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Zero Force Member Help!

  1. Feb 28, 2009 #1
    I need some help distinguishing the zero force member on two different trusses.

    In Figure 10.7:

    I said that Member CD and DE were zero force members. Is that right?

    In Figure 10.12:

    I said that Member AD was a zero force member? I am unsure how to find the force P as well?

    The vertical deflection at C is zero with the Area for all bars = 1.8in^2 and E= 30000 KSI

    Just need some help since I am a little stuck. Thanks!
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Mar 1, 2009 #2


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    ahennessey: On problem 10.7, your answer is correct. Nice work. Problem 10.12 is rather nontrivial. Your current answer is incorrect. You would need to list relevant equations and show your work, or list some of your answers, so we could see where (if) your math is incorrect.
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