Determining compression or tension in truss members quickly

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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.
 

Discussion

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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.