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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 Author Profile Mail author Edit

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

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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 Author Profile Mail author Edit

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 /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 Author Profile Mail author Edit

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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