Help understanding how to determine Compress or Tension in Truss

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AI Thread Summary
To determine whether members of a truss are in compression or tension, start analyzing from the free end where external forces are applied. For example, in the given truss, member DE is identified as being in compression, which indicates that member EF is in tension. The method of joints is commonly used to assess each member, but understanding the force flow from the applied loads can expedite the process. It's important to visualize how forces are transmitted through the truss to accurately label each member. Mastering this approach will enhance understanding and performance in upcoming exams.
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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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