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 p'
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Compression reinforcement ratio
pb
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Balanced reinforcement ratio
pt
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Total reinforcement ratio
P
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Design axial load, lb
Pb
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Axial load at balanced condition, lb
Pc
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Critical axial load causing buckling, lb
Po
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Ultimate axial load for concentrically loaded column, lb
Pu
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Ultimate load for biaxial bending, lb
Px
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Ultimate axial load with bending about the x-axis only, lb
Py
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Ultimate axial load with bending about the y-axis only, lb
r
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Radius of gyration of column, in
ru
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Ultimate unit resistance, lb/in
Ru
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Total ultimate resistance, lb
s
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Spacing of torsion reinforcement in a direction parallel to the
longitudinal reinforcement, in
-
Pitch of spiral, in
ss
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Spacing of shear reinforcement in the direction parallel to the
longitudinal reinforcement, in
tm
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Time to maximum deflection, ms
T
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Duration of dynamic loading, ms
TN
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Natural period of vibration, ms
Tu
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Torsional moment at critical section, in-lb
vc
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Maximum shear capacity of an unreinforced web, psi
vtc -
Maximum torsion capacity of an unreinforced web, psi
vtu -
Nominal torsion stress in the direction of vu, psi
v(tu)H- Nominal torsional stress in the horizontal direction, psi
V(tu)V- Nominal torsional stress in the vertical direction, psi
vu
-
Nominal shear stress, psi
2.08-127
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