Civil Engineering Reference
In-Depth Information
30 kN/m
30 kN/m
2 m
6 m
6 m
2 m
60 kN m
60 kN m
-
B.M.D.
Figure 4.47 Case of loading for maximum negative bending moment from live loads
acting on an intermediate cross girder.
ð Þ ¼
30
2
1
¼
60 kNm
The case of loading for live loads to produce a maximum shear force at
the supports of an intermediate cross girder is shown in
Figure 4.48
.
It should
be noted that for this through bridge, cars are not allowed to go on top of the
supports, which are the main trusses, by the presence of sidewalks to avoid
direct collision forces with the main trusses, as shown in
Figure 4.48
:
Q
L
:
L
:
¼
877
M
L
:
L
:
maximum negative bending moment
:
6kN
Bending Moment Due to Dead and Live Loads with Dynamic Effect
Added (M
Ed
)
M
Ed
¼M
D
:
L
:
g
g
+
M
L
:
L
:
g
q
¼
768
1
:
3 + 2725
:
1
1
:
35
¼
4677
:
3kNm
Shearing Force Due to Dead and Live Loads with Dynamic Effect Added (Q
Ed
)
Q
Ed
¼Q
D
:
L
:
g
g
+
Q
L
:
L
:
g
q
¼
320
1
:
3 + 877
:
6
1
:
35
¼
1600
:
8kN
270
270
180
180
90
90
54 kN/m
30 kN/m
30 kN/m
15 kN/m
A
B
2 m
2
2
2
1
1
2
1
0.5
0.5
0.5
0.5
12 m
937.625 kN
529.375 kN
Figure 4.48 Case of loading for maximum shearing force from live loads acting on an
intermediate cross girder.
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