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Section 4
4-15
b) When CF >= 1.00, the effect of CF and CL are
cumulative FBZ is taken as FBZ x CFZ x CLZ FBY is
taken as FBY x CFY x CLY
Min. Eccentricity:
The program checks against min. eccentricity in following cases:
a) The member is a FRAME member and not a truss member
and under compression.
b) The value of actual axial compressive stress does not
exceed 30% of the allowable compressive stress.
c) The actual moments about both axes are less than
moments that would be caused due to min. eccentricity. In
this approach, the moment due to min. eccentricity is taken
as the compressive load times an eccentricity of 1 in. or
0.1 x depth whichever is larger.
In case of min. eccentricity,
f
bz
is taken as f
a
x (6+1.5 x JZ)/(EZ/ZD) f
by
is taken as f
a
x (6+1.5
x JY)/ (EY/YD)
the following conditions are checked :
f
a
/FA + f
bz
/(FBZ-JZ x f
a
) =< RATIO and f
a
/FA + f
by
/(FBY-JY x
f
a
) =< RATIO
Shear Stresses:
Horizontal stresses are calculated and checked against allowable
values:
f
vz
= 3 x VY /(2 x Area x NSF) =< FVZ/f
vy
= 3 x VZ /(2 x Area x
NSF) =< FVY