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Tip

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

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Symbols

d: depth of tee or width of web leg 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
Lb: Length between points that are either braced against lateral displacement of the compression flange or braced against twist of the cross-section, in. (mm)
Lp: The limiting laterally unbraced length for the limit state of yielding, in. (mm)
Lr: The limiting unbraced length for the limit state of inelastic lateral-torsional buckling, in. (mm),
Mn: The nominal flexural strength
Mp: Plastic bending moment
My: Yield moment about the axis of bending, kip-in. (N-mm)
Sx: elastic section modulus, in.3 (mm3)
Sxc: elastic section modulus referred to the compression flange, in.3 (mm3)
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, described in Table B4.1b

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