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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, psims
*lcr

Distance to critical section, in
2.08326


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