Civil Engineering Reference
In-Depth Information
M
L
:
L
:
maximum positive bending moment
ð
Þ
¼
552
:
2
5
264
2
45
2
:
5
1
:
25
12
:
5
2
:
5
3
:
75
¼
1975
:
2kNm
The case of loading for the evaluation of maximum negative bending
moment due to live loads on an intermediate cross girder can be also studied,
as shown in
Figure 4.173
.
The maximum negative bending moment is cal-
culated as follows:
M
L
:
L
:
maximum negative bending moment
ð
Þ
¼
264
0
:
5+45
1
0
:
5+25
2
2
¼
254
:
5kNm
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 4.174
.It
should be noted that for this deck bridge, cars are allowed to go on top
of the supports, which are the main trusses, as shown in
Figure 4.174
.
Q
L
:
L
:
¼
661
:
25 kN
264
264
45 kN/
m
45
kN/m
25 k
N/m
25
kN/m
5 m
2
m
1
5 m
1
2
m
254.5 kN m
254.5 kN m
-
B.M.D.
Figure 4.173 Case of loading for maximum negative bending moment from live loads
acting on an intermediate cross girder.
264
264
176
176
88
88
45 kN/m
25
kN/m
12.5
B
0.5
0.5
0.5
A
2.0
1.5
2
3
2
2
0.5
0.5
0.5
0.5
10 m
320.75 kN
1020.25 kN
Figure 4.174 Case of loading for maximum shearing force from live loads acting on an
intermediate cross girder.
Search WWH ::
Custom Search