I-shaped Members And Channels Bent About Their Minor Axis per AISC 360-16 with ideCAD

How does ideCAD calculate the flexural strength for doubly symmetric I-shaped members with compact webs and noncompact or slender flanges 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 are controlled automatically according to AISC 360-16.

• I-shaped members and channels bent about their minor axis flexural design are done automatically, according to AISC 360-16.

Symbols

b : for flanges of I-shaped members, half the full flange width, bf; for flanges of channels, the full nominal dimension of the flange, in. (mm)
E : Modulus of elasticity of steel = 29,000 ksi (200 000 MPa)
F_y : Specified minimum yield stress of the type of steel being used, ksi
h : Distance as defined in AISC 360-16 Table 4.1b
M_n : The nominal flexural strength
M_p : Plastic bending moment
S_y : elastic section modulus taken about the y-axis, in.3 (mm3)
t_f : the thickness of the flange, in. (mm)
Z_y = Plastic section modulus about the y-axis, in.³ (mm³)
λ_p : Limiting slenderness for a compact flange, defined in Table B4.1b
λ_r : Limiting slenderness for a noncompact flange, defined in Table B4.1b

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

Yielding Limit State

Flange Local Buckling Limit State

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

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

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

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