Civil Engineering Reference
In-Depth Information
so that
Q
w
≤
108.6
<
231.9
(
≥
Q
ty
)
.
Directional method of EC3-1-8.
Using equations 9.32-9.34,
σ
⊥
=
(
−
0.325
Q
×
10
6
)
×
(
268.7
/
2
)
sin45
o
=−
1.688
Q
N
/
mm
2
2
×
(
268.7
3
/
12
)
×
(
8
/
√
2
)
τ
⊥
=
(
−
0.325
Q
×
10
6
)
×
(
268.7
/
2
)
cos45
o
=−
1.688
Q
N
/
mm
2
2
×
(
268.7
3
/
12
)
×
(
8
/
√
2
)
Q
×
10
3
2
×
268.7
×
(
8
/
√
2
)
=
0.329
Q
N
/
mm
2
τ
||
=
The strength condition is
510
0.9
×
1.25
EC3-1-8 4.5.3.2(6)
{
(
−
1.688
Q
)
2
+
3
×[
(
−
1.688
Q
)
2
+
(
0.329
Q
)
2
]}
0.5
≤
so that
Q
w
≤
132.4
<
231.9
(
≥
Q
ty
)
and
1.688
Q
≤
0.9
×
510
/
1.25
EC3-1-8 4.5.3.2(6)
so that
Q
w
≤
217.5
>
132.4
and so the joint resistance is governed by the shear and bending capacity of the
welds.
9.10.6 Example 6 - bolt slip
Problem.
If the bolts of the semi-rigid web fin plate joint shown in Figure 9.22a
are preloaded, then determine the value of
Q
at which the first bolt slip occurs, if
the joint is designed to be non-slip in service and the friction surface is Class B.
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