Civil Engineering Reference
In-Depth Information
l
1
¼
93
:
9
0
:
924
¼
86
:
7636
6160
45
1
l¼
7636
¼
1
:
547
:
9
86
:
The axial compressive force in the diagonal bracing member
(
N
Ed
¼
298.7 kN):
N
Ed
N
b
,
Rd
1
:
0
wAf
y
g
M1
where
N
b
,
Rd
¼
4cm
2
A¼
2
43
:
2
¼
86
:
1
F
+
w¼
p
but
w
1
:
0
l
2
F
2
h
i
+
l
2
51+
a l
0
F¼
0
:
:
2
¼
1
547
2
F¼
0
:
51+0
:
34 1
ð
:
547
0
:
2
Þ
+1
:
:
926
1
w¼
926 +
p
¼
0
:
325 but
w
1
:
0
926
2
547
2
1
:
1
:
1
:
0
:
325
86
:
4
100
275
1
Then,
N
b
,
Rd
¼
¼
702,000N
:
1
N
b
,
Rd
¼
702 kN
>
N
Ed
¼
298
:
7 kN Then O
ð
:
K
:
Þ
4.2.10 Design of Stringer-Cross Girder Connection
The stringer is designed as a simply supported beam on cross girders; there-
fore, the connection is mainly transferring shear forces (maximum reaction
from stringers of 599.5 kN) (see
Figure 4.29
)
. Using M27 high-strength pre-
tensioned bolts of grade 8.8, having
f
ub
of 800 MPa, shear area
A
of
4.59 cm
2
, and gross area
A
g
of 5.73 cm
2
, we can determine the required
number of bolts, following the rules specified in EC3 (BS EN 1993-1-8)
[2.13], as follows:
a
V
f
ub
A
g
M2
F
v
,
Rd
¼
:
6
800
459
1
:
25
0
F
v
,
Rd
¼
¼
176,256N
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