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Major and Minor axis of the column

 
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sathyace
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Joined: 04 Jun 2011
Posts: 78
PostPosted: Tue Nov 05, 2019 4:13 pm    Post subject: Major and Minor axis of the column Reply with quote
Hi All,

As we know that,practically major axis is perpendicular to the depth of the section and minor axis is parallel to the depth of the section.

Theoretically,is it calculated by using moment inertia?

Please find the attached image for reference.

Thank you,
sathya.

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kawshik9
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Joined: 28 Oct 2009
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PostPosted: Wed Nov 06, 2019 5:49 am    Post subject: Reply with quote
Yes, we need to calculate M.I to identify the major axis. Axis about which M.I is maximum we will call it as  Major axis and other orthogonal axis as minor axis.


  1. For a rectangular section, we will assume larger dimension to be depth and smaller dimension to be width. M.I of rectangular section about an axis perpendicular to larger dimension(Depth) is always maximum and M.I  about an axis parallel to larger dimension(depth) is always minimum.
  2. If we calculate M.I of Unsymmetrical sections, we will find the difference. Eg. L-Sections, Double-I Star sections etc.
  3. Its not like that always axis perpendicular to depth is major axis.

Regards,

Ramakanth.K
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lorissneed
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Joined: 11 Sep 2020
Posts: 1
PostPosted: Fri Sep 11, 2020 1:44 am    Post subject: Reply with quote
kawshik9 wrote:
Yes, we need to calculate M.I to identify the major axis. Axis about which M.I is maximum we will call it as  Major axis and other orthogonal axis as minor axis.


  1. For a rectangular section, we will assume larger dimension to be depth and smaller dimension to be width. M.I of rectangular section about an axis perpendicular to larger dimension(Depth) is always maximum and M.I  about an axis parallel to larger dimension(depth) is always minimum.
  2. If we calculate M.I of Unsymmetrical sections, we will find the difference. Eg. L-Sections, Double-I Star sections etc.
  3. Its not like that always axis perpendicular to depth is major axis.
Regards,

Ramakanth.K

Thank you very much for the very detailed help!
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