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Finding the forces of a truss

  1. Dec 18, 2011 #1
    1. The problem statement, all variables and given/known data

    i am trying to figure out the forces of the different members of this truss in which looks like a a square that is split into two triangles and is affixed to another triangle the same size I have already found the moment of the reactions and already found the reaction forces as well.







    Code (Text):
      A -500lbf  C -500lbf

                                  2ft           2ft
                                --------l----------- l Pin Reaction E
                                  \         l          /     l
                                    \       l        /       l   2ft
                                      \     l      /         l
                                        \   l    /           l
                                          \ l  /---------l Roller reaction D
                                            B
    2. Relevant equations
    sin
    cos
    tan
    Efx=0
    Efy=0
    Em=0

    3. The attempt at a solution
    more or less it is a question about the method of joints but im not exactly sure how you do it. Also the triangles are all 45° 45° and 90°
     
    Last edited: Dec 18, 2011
  2. jcsd
  3. Dec 18, 2011 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    It is not clear, is your truss is made of 4 straight pieces, or 7? To what do the lbf refer?

    If you wish to use ASCII art (and I don't recommend it), then you must include it within [code] [/code] pair. Otherwise the forum software squashes strings of spaces into a single space. You'll find it easiest if you also use Courier fixed-size font.
    Code (Text):
     [font="courier new"]
                           |
    -----------------------|
    \          |          /|
      \        |        /  |
        \      |      /    |
          \    |    /      |
            \  |  /        |
              \|/          |
    -----------------------'
                                       [/font]
     
  4. Dec 18, 2011 #3
    thank you and your picture is pretty much accurate without that line extending after B though
     
  5. Dec 18, 2011 #4

    NascentOxygen

    User Avatar

    Staff: Mentor

    Point B is unsupported and in mid-air, is it?

    What and where are points A and C?
     
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