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Pls clarify my doubt

 
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isjaga
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Joined: 14 Jun 2012
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PostPosted: Sat Jun 23, 2012 6:33 pm    Post subject: Pls clarify my doubt Reply with quote

why hollow sections are better than solid sections even though they are having least moment of inertia.
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nobijacob
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Joined: 04 Feb 2012
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PostPosted: Sat Jun 23, 2012 7:31 pm    Post subject: Reply with quote

for a hollow section and solid section having same weight/m a hollow section will have higher moment of inertia.
and hence its considered more efficient.
but if you are comparing a hollow section with a solid section of the same diameter then the solid section will have more MI. but it is at the expense of excess weight.
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Dr. N. Subramanian
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PostPosted: Sun Jun 24, 2012 3:49 pm    Post subject: Re: Pls clarify my doubt Reply with quote

Dear Er Jaga,

Hollow sections are economical than solid sections for carrying axial loads as r value may be higher. For bending I sections are economical as they have more material in the flanges and less at the web.

Best wishes
NS
isjaga wrote:
why hollow sections are better than solid sections even though they are having least moment of inertia.
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vikram.jeet
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PostPosted: Mon Jun 25, 2012 9:25 am    Post subject: Pls clarify my doubt Reply with quote

Already enlightened by Dr NS Sir and Er Jacob

Main advantage in bending members is that full permissible bending compressive stress is
available contrary to channel section where it needs to be based on un-stiffened flange length
i.e. L/R
For axial the L/Rmin is generally higher and a higher permissible compressive stress
is available as compared to channel section where L/Ry is much smaller and compression  
capacity is dictated by that.

Hence for same weight , hollow section is always economical as noted by Er Jacob.

best regds

vikramjeet



why hollow sections are better than solid sections even though they are having least moment of inertia
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