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Section 2
2-69
CASE 2A: PNA IN FLANGE OF STEEL BEAM
T
P.N.A.
r
h
t
e
C
1
e
2
S
C
f
b
y
C
f
y
f
y
f
y
f
Figure 2.8
Calculate:
y =
()
yf
f
f . b
C
where, b
f
= width of flange
The point of action of the tensile force is the centroid of the steel
area below the PNA. After finding that point, e
1
and e
2
can be
calculated.
Moment Capacity =
(
)
2s
1
fb
e . C e . C +φ