## Forces in Truss Members (Statics)

1. The problem statement, all variables and given/known data

See attachment.
Edit: Point A is a pinned connection (has a reactionary force in X and Y direction). Point B is a roller connection (only has reactionary force in Y direction)

2. Relevant equations

Sum Fx=0
Sum Fy=0
Sum of Moments=0

3. The attempt at a solution

Find reaction forces at point A and D. Normally this wouldn't be an issue. I'd just find the reaction force of D by solving for the moment around point A. Then find A by knowing that the sum of forces in Y direction is 0. However, dimensions are not given in the problem. I have the answers, but I do not see how to get to them.

After finding reaction forces, isolate each joint and begin with joint with no more than two unknowns. Proceed until all forces are found.
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 Recognitions: Gold Member Homework Help Science Advisor These are all equilateral triangles...each horizontal member has the same length, L. What would be the perp. distance from the applied load to A?

 Quote by PhanthomJay These are all equilateral triangles...each horizontal member has the same length, L. What would be the perp. distance from the applied load to A?
3*cos(60)*L, correct?

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## Forces in Truss Members (Statics)

 Quote by cpmustang07 3*cos(60)*L, correct?
Interesting way to say 1.5L, which is correct.

 Quote by SammyS Interesting way to say 1.5L, which is correct.
No...

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