Civil Engineering Reference
In-Depth Information
Multiplying through by 1755
1755
P
ni
4.044
3.832
1
P
ni
255.3 k
If the moments in the weak direction (
y
axis here) are rather small compared to
bending in the strong direction (
x
axis), it is rather common to neglect the smaller mo-
ment. This practice is probably reasonable as long as
e
y
is less than about 20% of
e
x
,
since the Bresler expression will show little reduction for
P
ni
. For the example just
solved, an
e
y
equal to 50% of
e
x
caused the axial load capacity to be reduced by approx-
imately 40%.
Example 10.9 illustrates the design of a column subject to biaxial bending. The
Bresler expression, which is of little use in the proportioning of such members, is used to
Richmond Convention
Center, Richmond,
Virginia. Notice column
size changes. (Courtesy of
EFCO.)
