does not apply to compact sections.

• The nominal flexural strength, M_n, is calculated below for noncompact sections.

• The nominal flexural strength, M_n, is calculated below for slender sections.

Next Topic

Tees and Double Angles Flexural Design per AISC 360-16 with ideCAD