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Simply supported beam/plate

Simply supported beam/plate

Simply supported beam/plate

(OP)
I have modeled a simply supported beam 10' long, 5kip point/line load at midspan.  Midspan moment = 12.5k-ft.  For a 1ft thick concrete slab (and assuming no cracking), there should be ~500psi compression on top, ~500psi tension on the bottom.

I run the model and good results for principal major stresses in compression and tension (pg 3 and pg 4).  I get ~zero psi for principal minor stress in the bottom (pg 5).

Why is there 500psi of tension in the principal minor direction at the top (pg 2)?  I would expect there to be ~0psi on the top, just like the bottom.

For full disclosure, I modeled the beam on the 45degree line, not along the x-axis, because I have to do some other modeling later on.  Meaning the beam goes from 0,0 to 1,1 to 2,2 to 3,3 etc. I do not think the element orientation should affect its results though.  

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