Hogging moment in one corner of slab

[ashley_calleja]

I am modelling a RC Slab pinned on all 4 sides, and I am getting a hogging moment in one corner and I can't seem to figure out from where it is being caused. Do you have some suggestions on how to solve this issue? I have attached the model for reference. Thank you.

[Rafacascudo]

Looks good to me .

Read here 

https://forums.autodesk.com/t5/robot-structural-analysis-forum/slab-causing-hogging-moments-in-simpl...

The full Uz support(both directions) is the source of the problem. Apply a Uz unidirectional(Uplift) support instead and the hogging moment will disappear.