Civil Engineering Reference
In-Depth Information
Bridge Input Parameters
Effective Width Calculation
Full Girder Width
Span
L
=
334.64
ft
L
eff
/4
12
t
+
max(
b
f
/2,
t
w
)
=
752.94
128
Slab
t
=
9.5
30
0.1
2.5
28
0.938
116
in
ft
Eff. width = Total use
330
Girder
S
=
Top Lat Brac =
Haunch =
Top flange
Web
Bot flange
Total steel D
S =
360
in (distance from top)
in
10
28
1.5
132
1.5
175.84 in
in
W
t
×
t
t
in
in
in
in
in
180.82 in
t
w
×
D
w
°
Angle (deg)
14
0.970296
W
b
×
t
b
135
(a)
Section
A
Ad
b
d
Ad
2
b/t
J
t
=
bt
3
/3
d
b
l
0
Top lat brac
1758.36
Top flange
84.00
134.25
11277.00
78.29
11.54
514919.98
15.75
63.00
Web
255.21
67.5
17226.87
34012.53
370569.13
268.09
6.02
Bot flange
172.50
0.75
129.38
−55.21
525722.67
32.34
76.67
Sum Σ =
511.71
17850.06
55.96
28633.25
1074655.18
370617.23
2103.12
69.02
Enclosed
A
0
in
2
606073.3
in
4
in
K
t
= 4
A
2
/Σ(
b/t
) +
J
t
y
bot
=
y
top
=
in
79.04
l
x
=
l
0
+
Ad
2
=
1445272.4
in
4
in
3
S
bot
=
25828.88
S
top
=
18284.3
in
3
(b)
Figure 8.25
(a) Box beam section properties at the midspan location. (b) Section properties (
N
=
Ininity). Highlighted areas are input items.
S
top
,
S
bot
, and
S
topc
refer to section moduli at the top and bottom of the steel girder and the top of concrete slab, respectively. (Continued)
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