[Karamba] Bending diagram

Hi everyone!

I am currently interested in bending of plates with different support conditions. I would like to draw with Karamba both bending moment on a plate (m,x and m,y in kN.m/lm).

"Plate_4corner supported_mx.png" shows the results I would like to have for m,x with a 4 corner supported plate.

My problem is that Karamba only gives bending moments in principal spatial system (m1 and m2). In order to have mx, I did the crossprod with unit vector x:

m,x = m1 . u,x + m2 . u,x

m,y = m1 . u,y + m2 . u,y

The results are not what I expect and I don't understand why, maybe there is something I am missing?

Thank you very much!