Civil Engineering Reference
In-Depth Information
125 kN
125 kN
125 kN
125 kN
B
A
Case of loading 1
1.6
1.6
1.6
0.2
5 m
Y
A
= 260.0 kN
Y
B
= 240.0 kN
Figure 4.6 Cases of loading for the maximum shear force acting on a stringer.
models presented in
Chapters 6 and 7
can be used to analyze the bridges and
provide more accurate predictions for the deflections and other serviceabil-
ity limit state cases of loading.
Shearing Force Due to Dead and Live Loads with Dynamic
Effect Added (Q
D+L+F
)
There is only a single case of loading for live loads to produce a maximum
shear force at the supports of the stringer, which is shown in
Figure 4.6
:
Q
L
:
L
:
¼
260 kN
Q
D+L+
F
¼Q
D
:
L
:
g
g
+
FQ
L
:
L
:
g
q
¼
12
1
:
2+1
:
552
260
1
:
45
¼
599
:
5kN
Design Bending Moment (M
Ed
) and Shear Force (Q
Ed
)
M
Ed
¼M
D+L+
F
¼
622
:
8kNm
Q
Ed
¼Q
D+L+
F
¼
599
:
5kN
Design of Stringer Cross Section
W
pl
f
y
g
M0
M
c
,
Rd
¼
for classes 1 and 2
W
pl
275
1
8
10
6
622
:
¼
0
W
PL
¼
2,264,727mm
3
:
7cm
3
Choose UB 533
210
92 (equivalent to American W21
62), shown
chosen,
¼
2264
:
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