Civil Engineering Reference
In-Depth Information
FIGURE 7.22
Section of column tested by Memon and Sheikh (2005).
Example 7.3: Analysis
One of the columns that were tested by Memon and Sheikh (2005) is investigated
in this example. The following are the properties of the column:
Height
12 in.
305 mm
Width
12 in.
305 mm
Clear cover
1 in.
25 mm
r
c
0.64 in.
16.26 mm
f
c
6.19 k si
42.7 MPa
n
×
t
f
4 × 0.05 in.
4 × 1.27 mm
E
f
2,864.33 ksi
19,761 MPa
ε
fu
0.0228
0.0228
f
yt
66.63 ksi
459.7 MPa
Hoop spacing
11. 8 in.
299.7 mm
Hoop diameter
#3
9.5 mm
Longitudinal bars
8 #6 (
ϕ
=
0.77 in.)
8
ϕ
19.6 mm
f
y
67. 4 3 k s i
465.2 MPa
Draw the interaction diagram per ACI 440.2R-08 then use KDOT Column Expert.
Solution:
Using Equation (7.7):
2
nt E
D
ε
=
×× ×
2
40.05
2864.33
×
0.586
×
0.0228
fffe
f
=
=
0.902ksi
l
2
2
12
+
12
f
f
0.902
6.19
l
c
=
=
0.146
>
0.08 , stress-strain curve is ascending
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