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American Steel Design
Section 2
2-32
Bending-Axial Stress Interaction
Members subjected to both axial and bending stresses are
proportioned according to section 10.36 of the AASHTO steel
code. All members subject to bending and axial compression are
required to satisfy the following formula:
f
F
Cf
fFF
Cf
fFF
a
a
mx bx
aexbx
my by
aeyby
+
−
+
−
<
(/) (/)
.
11
10
at intermediate points, and
f
F
f
F
f
F
a
y
bx
bx
by
by
.
.
472
10++ <
at support points.
The start and end nodes of a member are treated as support points.
For members subject to axial tension and bending, the following
equations are checked.
by
by
bx
bx
a
a
F
f
F
f
F
f
++
<1.0
at intermediate points, and
by
by
bx
bx
y
a
F
f
F
f
0.472F
f
++
<1.0
at ends of member.