Slab Analogy

When the slab bends as shown before, its top edge (surface) is subjected to compression forces and its bottom surface resists tension forces.

The behavior of flat double layer grids (FDLGs) under loads can be analogous to two-way slabs with the top layer members in compression and the bottom layer members in tension. This is called “slab or plate analogy”.

Note that when the slab is subjected to loads it deflects due to bending moment. This bending moment can be resolved as a compression force acting on the top layer and a tensile force acting on the bottom layer of the FDLG. This is the basis for the “slab analogy”.

Note that in this method, the effects of bracing and vertical members are ignored.

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