Civil Engineering Reference
In-Depth Information
30.2 k
30.2 k
Δ
Δ
5.0
'
5.5
'
16
'
V
dyn
M
dyn
FIGURE E4.7
concrete deck slab is required (Figure E4.7).
9040 in.
4
,
I
B
=
n
=
8,
16
(
7
3
)
]=
H
=
(
8
)(
9040
)/
[
13.18 in./ft,
0.4
√
13.18
12
2.50
1
2.50
+
D
M
=
+
2.50
/
16
(
13.18
)
+
=
2.72 ft, use 2.50 ft,
1
D
V
=
d
=
2.50 ft, and
P
=
1.15
(
80
)(
2.5
)/
5
=
46.0 kips (for both shear and moment calculations).
Considering dynamic effects
:
RE
=
0.20
W(
5
)(
100
)/
16
W
=
6.25%,
I
V
=
39.5%(
Figure 4.9),
P
LL+I
=
0.90
(
1
+
0.063
+
0.395
)
46.0
=
60.3 kips
(
30.2 kips for each rail
)
,
V
LL+I
=
30.2 kips, and
M
LL+I
=
(
5.5
)
30.2
=
166.1 ft-kips.
4.4 OTHER STEEL RAILWAY BRIDGE DESIGN LOADS
Inadditiontodeadloadandliveloadeffects,environmentalforces(wind,thermal,and
seismic events) and other miscellaneous forces related to serviceability and overall
stability criteria must be considered in the design of steel railway bridges.
