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Help understanding how to determine Compress or Tension in Truss

  1. Nov 28, 2013 #1
    1. The problem statement, all variables and given/known data

    A small square truss shown is supported by a pin joint at I and a roller at A. Label all members of the
    truss by Z (for zero force member), C (for compression) or T (for tension).

    33mo31k.png

    2. Relevant equations



    3. The attempt at a solution

    So this was an exam question on a past test and I have troubles understanding how to calculate this in a fast manner.

    I usually just use method of joints for each member and determine it that way. But I don't know how to determine tension/compression by looking at a truss. I've asked a couple people but I never understand what they mean...

    What is your guy's approach/thought process when solving this problem?

    My next exam is coming soon and I really hope to get a better understanding of this!!

    Thank you very much.
     
  2. jcsd
  3. Nov 28, 2013 #2

    SteamKing

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    Start at the free end, point E, where the 100 N force is applied. What do you get for members DE and EF?
     
  4. Nov 28, 2013 #3
    DE is compression and therfore EF is in tension
     
  5. Nov 28, 2013 #4

    SteamKing

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    Good. Now work back towards the wall.
     
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