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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)
Fy : Specified minimum yield stress of the type of steel being used, ksi
h : Distance as defined in AISC 360-16 Table 4.1b
Mn : The nominal flexural strength
Mp : Plastic bending moment
Sy : elastic section modulus taken about the y-axis, in.3 (mm3)
tf : the thickness of the flange, in. (mm)
Zy = Plastic section modulus about the y-axis, in.3 (mm3)
λp : Limiting slenderness for a compact flange, defined in Table B4.1b
λr : Limiting slenderness for a noncompact flange, defined in Table B4.1b

The nominal flexural strength, Mn, 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 for sections with compact flanges.

  • For sections with noncompact flanges The nominal flexural strength, Mn is calculated below.

  • For sections with slender flanges the nominal flexural strength, Mn is calculated below.

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