Bentley 2006 User Manual
Section 3
3-15
any of the radial axes. The values printed for the TRACK 1.0
output are:
P0
= Maximum purely axial load carrying capacity of the
column (zero moment).
Pnmax
= Maximum allowable axial load on the column
(Section 10.3.5 of ACI 318).
P-bal
= Axial load capacity at balanced strain condition.
M-bal
= Uniaxial moment capacity at balanced strain condition.
e-bal
= M-bal / P-bal = Eccentricity at balanced strain
condition.
M0 =
Moment
capacity
at zero axial load.
P-tens
= Maximum permissible tensile load on the column.
Des. Pn = Pu/PHI where PHI is the Strength Reduction Factor
and Pu is the axial load for the critical load case.
Des. Mn = Mu*MMAG/PHI where PHI is the Strength Reduction
Factor and Mu is the bending moment for the
appropriate axis for the critical load case. For circular
columns,
appropriate axis for the critical load case. For circular
columns,
u
uy
M
M
M
=
+
2
2
uz
e/h
= (Mn/Pn)/h where h is the length of the column.
Example for column design per the ACI 318-2002 code
UNIT KIP INCH
START CONCRETE DESIGN
CODE ACI 2002
or
CODE ACI
FYMAIN 58 ALL
MAXMAIN 10 ALL
CLB 2.5 ALL
START CONCRETE DESIGN
CODE ACI 2002
or
CODE ACI
FYMAIN 58 ALL
MAXMAIN 10 ALL
CLB 2.5 ALL