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Difference Between Flat Slab & Conventional Slab-Beam System

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The main difference between flat slab & conventional slab-beam system is that the one is directly supported on the column while another system has a beam for support.  The load is transferred directly from slab to column in the flat slab. In conventional slab-beam system, the load is transferred from slab to beam and ultimately beam to the column.

Flat Slab System

01

Flat Slab System

  • In a flat slab system, the floor/roof consists of walls/slabs and there are no beams.

Slab Beam System

  • In a slab-beam system, the floor/roof consists of beam and slab.

02

Flat Slab System

  • In flat slab system, the thickness of slab is large.

Slab Beam System

  • In slab beam system, the thickness of slab is small while depth of beam is large.

03

Flat Slab System

  • It provides greater clear ceiling heights.

Slab Beam System

  • It provides lesser clear ceiling heights.

04

Flat Slab System

  • Here load from slab is directly transferred to column.

Slab Beam System

  • Here load from slab is transferred to beam and from beam to column.

05

Flat Slab System

  • In flat slab system, less formwork is needed.

Slab Beam System

  • In slab beam system, more formwork is needed.

06

Flat Slab System

  • Form work is simple and hence not costly.

Slab Beam System

  • Form work is complicated and hence costly.

07

Flat Slab System

  • Drop panel is provided above column.

Slab Beam System

  • Drop panel is not needed above column.

08

Flat Slab System

  • Floor system requires lesser depth and hence there will be reduction in storey height.

Slab Beam System

  • Floor system requires more depth and hence there will be increase in storey height as compared to flat slab.

09

Flat Slab System

  • Dead load of structure is less.

Slab Beam System

  • Dead load of structure is more.

10

Flat Slab System

  • In flat slab system, It is easy to install sprinkler and piping and other utilities as beams are absent.

Slab Beam System

  • In slab beam system, It is tricky to install sprinkler, piping and other utilities as beams are present.

11

Flat Slab System

  • Flat ceiling is available which gives attractive appearance.

Slab Beam System

  • Flat ceiling is not available for flat attractive appearance, you may have to do false ceiling.

12

Flat Slab System

  • Illumination is better as beams are absent.

Slab Beam System

  • Illumination is not as effective as in flat slab as beam are present.

13

Flat Slab System

  • It is easier to provide acoustical treatment underside of slab.

Slab Beam System

  • It is difficult to provide acoustical treatment underside of slab.

14

Flat Slab System

  • At least three continuous spans in each direction are needed for construction.

Slab Beam System

  • Construction of Single slab is possible.

15

Flat Slab System

  • Ratio of Longer span to shorter span should not be more than 2.2.

Slab Beam System

  • Ratio of Longer span to shorter span has no limitation.

16

Flat Slab System

  • Live load shall not exceed three times the design dead load.

Slab Beam System

  • Live load has no relation with design dead load

17

Flat Slab System

  • In flat slab system, minimum thickness of slab is 125 mm.

Slab Beam System

  • In slab beam system, minimum thickness of slab is 100 mm.

18

Flat Slab System

  • Reinforcements are commonly provided in two layers.

Slab Beam System

  • Reinforcements are commonly provided in one layer.

19

Flat Slab System

  • It is less resistant to earthquake as it is less flexible than slab beam system.

Slab Beam System

  • It is more resistant to earthquake as it is flexible than flat slab system.

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