Truss Analysis

  • Thread starter rikka22
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  • #1
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Homework Statement


Determine the forces in each member of the truss shown. Also find the values for any reactant forces

http://img201.imageshack.us/img201/6853/trussnu9.jpg [Broken]

Homework Equations



Fx= 0
Fy= 0

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.
 
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Answers and Replies

  • #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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