Civil Engineering Reference
In-Depth Information
Problem 2.14
2.17
Using transformed area, what allowable uniform
load can this beam support in addition to its own weight
for a 28-ft simple span? Concrete weight
150 lb/ft
3
,
f
s
24,000 psi, and
f
c
1800 psi. (
Ans.
2.757 k/ft)
5"
5"
5"
4"
6"
8"
6"
4"
30"
M
= 180 ft-k
n
= 9
8"
23"
32"
n
= 8
4 #10
17"
5 #10
3"
15"
3"
2.15
Using the transformed-area method, compute the re-
sisting moment of the beam of Problem 2.10 if
f
s
24,000 psi and
f
c
1800 psi. (
Ans.
280.6 ft-k)
20"
2.16
Compute the resisting moment of the beam of Prob-
lem 2.13 if eight #9 bars are used and if
n
10,
f
s
20,000 psi, and
f
c
1125 psi. Use the transformed-area
method.
For Problems 2.18 to 2.21 determine the flexural stresses in these members using the transformed-area method.
Problem 2.18
48"
4"
M
= 70 ft-k
n
= 9
21"
14"
3 #10
3"
12"
