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 E7.4
Compositesteelandconcretesectionflexuralstresses—unshoredconstruction.
Shear buckling:
2.12
t
w
E
2.12
(
0.625
)
29,000
50
h
=
85
≥
F
y
≥
≥
31.9 in.
Therefore, transverse web stiffeners are required.
TABLE E7.9
Composite Steel and Concrete Section Flexural Stresses—Unshored
Construction
Range of LL
+
I
DL1 Flexural
DL2 Flexural
Maximum LL
+
I
Flexural
Stress on
Stress on
Flexural Stress on
Stress on
Maximum
Noncomposite
Composite
Composite
Composite
Flexural
Location
Section
Section
Section
Section
Stress
(Figure E7.3)
(
n
=
1) (ksi)
(
n
=
24) (ksi)
(
n
=
8) (ksi)
(
n
=
8) (ksi)
(ksi)
Top concrete
—
0.08
0.96
0.79
1.04
Bottom concrete
—
0.06
0.68
0.56
0.74
Top steel
3.46
1.51
5.41
4.47
10.38
Bottom steel
3.84
2.55
15.99
13.19
22.38
