Help understanding how to determine Compress or Tension in Truss

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SUMMARY

The discussion focuses on determining whether members of a truss are in compression or tension, specifically in a small square truss supported by a pin joint at I and a roller at A. The method of joints is emphasized as a primary technique for analyzing truss members. Participants confirm that starting from the free end, where external forces are applied, allows for a systematic approach to labeling members as zero-force (Z), compression (C), or tension (T). The example provided indicates that member DE is in compression while member EF is in tension.

PREREQUISITES
  • Understanding of truss structures and their components
  • Familiarity with the method of joints for truss analysis
  • Basic knowledge of static equilibrium principles
  • Ability to interpret free-body diagrams
NEXT STEPS
  • Study the method of joints in-depth for truss analysis
  • Learn how to identify zero-force members in trusses
  • Practice drawing and interpreting free-body diagrams for various truss configurations
  • Explore advanced topics in structural analysis, such as the method of sections
USEFUL FOR

Engineering students, structural analysts, and anyone preparing for exams in statics or structural engineering will benefit from this discussion.

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Homework Statement



A small square truss shown is supported by a pin joint at I and a roller at A. Label all members of the
truss by Z (for zero force member), C (for compression) or T (for tension).

33mo31k.png


Homework Equations





The Attempt at a Solution



So this was an exam question on a past test and I have troubles understanding how to calculate this in a fast manner.

I usually just use method of joints for each member and determine it that way. But I don't know how to determine tension/compression by looking at a truss. I've asked a couple people but I never understand what they mean...

What is your guy's approach/thought process when solving this problem?

My next exam is coming soon and I really hope to get a better understanding of this!

Thank you very much.
 
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Start at the free end, point E, where the 100 N force is applied. What do you get for members DE and EF?
 
DE is compression and therefore EF is in tension
 
Good. Now work back towards the wall.
 

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