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 f'c -
Static ultimate compressive strength of concrete, psi
f'dc-
Dynamic ultimate compressive strength of concrete, psi
fdy -
Dynamic yield stress of steel reinforcement, psi
fy
-
Static yield stress of steel reinforcement, psi
F
-
Coefficient for moment of inertia of cracked section
h
-
Overall depth of beam, in
ht
-
Center-to-center dimension of a closed rectangular tie along h, in
I
-
Moment of inertia, in4
Ia
-
Average moment of inertia of section, in4
Ic
-
Moment of inertia of cracked concrete section with equal
reinforcement in opposite faces, in4
Ig
-
Moment of inertia of gross concrete section about centroidal axis,
neglecting reinforcement, in4
k
-
Effective length factor
KE
-
Equivalent elastic stiffness, psi
K1
-
A factor equal to 0.85 for f'dc up to 4,000 psi and is reduced
by 0.05 for each 1,000 psi in excess of 4,000 psi
Lu
-
Unsupported length of column, in
m
-
Ratio of steel design strength to concrete design strength
M
-
Design moment, in-lb
Mb
-
Balanced moment, in-lb
Mn
-
Ultimate negative moment capacity, in-lb
Mo
-
Moment capacity of the column in the absence of any axial loads,
in-lb
Mp
-
Ultimate positive moment capacity, in-lb
Mu
-
Ultimate moment capacity, in-lb
M1
-
Value of smaller end moment on column; positive if member is bent
in single curvature and negative if bent in double curvature, in-lb
M2
-
Value of larger end moment on column, in-lb
p
-
Reinforcement ratio
2.08-126
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