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Beam Bending, beyond the basics, a little

  1. Nov 24, 2009 #1
    Ok, I am fairly comfortable with beam bending equasions for simple rectangles. However, I am totally confused on how to approach other cross sections... like a channel can someone help? Or point me to a good online instructional resource? I have googled all I can think of...


    -Mark
     
  2. jcsd
  3. Nov 24, 2009 #2

    FredGarvin

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    What else are you changing other than the cross sectional MOI?
     
  4. Nov 24, 2009 #3

    Mech_Engineer

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    For simple beam bending calculations, all you have to do is calculate the MOI for the section. Whether its an I-beam or a circular tube, all of the beam equations are the same (although some stress distributions may change).
     
  5. Nov 25, 2009 #4
    Thanks! I must have been over thinking it. I was sort of approaching it as taking each side of the tube, and top and bottom, calculating MOI for each...and adding them together. Thanks for the help!

    Great forum!

    -Mark
     
  6. Nov 25, 2009 #5

    Mech_Engineer

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    That's pretty close to how you would calculate the MOI, see here: http://en.wikipedia.org/wiki/Second_moment_of_area

    ...but for common cross-sections like an I-beam, formulas for it's section properties have already been calculated in detail, you just have to find them. Here is one resource: http://www.efunda.com/math/areas/Common_Cross_Section_Index.cfm
     
  7. Nov 25, 2009 #6
    Thanks again!
     
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