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Column problem help

  1. Aug 16, 2006 #1
    A straight conical column made of steal (original length 1000mm, head diameter 90 mm, ground diameter 190 mm) is loaded by a normal force F = 1450 kN. What is the length under load ?

    for this ,the diameter is changing along the column,should i assume is as hollow and use the hollow formula for the area or any other ways??
  2. jcsd
  3. Aug 16, 2006 #2
    i get (force/E) (1/A(x)) dx = d(strain)

    then i integrate to get (F/E) ln[(pi*d^2)/4] = deformed length - original lengh

    am i correct??
  4. Aug 17, 2006 #3
    When you say normal force, what do you mean? Axial or normal to the member? If it is axial, then yes, you have to integrate.
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