penpal97
Structural
- Jul 6, 2006
- 49
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.
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.
