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Axial stress of a beam

  1. May 6, 2007 #1
    I've got a sectional area of a beam that is subjected to an axial force N = -100 and momenst M(y) = -50 kNm and M(z)= - 120 kNm. I've found the centroid and the second moment of area around both axes.

    How can I compute the maximum axial stress?

    Here's the section: http://www.badongo.com/pic/624173

    I got the correct answer after trying Naviers formula several times:

    Max stress = N/A + (M(z)*y(max))/I(z) + (M(y)*z(maks))/I(z)

    What I don't understand is: Why is y(maks)=124 and not 151??
    Last edited by a moderator: Apr 22, 2017
  2. jcsd
  3. May 6, 2007 #2


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    Well, if you got the correct answer, you should ask yourself what ymax and zmax represent in your formula and compare them with your results.
  4. May 6, 2007 #3


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    Look at the stress distributions diagrams.
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