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Unformatted text preview: wn in Fig. 32.14 (a), with the following
Flange and web thickness of the section = t
Width of the section, B = 4t
and depth or height of the section,
H = 5t
First of all, let us find whether the section
chosen is satisfactory or not.
We have already discussed that the connecting rod is considered like both ends hinged for
buckling about X-axis and both ends fixed for buckling about Y-axis. The connecting rod should be
equally strong in buckling about both the axes. We know that in order to have a connecting rod
equally strong about both the axes,
Ixx = 4 Iyy
Ixx = Moment of inertia of the section about X-axis, and
Iyy = Moment of inertia of the section about Y-axis.
In actual practice, Ixx is kept slightly less than 4 Iyy. It is usually taken between 3 and 3.5 and the
connecting rod is designed for buckling about X-axis.
Now, for the section as shown in Fig. 32.14 (a), area of the section,
A = 2 (4 t × t ) + 3t × t = 11 t2
Ixx = 1
4 t (5t )3 − 3t...
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- Spring '11