8D.D.9 Calculation of Net Section Factor
The procedure for calculating the net section factor for an angle section is as follows:
 For a channel section, net section factor is taken to be 1.0.

For an angle section, it is the ratio of the net effective area, A_{net}, to the gross area, where:

Single angle connected by only one leg
whereA_{net} = A_{1} + A_{2} × K_{1}  A_{1}
=  net crosssectional area of the connected leg
 A_{2}
=  gross crosssectional area of the unconnected leg
 K_{1}
=  3·A_{1}/(3·A_{1} + A_{2})
The area of a leg of an angle = Thickness of angle × (length of leg – 0.5× thickness of leg)

Pair of angles placed backtoback connected by only one leg of each angle to the same side of a gusset plate
whereA_{net} = A_{1} + A_{2} · K_{1}  A_{1}
=  net crosssectional area of the connected leg
 A_{2}
=  gross crosssectional area of the unconnected leg
 K_{1}
=  5·A_{1}/(5·A_{1} + A_{2})
The area of a leg of an angle = Thickness of angle × (length of leg – 0.5× thickness of leg)

Double angles placed backtoback and connected to each side of a gusset plate
 A_{net} = gross area minus the deduction for holes
