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Compatibility Equations

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1. Compatibility Equations
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Hi, I have been working on a question for 3 hours now and keep getting the signs wrong in my final answer. I can now see why, but I don't understand it. Basically, the question is to do with working out the displacement of a node in a truss structure when one of the bars is subjected to a temperature change.

The crux of the problem is that I have the following contradiction when finding the bar force:

Method 1:

Method 2:

As you can see, there is a difference in sign when comparing the final answer from both methods. Can someone tell me what's the problem here?

Nevermind, got it.
Last edited by ViralRiver; 09-04-2012 at 20:15. Reason: Solved it.
2. Compatibility Equations
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Last updated: April 15, 2012
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