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another beam statics ?
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Posted by: docntye

11/17/2004, 19:27:21

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Hey you all. Im trying to calculate moment of inertia for a piece of hollow 2 x 2 square inch tubing, 1/8" wall.  Its being treated as a simple supported beam in the instance with a distributed load. Can I still use I=(bh^3)/12.  Any help would be appreciated.

Thanks







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Re: another beam statics ?
Re: another beam statics ? -- docntye Post Reply Top of thread Forum
Posted by: docntye

11/18/2004, 18:39:43

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Im not understanding what it means when it asks for,"distance to neutral axis/plane z" on the beam calculators?

 

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Re: another beam statics ?
Re: another beam statics ? -- docntye Post Reply Top of thread Forum
Posted by: Cragyon

11/18/2004, 10:19:57

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I believe the eqaution is  I=(A^4 - B^4)/12 where H = heigth outside and B = heigth inside.

or I=(bh^3)/12 - (bh^3)/12 or bh outside - bh inside

They have a calculator here at http://www.engineersedge.com/calculators/section_square_case_4.htm

 






Modified by Cragyon at Thu, Nov 18, 2004, 10:26:17

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Re: another beam statics ?
Re: Re: another beam statics ? -- Cragyon Post Reply Top of thread Forum
Posted by: devitg

11/18/2004, 22:13:20

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Inertia moment of the rectangular shape is b * h^3 /12 ,

where [b] is the size perpendicular to the load

and [h] the size colinear with the load

, when the shape is hollow you have to substrac the hole from the whole

So for a square   wher both size are the same a=b=h

I moment = a * a^3/12 =a^4/12

About the distance from the neutral axis , in this case is a/2.

this distance is used to calc what is call the resistent module [W]

 

 

 

 







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