Finding Forces in Truss Members for Solving Truss Problems

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SUMMARY

The discussion focuses on solving truss problems by finding forces in truss members FG, EG, and CH using the method of sections. The external forces were identified as Ax = 0, Ay = 8 kN, Jy = 8 kN, and P = -16 kN. The moment about point G was calculated to find CH = 14.66 kN. Participants emphasized the importance of identifying zero-load members and suggested taking moments about point A to simplify calculations for FG and EG.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with truss analysis methods, specifically the method of sections
  • Knowledge of force summation in two dimensions
  • Ability to calculate moments about a point
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  • Study the method of sections in truss analysis
  • Learn how to identify zero-load members in trusses
  • Practice calculating moments about various points in truss systems
  • Explore advanced truss analysis software tools for complex structures
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Engineering students, structural engineers, and anyone involved in analyzing truss structures and solving static equilibrium problems.

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Homework Statement



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Homework Equations

The Attempt at a Solution


First i Found the external forces. Ax =0 , Ay = 8Kn, Jy=8Kn and P = -16Kn
Then i took moment about point G to eliminate FH and EG and so was able to find CH = 14.66Kn.

I am kind of stuck on how to tackle the problem further. Where should i take moment in order to find either FG or EG. Any help is appreciated. Thanks in advance!
 
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It's been a long time since I've done these - but if you take the moment about A, forces CH and FG will disappear, and all you will be left with is EG and P... right? I was never good at the method of sections, although it can save you a bunch of time.
 
First, identify the zero-load members.
 
insightful said:
First, identify the zero-load members.
Scratch that. You are asked for the forces in FG, EG, and CH, so cut your plane through those 3 members and sum X and Y forces and moments. You did moments to get CH, so now write the X and Y equations for your section.
 

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