I am modeling a composite bridge on ANSYS APDL.

i modeled the deck slab as a brick solid element and I had to divide it into 7 parts for the meshing to work (attached).

After meshing all elements in my model, I merged the nodes with 0.001 tolerance. 

But then I got these two errors (attached).

Unfortunately, this error affects my model connectivity as when I add my boundary conditions, the model is still considered as insufficiently restrained. 

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