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jo
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Join Date: Dec 2011
Posts: 3

Hollow Circular Shafts Under Compression

12/23/2011 2:16 PM

hey guys;

i am doing an assignment on steel columns, my question is:

- i have to evaluate the section capacity of a hollow circular cross section, should i use the gross area or net area in my calculs ? also same issue with second moment of inertia...

your response is much appreciated !

Cheers and amerry xmass+ happy new year...etc
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Tornado
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Join Date: May 2009
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#1

Re: Hollow Circular Shafts Under Compression

12/23/2011 6:36 PM

Net.

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CaptMoosie
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#2

Re: Hollow Circular Shafts Under Compression

12/24/2011 10:15 AM

Tornado is quite correct. Use the Net Area (in.^2), Moment of Inertia (in.^4), and Radius of Gyration (in.) in the calculations. These values are tabulated in the Steel Manual or steel manufacturer's literature.

Q: You do know how to use the AISC Steel Manual, don't you?

Note: Not to confuse things (and other issues), but you only use the Gross Area (etc.) if the interior void of a round, square or rectangular steel column is filled with a suitable concrete mix, then the entire section becomes a "Transformed Composite Section".

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lyn
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Join Date: Oct 2008
Posts: 42355
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#3

Re: Hollow Circular Shafts Under Compression

12/25/2011 4:38 AM

Can't help you. I can never seem to get beyond the first moment of inertia.
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jo
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Join Date: Dec 2011
Posts: 3
#4

Re: Hollow Circular Shafts Under Compression

12/25/2011 8:58 AM

thank you all :), it felt like a stupid Q but i was abit confused !, well i know how to use the eurocode which is most relevant to me :P, thanks again :)
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