Civil Engineering Reference
In-Depth Information
Figure 13.15
Base Thickness
Assume base
t
7% to 10% of overall wall height:
t
(0.07)(21)
1.47
Say 1
6
Height of stem
21
0
minus 1
6
19
6
Base Length and Position of Stem
Calculating horizontal forces without load factors, as shown in Figure 13.16.
a
C
a
wh
(0.32)(100)(21)
672 lb
1
2
H
1
(21)(672)
7056 lb
H
2
(21)(96)
2016 lb
W
(
x
)(24)(100)
2400
x
M
a
0
x
2
(7056)(7.00)
(2016)(10.5)
(2400
x
)
0
x
7.67
3
2
b
(7.67)
11.505
Say 11
6
The final trial dimensions are shown in Figure 13.22.
