Slab directly supported on columns( without beams or beams only at the perimeter of the building) are called Flat slabs or flat plates.

What is the Difference between flat slab and flat plate?

Flat slab is one with either drop panel or column capital(or both at the same time) that helps reduce shear stress on the column slab junction. On the other hand flat plates are slabs systems with the slab connected to the column directly.

Flat slabs can bridge larger spans when compared to flat plates. Due to shear demand and deflection requirement the span flat plates can bridge is very small. According to macgregor and whites book, mechanics and design of reinforced concrete Structures, flat plates are most economical for spans from 15 to 20ft [4.5 to 6 m] and flat slabs are used for spans of 20 to 30 ft[6 to 9 m].

Flat slab or plates can be analyzed using several methods of structural analysis. Some of these methods are:

✅DDM(direct design method),

✅EFM(equivalent frame method),

✅FEM(finite element method),

✅Grillage method,

✅Yeild line method and

✅Strip method of analysis.

@engineer03

🏫🗼🏟️ Unit Weight Of Building Materials:
✍Water- 1000 Kg/ m3
✍Bricks (broken) - 1420 Kg/ m3
✍Bricks(common) -1600 Kg/ m3
✍Cement(ordinary)- 1440 Kg/ m3
✍Cement (rapid hardening)- 1250 Kg/ m3
✍Cement Mortar - 2000 Kg/ m3
✍Cement Concrete (Plain) - 2400 Kg/ m3
✍Cement Concrete (Reinforced) -2500 Kg/ m3
✍Glass - 2500 Kg/ m3
✍Lime Concrete - 1900 Kg/ m3
✍Cement Plaster - 2000 Kg/ m3
✍Lime Plaster - 1700 Kg/ m3
✍Stones (Ballast) - 1720 Kg/ m3
✍Stones (Aggregates)- 1750 Kg/ m3
✍Stones (Basalt)- 2850 Kg/ m3
✍Stones (Granite) - 2450 Kg/ m3
✍Stones (Marble)- 2650 Kg/ m3
✍Timber (Oak, Sal) - 510 Kg/ m3
✍Timber (Mango) - 650 Kg/ m3
✍Timber (Teak)- 625 Kg/ m3
✍Coal- 600 Kg/ m3
✍ Plastics- 1250 Kg/ m3
✍Oils- 800 Kg/ m3
✍Ashes- 650 Kg/ m3
✍Clinker- 750 Kg/ m3
✍Rubber- 1300 Kg/ m3
✍Slag- 1500 Kg/ m3
✍Clay Soil- 1900 Kg/ m3
✍Sand (dry) - 1540 to 1600 Kg/ m3
✍Sand (wet)- 1760 to 2000 Kg/ m3
✍Steel- 7850 Kg/ m3
✍Chalk- 2100 Kg/ m3
✍Bitumen- 1040 Kg/ m3

Join now here
👇👇👇
@engineer03
@engineer03
@engineer03

Footing