Civil Engineering Reference
In-Depth Information
FIGURE 7.25
Section of column SC2 tested by Darby et al. (2011).
Example 7.4: Analysis
One of the columns that were tested by Darby et al. (2011) is investigated in this
example (Figure 7.25). The following are the properties of the column:
Height
11. 81 in.
300 mm
Width
11. 81 in.
300 mm
Clear cover
1 in.
25 mm
r
c
1.57 in.
39.88 mm
f
c
3.625 ksi
25.0 MPa
n
×
t
f
4 × 0.0063 in.
4 × 0.16 mm
E
f
31,030 k si
214.08 GPa
ε
fu
0.0145
0.0145
f
yt
60 ksi
413.93 MPa
Tie spacing
11 in.
279.4 mm
Tie diameter
#3
9.5 mm
Longitudinal bars
4 #8 (
ϕ
=
0.98 in.)
4
ϕ
24.9 mm
f
y
79.75 ksi
550.2 MPa
Draw the interaction diagram per ACI 440.2R-08 then use KDOT Column Expert.
Solution:
Using Equation (7.7):
2
nt E
D
2
40.0063
31030
0.586
0.0145
ε
=
×× ×
×
×
fffe
f
=
=
0.796ksi
l
2
2
11.81
+
11.81
f
f
0.796
3.625
0.08
, stress-strain curve is ascending
l
=
=
0.219
>
c
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