Civil Engineering Reference
In-Depth Information
PROBLEMS
Location of Plastic Centroids
In Problems 10.1 and 10.2 locate the plastic centroids if
4000 psi and
f
y
60,000 psi.
Problem 10.1
(
Ans.
12.40 in. from left edge)
10.4
Repeat Problem 10.3 if the strain on the left edge is
0.001.
c
f
10.5
Repeat Problem 10.3 if the strain on the left edge is
0.000. (
Ans. P
n
1077 k,
M
n
199.5 ft-k)
10.6
Repeat Problem 10.3 if the strain on the left edge is
0.001.
14"
2 #9
2 #11
10.7
Repeat Problem 10.3 if the tensile steel on the left
side yields and the right edge is at 0.003. (
Ans. P
n
498 k,
M
n
418.8 ft-k)
3"
3"
18"
24"
Design of Columns for Axial Load and Moment
In Problems 10.8 to 10.10 use the interaction curves in the
Appendix to select reinforcing for the short columns
shown, with
Problem 10.2
c
f
4000 psi and
f
y
60,000 psi.
Problem 10.8
Analysis of Columns Subjected to Axial Load and
Moment
10.3
Using statics equations, determine the values of
P
n
and
M
n
for the column shown, assuming it is strained
to
0.00300 on the right-hand edge and to
0.00200
on its left-hand edge.
4000 psi,
f
y
60,000 psi.
(
Ans. P
n
608.9 k,
M
n
399.1 ft-k)
Problem 10.9
(
One ans.
6 #9 bars)
c
f
#8 bars
14"
3"
18"
3"
24"
