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(b) For a rectangular tied column with equal reinforcement on
opposite faces (Figure 36a), the ultimate axial load capacity at a given
eccentricity is approximated by:
EQUATION:
e' +(1e')2+ 2p[(m1)(2h) + e'1/2
Pu = 0.85f'dc
bd1p 
(64)
d
d
d
d
in which,
EQUATION:
p = As
(65)
bd
h
EQUATION:
e' = e + d 
(66)
2
fdy
EQUATION:
m =
(67)
0.85 f'dc
where,
p = percentage of reinforcement on one
face of section
e' = eccentricity of axial load at end of
member measured from the centroid of the
tension reinforcement, in
(c) For a circular section with spiral reinforcement, Figure
36b, the ultimate axial load capacity at a given eccentricity is
approximated by:
EQUATION:
Pu = 0.85 f'dc D2 0.85e
ptmDs 1/2
(  0.38)2 +
D
2.5 D
0.85e
 (  0.38)
(68)
D
where,
pt = total percentage of reinforcement and is defined in
Equation (61).
2.0896


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