Thank you Peter for your answer. I had turned on NLGEOM in my analysis.
I used CTE*(T1-T0)*L1+L1 to calculate the length after applying temperature and I presented the result in the second paragraph which are (2528 and 3009 mm).
The question is here:
Shouldn't these two formulas below give us the same result? I think they have to be same!
LL1 = CTE*(T1-T0)*L1+L1 (According to thermal strain)
and
LL1=sqrt(((nx(1)-(nx(4)+ux(4)))**2)+((ny(1)-(ny(4)+uy(4)))**2)) (According to node's final position)
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