Civil Engineering Reference
In-Depth Information
Figure 9.7
9.11 COMPUTER EXAMPLE
EXAMPLE 9.4
Using SABLE32, determine the value of the axial load
P
n
that the column selected in Example 9.1
can support. Assume
d
2.5 in.
If the user will input the data requested on the screen and then click on “Show Column In-
teraction Diagram,” the value of
SOLUTION
P
n
will be the top value on the curve shown, as read on
the left-hand column. In this case, the reading is about 450 k. The detailed use of this
curve is described in Chapter 10.
PROBLEMS
9.1
Distinguish between tied, spiral, and composite
columns.
9.2
What are primary and secondary moments?
9.3
Distinguish between long and short columns.
9.4
List several design practices that will help make
the construction of reinforced concrete columns more
economical.
Problem 9.6
6 #9
bars
16"
16"
Problem 9.7
(
Ans.
609.2 k)
Analysis of Axially Loaded Columns
For Problems 9.5 to 9.8 compute the load-bearing
capacity of the concentrically loaded short columns.
f
y
60,000 psi and
4000 psi.
9.5
A 20 in. square column reinforced with 8 #10 bars.
(
Ans.
1005 k)
12"
8 #8 bars
c
f
20"
