Slab directly supported on columns without beams are called Flat slabs or flat plates.
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Followings are the difference between Flat slab and Flat plate slab:
| Serial No. | Flat Slab | Flat Plate Slab |
| 1 | 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. |
| 2 | Flat slabs can bridge larger spans because of higher shear capacity & deflection control. | Flat slabs can bridge smaller spans because of lower shear capacity & deflection control. |
| 3 | According to MacGregor and Whites book, mechanics and design of reinforced concrete Structures, flat slabs can be used easily for spans upto 30 ft [upto 9 m] | 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] |
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