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Homework Help: Truss help

  1. Sep 15, 2008 #1
    The space truss showin has compression and tension forces acting in the members as shown.


    Force F is 10kN, determine the three unknown forces (F1, F2 and F3).

    I know that it should be the summation of Fx, Fy and Fz, however for F1, there is no reaction force, so I don't know what to do.

    Can somebody please help?
  2. jcsd
  3. Sep 15, 2008 #2
    Attach A & B to a vertical wall.
    What force is needed directly on the wall at the level of F3 to stop the wall from being pulled over by F.
  4. Sep 15, 2008 #3
    so the x component of F1 would be supported by the wall??
  5. Sep 17, 2008 #4
    bump ?
  6. Sep 17, 2008 #5


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    I'm not too good looking at 3D, but something appears wrong with your picture. There appears to be no way for the x component of the F1 force to be balanced at the joint, since the other 3 members all lie in the yz plane, unless the picture is misleading or incomplete?
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