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  1. #1
    Join Date
    Jan 2005
    Posts
    183

    steel coulmns loading

    Is there a table or calculations for figuring out how much weight a column can tolerate?

    Lets say 4' piece of 2" square tube 1/8" wall thickness, how much weight can be applied before it starts to deflect?

  2. #2
    Join Date
    Dec 2004
    Posts
    86
    .0000000000000000000000001lb.

    Any load will deflect the beam, its just a matter of how much.

  3. #3
    Join Date
    May 2003
    Posts
    550
    Look up Euler's Formula. Basically the critical buckling load (beyond elastic limit) for a vertical column is;

    Fcr=(ExIxPi^2)/L^2

    Where;
    Fcr=critical force or load,
    E=youngs modulus for material,
    I = area moment of inertia of the horizontal cross section
    L= column length

    note that critical load decreases with the square of the column length

    L used in the formula changes depending on how the ends of the column are terminated. There's a table somewhere but if the ends are clamped solid then L = 0.5 x actual length. If they're free to float it's 2.0 x actual length and various permutations in between.

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