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, Anet, to the gross area, where:
-
Single angle connected by only one leg
whereAnet = A1 + A2 × K1 - A1
= - net cross-sectional area of the connected leg
- A2
= - gross cross-sectional area of the unconnected leg
- K1
= - 3·A1/(3·A1 + A2)
The area of a leg of an angle = Thickness of angle × (length of leg – 0.5× thickness of leg)
-
Pair of angles placed back-to-back connected by only one leg of each angle to the same side of a gusset plate
whereAnet = A1 + A2 · K1 - A1
= - net cross-sectional area of the connected leg
- A2
= - gross cross-sectional area of the unconnected leg
- K1
= - 5·A1/(5·A1 + A2)
The area of a leg of an angle = Thickness of angle × (length of leg – 0.5× thickness of leg)
-
Double angles placed back-to-back and connected to each side of a gusset plate
- Anet = gross area minus the deduction for holes
-