As per Flat Slab/Plate or Waffle Slab, but where masonry or concrete infills provide lateral stability. For this type of lateral load-resisting system the infills are located between columns, otherwise the system should be described as Wall.

LFLSINF_-_Charleson_1
A simplified drawing of an infilled flat slab / plate or infilled waffle slab structure (adapted from: A. Charleson, Seismic Design for Architects, Architectural Press 2008, p. 64, Fig. 5.2)

LFSLINF_Allen&Brzev_1

Partial section of an infilled flat plate structure

LFLS_Allen&Brzev_2

Diagram showing examples of flat plate and flat slabs