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Intro Level Question -- Truss Analysis

  1. Dec 5, 2015 #1
    1. The problem statement, all variables and given/known data
    http://puu.sh/lKP9T/b6aea483b5.png [Broken]
    http://puu.sh/lKPdk/a99777477e.png [Broken]
    http://puu.sh/lKPkj/a9f199e959.jpg [Broken]

    My question is the last picture/slide which says F_DB = F_DA how? why is that?

    2. Relevant equations
    F_DB = F_DA ?????

    3. The attempt at a solution
     
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Dec 5, 2015 #2

    SteamKing

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    Since the reaction Cx = 0, what does this tell you about the horizontal force in member AB?
     
  4. Dec 6, 2015 #3
    Its going to be completely dependent on the 2000lb and 1000lb forces at A and B.
     
  5. Dec 6, 2015 #4

    SteamKing

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    Those are vertical loads. How can they influence what happens in the horizontal direction?
     
  6. Dec 6, 2015 #5
    I was thinking of it, that they wont have any components in x. Ah. So the entire 2000lb load is distributed along AD. And the entire 1000lb load is distributed along BD and BE.
     
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