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Homework Help: Finding displacement at a point in truss

  1. Jan 11, 2017 #1
    1. The problem statement, all variables and given/known data
    For the circled part , how to get the +1.33 , -1.67 , +1 ??? What are they ? Are they the µ ?

    2. Relevant equations

    3. The attempt at a solution
    What is µ ? How to get the value ? It's not stated in my book though

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  2. jcsd
  3. Jan 11, 2017 #2


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    I would be surprised if it wasn't stated in your book. Your attempt is a question, not an attempt. The value of u is the dimensionless ''force' in each member when a unit load of 1 (dimensionless) is applied at the given joint in the direction of the displacement you want to calculate for that joint. You should now make an attempt to understand the given solution.
  4. Jan 12, 2017 #3
    The method used here is the virtual work method for trusses and mu are the internal force in each member due to a unit load of 1 applied at point E.
    Positive values indicate that the member is under tension forces, negative under compression forces
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