Simple Statics Question: Truss Structure

  • #1
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Homework Statement


fPO1U5I.png



Homework Equations


∑M = 0, ∑Fx = 0, ∑FY = 0

The Attempt at a Solution


QbIz4Sq.png


If so,

p9oacDR.png

If so, I will be using the method of sections to cut along the red line as indicated in the picture.

This gives me 3 equations of equilibrium as shown above. However, before solving these equations i first need to check whether my equations/diagrams are contain all the forces necessary.

I know that there is a support reaction in the Y direction of magnitude W at point A.
However, where do I put the support reaction in the x direction? From what I understand there needs to be a support reaction in the X direction as there is a moment generated from the W down and the W up.
 

Answers and Replies

  • #2
PhanthomJay
Science Advisor
Homework Helper
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If you assume that ED is a zero force member, the truss will be unstable because it will only have one pinned support at A, and rotate clockwise toward the ground, taking the engine along with it. So this is an incorrect assumption. Instead, consider ED as a '2 force' member anchored at E.
 

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