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Truss Analysis

  1. Nov 17, 2008 #1
    1. The problem statement, all variables and given/known data
    Determine the forces in each member of the truss shown. Also find the values for any reactant forces

    [​IMG]

    2. Relevant equations

    Fx= 0
    Fy= 0

    3. The attempt at a solution

    I set θ in the corner of J1
    tan θ=12/16
    θ = tan-1 12/16
    θ = 36.87

    I set Φ in the corner of J3
    tan Φ = 12/9
    Φ = tan-1 12/9
    Φ = 53.13

    This is where I began to falter. I could not figure out how to diagram everything out. If someone could just at least give me a diagram of where things are supposed to go, I can sum up the x and y forces by myself. This is pretty urgent, and I was absent for this class so my only help is messy notes from another student. This isn't in my textbook. Any help will be appreciated.
     
  2. jcsd
  3. Nov 17, 2008 #2
    You want to resolve the forces. If a force [tex]F[/tex] makes an angle [tex]\theta[/tex] with the horizontal, the horizontal force is [tex]F_x=Fcos\theta[/tex] and the vertical force is [tex]F_y=Fsin\theta[/tex].

    Give us something to work on and we'll lead you on.
     
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