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 (14) Determine the actual thickness of the foundation.
d
=
106.2 inches
db
=
1.41 inches
c
=
3.0 inches
Tc
=
106.2 + 1.41/2 + 3.0
=
109.9 inches
Use Tc = 110 inches.
5.
NOTATION.
a
-
Depth of equivalent rectangular stress block, in
A
-
Surface area of foundation, ft2
As
-
Area of tension reinforcement, in2
b
-
Width of compression face, in
B
-
Total width of foundation, in
c
-
Thickness of bottom concrete cover, in
d
-
Distance from extreme compression fiber to centroid of
tension reinforcement, in
db
-
Diameter of tension reinforcement bar, in
dc
-
Distance between tension and compression reinforcement, in
dcBw
-
Distance between tension and compression in reinforcement in
back wall
dcF
-
Distance between tension and compression in reinforcement in
foundation
dcsw
-
Distance between tension and compression in reinforcement in
side wall
fc
-
Friction factor
f'c
-
Compressive strength of concrete, psi
fds
-
Dynamic design strength for the reinforcement
fdy
-
Dynamic yield stress of reinforcement, psi
fs
-
Design stress for reinforcement, psi
fy
-
Static yield stress of steel, psi
HW
-
Height of wall, ft.
_
ib
-
Average impulse load, psi-ms
*lcr
-
Distance to critical section, in
2.08-326
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