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How does ideCAD calculate steel members' shear strength according to AISC 360-16?

Symbols

E = Modulus of elasticity of steel = 29,000 ksi (200 000 MPa)
F_y = Specified minimum yield stress
h = clear distance between flanges less the fillet at each flange, in. (mm)
V_n = Nominal shear strength, kips (N)
t_w = thickness of web, in. (mm)
λ_w = Limiting width-to-thickness parameter

In design per share, it is assumed that shear force is completely carried by the web, no interaction between bending and shear occurs, yield stress in shear is,

• The design shear strength =

  Mathinline
  body $$ \normalsize \phi_vV_n $$

• The design shear strength =

  Mathinline
  body $$ \normalsize V_n/\Omega_v $$

The nominal shear strength, V_n, shall be determined depending on the slenderness defined by (h/t_w) according to the limit state of shear yielding and shear buckling.

• If

  Mathinline
  body --uriencoded--$$ \normalsize \lambda_w=\dfrac%7Bh%7D%7Bt_w%7D \le \lambda_%7Bpv%7D=2.24 \sqrt%7B \dfrac%7BE%7D%7BF_y%7D %7D $$

  satisfies, shear yielding controls.

• If

  Mathinline
  body --uriencoded--$$ \normalsize \lambda_w=\dfrac%7Bh%7D%7Bt_w%7D > \lambda_%7Bpv%7D=2.24 \sqrt%7B \dfrac%7BE%7D%7BF_y%7D %7D $$

  satisfies, shear buckling controls.