Find the
-value for all
columns of the following frame. All columns are orientedwith the web in the plane of the paper, (the plane of
buckling).
Section properties
The section properties can be found in the Dimensions and
Properties section of the
Manual . The
lengths are found on
.
W8 x 31
W14 x 30
W18 x 50
and
Solution
Since the columns and beams are oriented with the web as the
plane of buckling, the axis of bending is the x-axis.Therefore, all values of
,
above, are with respect to the x-axis.
For each column:
First we must determine the
values for each corner of
the frame with the equation:
where,
is for column and
is for girder or beam.
Then we use Fig. C-C2.2a and Fig. C-C2.2b in the
Manual to find the
values for each column.
If a column is sidesway inhibited, it is braced againstany sideways movement; if a column is sidesway
uninhibited, it is not braced in the sidewaysdirection.
Column ab
because it is a pinned support.
is sidesway inhibited (the support at
braces any sideways motion
of the column) so lining up the value of
and
on 16.1-191 gives:
Column cd
because it is a pinned support.
is sidesway inhibited (the support at
braces any sideways motion
of the column)so lining up the value of
and
on 16.1-191 gives:
Column gf
because it is a pinned support that cannot move sideways,
so it is like a fixed support (?check on this).
is sidesway inhibited (the support at
braces any sideways motion
of the column) so lining up the value of
and
on 16.1-191 gives:
Column ed
from before.
is sidesway uninhibited (there is no sideways
bracing for the top portion of the frame) so lining up thevalue of
and
on 16.1-192 gives:
Column gh
from before.
from before.
is sidesway uninhibited (there is no sideways
bracing for the top portion of the frame) so lining up thevalue of
and
on 16.1-192 gives:
Questions & Answers
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