Joints - The Behaviour and Design of Steel Structures to EC3 - page 424

All bolts are Grade 8.8,
20mm diameter in 22mm
holes, with threads in the
shear plane

25 30 140 55 30 90 30

65
35
70
70
70
35

6

35
70
70
70
35

8

t =8mm
f y =355N/mm 2
f u =510N/mm 2

t =10mm
f y =355N/mm 2
f u

=510N/mm 2

(a) Semi-rigid web fin plate joint (b) Flexible end plate joint

Figure 9.22 Examples 1-9.

9.10.2 Example 2 - in-plane design resistance of a bolt group

Problem. Determine the design resistance of the bolt group in the web fin plate
joint shown in Figure 9.22a.

Solution. For 20mm Grade 8.8bolts, A s = A t = 245mm 2 ,

α v = 0.6, EC3-1-8T3.4

f ub = 800N / mm 2 ,

EC3-1-8T3.1

and so
F v , Rd = 0.6 × 800 × 245
1.25

N = 94.1kN. EC3-1-8T3.4

Using this with the solution of example 1,

0.370 Q ≤ 94.1 so that Q v ≤ 254.0.

9.10.3 Example 3 - plate-bearing resistance

Problem. Determine the bearing resistance of the web fin plate shown in
Figure 9.22a.