How does ideCAD design castellated beams according to AISC 360-16?
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Symbols
Cb : The lateral-torsional buckling modification factor
Zx = Plastic section modulus about the x-axis, in.3 (mm3)
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
Fcr : Critical stress
K : Effective length factor
L: Laterally unbraced length of the member
Pr: Required axial force resistance for LRFD or ASD load combinations
Pc: Strength of axial compressive force available according to Section E
Mr: Required bending moment strength for LRFD or ASD load combinations
Mc: current bending moment strength according to Section F
r: Radius of gyration
λ: Width-to-thickness ratio for the element as defined in Section B4.1
λr : Limiting width-to-thickness ratio as defined in Table B4.1a
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
Sx : Elastic section modulus taken about the x-axis, in.3 (mm3)
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