The slab type suitable for the structure you are modeling is selected.

Beam-and-slab structures = It refers to the plate system in which the stories are supported by the beams.

Waffle slabs = It refers to the two-direction toothed slab systems defined by the waffle object in the program or the waffle systems defined by the beam-slab in two directions.

One way ribbed slab = Refers to one direction threaded slab systems defined with the rib object in the program.

Flat slab = It refers to the plate systems that are formed with shearwalls and/or columns and do not contain beams.