This slide contains how to calculate the rupture strength in the net section area, shear lag factor, and staggered hole configuration. Thank You.

1. 5 Minutes Structure 1

2. Topic –
Steel Design 03:
Rupture in Net Section Area
5 Minutes Structure 2

3. Tensile Resistance for Rupture in Net Section Area
𝑇𝑟 = φ𝑢 ∗ 𝐴𝑛𝑒 ∗ 𝐹𝑢
φu = 0.75
Fu = Ultimate Strength
Ane = Effective Net Area = U * An
5 Minutes Structure 3

4. How to Calculate Effective Net Area Ane?
Ane = U*An
U = Shear Lag Factor
If Material is stresses uniformly, U value will be 1.
Shear lag occurs due to non-uniform stress.
5 Minutes Structure 4

5. How to calculate shear lag? (CISC Handbook)
Clause 12.3.3
 WWF, W, M, S flange widths not less than two third
depths and structural tees cut from these shape.
U= 0.9
5 Minutes Structure 5

6.  Angles Connected by only one legs
Four or more transverse line of fasteners – U = 0.8
Fewer than four transverse line of fasteners- U= 0.6
 All other structural shapes
Three or more line of fasteners U= 0.85
Two transverse line of fastener U = 0.75
5 Minutes Structure 6

7. Net Area Calculation, An
An = Wn *t
Here, Wn = Net Width = W – (dh + 2 or 4)*n
dh = Depth of Holes
If the holes are punched, then take 4mm
If the holes are drilled, then take 2mm.
t = Thickness of Plate
n = number of holes along the path
5 Minutes Structure 7

8. 5 Minutes Structure 8

9. Staggered Holes
5 Minutes Structure 9

10. Staggered Holes
An = Wn*t +
𝑆2
4𝑔
∗ 𝑡
Here, s = Pitch (Center to Center Spacing of the bolts
along the direction of applied load)
g = Gauge (Center to Center Spacing of the bolts along
the perpendicular direction of applied load)
5 Minutes Structure 10

11. Thank You
5 Minutes Structure
5 Minutes Structure 11