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Section modulus

  1. Dec 17, 2013 #1
    1. The problem statement, all variables and given/known data

    I want to know the section modulus for a beam which has a UDL of 13.5 kn/m across 10 metres. Its simply supported at both ends. max allowable stress = 255 MPa

    2. Relevant equations

    Z= M / max allowable stress [cm^3]


    3. The attempt at a solution

    max bending moment = 13.5 x 10 ^2 / 8 = 168.75 kn/m

    168.75 x 10^3 / 255 x 10^6 = 6.617647059 x 10 ^ -4 = 661 cm^3

    Thanks,
    Josh
     
  2. jcsd
  3. Dec 17, 2013 #2

    SteamKing

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    The section modulus is a property of the geometry of the beam's cross-sectional area. What you are calculating is the minimum section modulus which a candidate beam must have in order keep the bending stresses below the max. allowable stress.
     
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