flat slab design| flat slab reinforcement details | flat slab details
flat slab design| flat slab reinforcement details |flat slab details
INTRODUCTION- FLAT SLAB DESIGN
Flat slabs system of construction is one in which the beams are used in the conventional methods of construction. The slab is directly supported on the column and load from the slab is directly transferred to the columns and to the foundation. To support heavy loads the thickness of the Flat slab near the support with the column is increased to withstand load and these are called drops, or columns are generally provided with enlarged heads called column heads or capitals.
- Column strip
- Middle strip
- Panel
- column head
DESIGN PROCEDURE - FLAT SLAB DESIGN
1. Determine design life
2. Assess actions on the slab
3. Determine which combinations of actions apply
4. Determine loading arrangements
5. Assess durability requirements and determine concrete strength
6. Check cover requirements for appropriate fire resistance period
7. Calculate min. cover for durability, fire and bond requirements
8. Analyse structure to obtain critical moments and shear forces
9. Design flexural reinforcement
10 . Check for deflection
11 .Check punching shear capacity
12 .Check spacing of bars
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Drop of flat slabs:
Where a drop panel is used to reduce the amount of negative moment reinforcement over the column of a flat slab, the size of the drop panel shall be in accordance with the following:
- Drop panel shall extend in each direction from the centerline of support a distance not less than one-sixth the span length measured from centre-to center of supports in that direction.
- Projection of drop panel below the slab shall be at least one-quarter the slab thickness beyond the drop.
- In computing required slab reinforcement, the thickness of the drop panel below the slab shall not be assumed greater than one-quarter the distance from the edge of the drop panel to the edge of column or column capital
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DESIGN METHODOLOGY
There must be a minimum of 3 continuous spans in each direction.
- Panels shall be rectangular with a ratio of longer to shorter spans, centre to centre of supports, not greater than 2.Successive span lengths, centre-to-centre of supports, in each direction, shall not differ by more than 1/3 of the longer spans.
- Columns may be offsets a maximum of 10% of the span (in direction o offset)from either axis between centre lines of successive columns.
- All loads shall be due to gravity only and uniformly distributed over entire panels. the live loads shall not exceed 2 times the dead load.
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