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How does ideCAD calculate the flexural strength for compact I-shaped members and Channels according to AISC 360-16?

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Symbols

C_b : The lateral-torsional buckling modification factor
E : Modulus of elasticity of steel = 29,000 ksi (200 000 MPa)
F_cr : Lateral-torsional buckling stress for the section as determined by analysis, ksi (MPa
F_y : Specified minimum yield stress of the type of steel being used, ksi
I_ts : Effective radius of inertia
J : Torsional constant
h_o : Distance between the flange centroids, in. (mm)
L_b : Length between points that are either braced against lateral displacement of the compression flange or braced against twist of the cross section, in. (mm)
L_p : The limiting laterally unbraced length for the limit state of yielding, in. (mm)
L_r: The limiting unbraced length for the limit state of inelastic lateral-torsional buckling, in. (mm),
M_n : The nominal flexural strength
M_p : Plastic bending moment
r_y : Radius of gyration about y-axis
S_x : Elastic section modulus taken about the x-axis, in.³ (mm³)
Z_x = Plastic section modulus about the x-axis, in.³ (mm³)

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