Which type of slab is reinforced in two directions with beams on the sides?

A two-way slab and beam system is designed to carry loads in two directions, typically supported by beams on all four sides. This type of slab distributes loads more efficiently compared to a one-way slab, which primarily supports loads in one direction between two parallel supports.

In two-way slabs, the reinforcement is placed in both directions, enabling them to effectively handle the bending moments arising from applied loads, which leads to enhanced structural integrity and performance. This system is ideal for areas where load distribution is required over a larger space without the constraint of support only at the edges, making it suitable for a wide variety of architectural applications.

Flat plate slabs, while resembling a two-way slab, typically do not use beams and are instead supported by columns directly, which does limit their overall load distribution capabilities. Waffle slabs involve a two-way slab design but with a grid of beams forming a pattern that allows for reduced use of concrete, primarily in certain design applications. Thus, the designation of a two-way slab with beams clearly identifies its functionality and structural benefits within the defined context.