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

Centertocenter 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, inlb
Mb

Balanced moment, inlb
Mn

Ultimate negative moment capacity, inlb
Mo

Moment capacity of the column in the absence of any axial loads,
inlb
Mp

Ultimate positive moment capacity, inlb
Mu

Ultimate moment capacity, inlb
M1

Value of smaller end moment on column; positive if member is bent
in single curvature and negative if bent in double curvature, inlb
M2

Value of larger end moment on column, inlb
p

Reinforcement ratio
2.08126