Civil Engineering Reference
In-Depth Information
100
90
80
70
60
50
40
30
20
10
0
-15
-10
-5
5
Flexural stress (ksi)
0
10
15
20
25
FIGURE E7.5
Composite steel and concrete section flexural stresses—shored construction.
Combined bending and shear:
0.75
F
y
≤
0.75
50
1.05
f
v
F
y
1.05
486/53.13
50
f
b
=
22.38
≤
−
−
≤
27.9 ksi,
but no greater than 27.5 ksi. OK
Flange-to-web connection
Only unshored construction is considered in the flange-to-web connec-
tion design for brevity. Similar calculations may be performed if a shored
construction method is utilized.
TABLE E7.10
Composite Steel and Concrete Section Flexural Stresses—Shored
Construction
DL Flexural
Maximum LL
+
I
Range of LL
+
I
Maximum
Stress on
Flexural Stress on
Flexural Stress on
Flexural
Location
Composite Section
Composite Section
Composite Section
Stress
(Figure E7.3)
(
n
=
24) (ksi)
(
n
=
8) (ksi)
(
n
=
8) (ksi)
(ksi)
Top concrete
0.19
0.96
0.79
1.15
Bottom concrete
0.15
0.68
0.56
0.83
Top steel
3.53
5.41
4.47
8.94
Bottom steel
5.95
15.99
13.19
21.94
