Civil Engineering Reference
In-Depth Information
Figure 13.27
Toe reinforcing.
Therefore, use
200
60,000
0.00333
A
s
(0.00333)(12)(20.5)
0.82 in.
2
/ft
Use #8 at 11
d
required calculated with ACI Equation 12-1 for #8 bottom bars with
c
3.50 in. and
K
tr
0
equals 33 in.
42 in. available
OK
Toe reinforcing is shown in Figure 13.27.
Selection of Dowels and Lengths of Vertical Stem Reinforcing
The detailed selection of vertical bar lengths in the stem is omitted here to save space,
and only a few general comments are presented. First, Table 13.1 shows the reduced
bending moments up in the stem and also shows the corresponding reductions in rein-
forcing required.
Table 13.1
Distance
Effective
A
s
from top
M
u
stem
d
required
Bars
(in.
2
/ft)
of stem
(ft-lb)
(in.)
needed
5
2987
11.04
Use
min
0.00333
0.44
#8 @ 18
10
16,213
12.58
Use
min
0.00333
0.50
#8 @ 18
15
46,080
14.12
0.00452
0.77
#8 @ 12
19.5
92,472
15.50
0.00786
1.46
#8 @ 6
