What is the correct FBD and equilibrium equations for a truss analysis?

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SUMMARY

The forum discussion centers on the correct Free Body Diagram (FBD) and equilibrium equations for truss analysis. The key equations used are ∑Fx = 0, ∑Fy = 0, and ∑M = 0. A critical error was identified in the load applied at point C, which should be 4.5 instead of 4. After correcting this typo, the user successfully achieved equilibrium at all joints within the truss.

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jegues
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Homework Statement



See figure

Homework Equations



\sum F_{x} = 0
\sum F_{y} = 0
\sum M = 0

The Attempt at a Solution



See other figure.

is the FBD for my truss correct?
 

Attachments

  • TrussQ4.16.jpg
    TrussQ4.16.jpg
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  • TrussQ4.16attempt.JPG
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jegues said:

Homework Statement



See figure

Homework Equations



\sum F_{x} = 0
\sum F_{y} = 0
\sum M = 0

The Attempt at a Solution



See other figure.

is the FBD for my truss correct?
Except for the typo error for the load applied at C (should be 4.5, not 4), your FBD is excellent, nice work.
 
Now that I'm sure my FBD diagram and equilibrium equations are correct, I moved onto the actual truss analysis and I'm still not obtaining an equilibrium at all the joints within the truss.

Can anyone help me find my error?

This has been giving me quite the headache!

Thanks again.

EDIT: Fixed my error, got everything to work out ;)
 

Attachments

  • TrussQ4.16TrussAnalysis.JPG
    TrussQ4.16TrussAnalysis.JPG
    31.3 KB · Views: 544

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