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 Asp -
Area of spiral reinforcement, in2
At
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Area of one leg of a closed stirrup resisting torsion within a
distance s, in2
A(t)H
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Required area of the horizontal leg of a closed tie resisting
torsion, in2
A(t)V
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Required area of the vertical leg of a closed tie resisting
torsion, in2
Av
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Total area of stirrups resisting shear, in2
b
-
Width of the beam, in
bt
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Center-to-center dimension of a closed rectangular tie along b,
in
B
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Peak pressure of dynamic loading, psi
Cm
-
Equivalent moment correction
d
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Distance from extreme compression fiber to centroid of tension
reinforcement, in
d'
-
Distance from extreme compression fiber to centroid of compression
reinforcement, in
D
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Overall diameter of circular section, in
DS
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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
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Dynamic increase factor
e
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Actual eccentricity of applied load, in
e'
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Eccentricity of axial load at end of member measured from the
centroid of the tension reinforcement, in
eb
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Balanced eccentricity, in
emin-
Minimum design eccentricity, in
ex
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Eccentricity of axial load causing a moment about the x-axis, in
ey
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Eccentricity of axial load causing a moment about the y-axis, in
E
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Modulus of elasticity, psi
Ec
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Modulus of elasticity of concrete, psi
2.08-125
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