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Asp 
Area of spiral reinforcement, in2
At

Area of one leg of a closed stirrup resisting torsion within a
distance s, in2
A(t)H

Required area of the horizontal leg of a closed tie resisting
torsion, in2
A(t)V

Required area of the vertical leg of a closed tie resisting
torsion, in2
Av

Total area of stirrups resisting shear, in2
b

Width of the beam, in
bt

Centertocenter dimension of a closed rectangular tie along b,
in
B

Peak pressure of dynamic loading, psi
Cm

Equivalent moment correction
d

Distance from extreme compression fiber to centroid of tension
reinforcement, in
d'

Distance from extreme compression fiber to centroid of compression
reinforcement, in
D

Overall diameter of circular section, in
DS

Diameter of the circle through centers of reinforcement arranged in
a circular pattern, in
Dsp 
Diameter of the spiral measured through the centerline of the
spiral bar, in
DIF

Dynamic increase factor
e

Actual eccentricity of applied load, in
e'

Eccentricity of axial load at end of member measured from the
centroid of the tension reinforcement, in
eb

Balanced eccentricity, in
emin
Minimum design eccentricity, in
ex

Eccentricity of axial load causing a moment about the xaxis, in
ey

Eccentricity of axial load causing a moment about the yaxis, in
E

Modulus of elasticity, psi
Ec

Modulus of elasticity of concrete, psi
2.08125


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