Civil Engineering Reference
In-Depth Information
TABLE E7.4a
Design Forces
Shear Force,
Bending
Design Force
V
(kips)
Moment (ft-kips)
Dead load on unshored steel section, DL1
70
1430
Dead load on composite section (unshored), DL2
40
1070
Total DL
(
DL1
+
DL2
)
110
2500
Live load
+
37% impact (maximum)
376
7314
Maximum
(
DL1
+
DL2
+
LL)
486
9814
Live load
+
13% impact (fatigue)
310
6032
TABLE E7.4b
Steel Section Properties
A
(in.
2
)
Ay
b
(in.
3
)
y
)
2
(in.
4
)
I
o
(in.
4
)
Element
y
b
(in.)
y
b
−
y
(in.)
A
(
y
b
−
Top flange
50.00
88.75
4437.5
43.75
95,703
26.0
Web
53.13
45.00
2390.6
0
0
31,986
Bottom flange
50.00
1.25
62.5
−
43.75
95,703
26.0
153.13
6890.6
191,406
32,038
Composite steel-concrete section properties:
Short-term loads:
Ay
b
17578
265.6
=
A
=
66.18 in.,
A(y
b
−
I
o
=
y)
2
386,516 in.
4
.
I
g
=
+
162,134
+
224,382
=
201,100 in.
4
,
Assuming
I
n
steel section
=
0.90
I
o
=
0.90
(
223,444
)
=
363,234 in.
4
.
I
n
composite section
=
162,134
+
201, 100
=
Long-term loads:
Ay
b
10454
190.63
=
A
=
54.84 in.,
I
g
=
A(y
b
−
+
I
o
=
y)
2
299,065 in.
4
.
75,308
+
223,757
=
201,100 in.
4
,
Assuming
I
n
steel section
=
0.90
I
o
=
0.90
(
223,444
)
=
276,408 in.
4
.
I
n
composite section
=
75,308
+
201,100
=
Flexure and shear design
Flexural stresses are summarized in
Figure E7.4
and
Table E7.9
or
Figure E7.5
and
Table E7.10
for unshored and supported deck construction, respectively.
