Finding Forces in Member AE & AB: Exam Follow-up

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SUMMARY

The discussion focuses on determining the forces in members AE and AB of a truss structure, specifically addressing the tension and compression states of these members. The participant identifies a misunderstanding regarding the reaction forces at pin support A, concluding that there is no horizontal component (Ax) due to the absence of friction. Additionally, the participant corrects their earlier mistake regarding the sign of force Fcd, which impacts the overall calculations. This highlights the importance of accurately assessing reaction forces in structural analysis.

PREREQUISITES
  • Understanding of static equilibrium principles in truss analysis
  • Familiarity with methods of joints and sections in structural engineering
  • Knowledge of tension and compression forces in structural members
  • Proficiency in using free body diagrams for force analysis
NEXT STEPS
  • Review the method of joints for truss analysis
  • Study the implications of reaction forces in pin-supported structures
  • Learn about the significance of sign conventions in force calculations
  • Explore advanced topics in structural stability and dynamics
USEFUL FOR

Students in civil or mechanical engineering, structural analysts, and anyone involved in truss design and analysis will benefit from this discussion.

Ricardo Moreno
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Homework Statement


Determine all member forces and state if they are in tension or compression, in particular I am looking for member AE and AB[/B]
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Homework Equations

The Attempt at a Solution


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Ok so we are supposed to redo the problems from our exam, only I can't figure out how to find the forces in member AE and AB. I am wondering if my teacher made a mistake in correcting mine...

Also is it correct that there is no x component to the reaction force at A? The pin support is not bolted to the ground and we don't use friction in these problems so I did not add an Ax force. However now that I think about it, wouldn't this mean that the truss is moving? If there is an Ax force wouldn't that change the rest of my answers that were marked as correct?
 
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I figured out my mistake Fcd should be negative from diagram C. This changes some of the rest of the answers, it looks like my teacher didn't mark me off for having the sign wrong but in any case I've figured it out.
 

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