How far can a flat slab span?
The answer to question is simple, the limit to span is about 6–15m depending upon how much you spend because as the length increases depth of slab increases since bending moment is increasing and the structure will become more and more uneconomical. Also drop panel size increases for gradual transfer of load.
What is the maximum span of a slab?
Examples of slab thickness and indication of maximum span for solid slabs with ordinary ( ) and prestressed ( ) reinforcement according to . The allowed recommended span lengths for continuous slabs are equal to 13.6m for two-way slabs and to 12.5m for unidirectional slabs.
How long can a concrete slab span?
Reinforced concrete allows a wide range of structural options and provides cost-effective solutions for a multitude of situations—from residential buildings with moderate live loads and spans of about 25 ft, to commercial buildings with heavier live loads and spans ranging from 40 ft to 50 ft and beyond.
What is the span of a slab?
The distance between the centers of support, or the clear distance between supports plus the effective depth of the beam or slab, the lesser value being taken.
Why have a flat slab?
Flat slabs allows Architect to introduce partition walls anywhere required, this allows owner to change the size of room layout. Use of flat slab allows choice of omitting false ceiling and finish soffit of slab with skim coating.
What is the minimum thickness of slab?
Minimum thickness of slab Minimum thickness of rcc slab is 4″ or 100mm, 3″ for side walk, 4″ for patios, 6″ for driveway and minimum 4″ thick for parking. It will be restricted to 4 times the nominal size of aggregate.
What are the disadvantages of flat slab?
Disadvantages of Flat Slab
- It has span limitations.
- They are not suitable for masonry partition of brittle nature.
- It uses drop panels that may interfere with oversized mechanical ducting.
- They have middle strip deflection, which may be critical.
- They have more thickness as compared to typical RCC Slabs.
Is flat slab economical?
Flat slab structure is more economical than that of conventional slab structure. The cost of flat slab structure is reduced by 15.8% compared to conventional slab structures. Flat slab structures are the best solution for high rise structure as compared to conventional slab structure.
Where are flat slabs used?
Flat slabs are mostly used in large industrial structures, parking garages, ramps, warehouses, tall buildings, and hotels. They are used where the beam is not required. These slabs also used where the structures require less formwork.
What should the span of a slab be?
6. Flat slab design should be based on the longer panel dimension. 7. For slabs over 10m, ratios should be reduced by the factor √ (10/span in metres). Cantilevers over 4m should be justified by calculation. 8. Intermediate values may be interpolated.
When to use a flat slab in a building?
Flat slab is used when column and beam in the structure is undesirable like in cinema Hall when you look around there will be no beams or column. You can consider it as beam with breadth more than 1m directly resting on column.
What’s the maximum span for a 300 HC slab?
Unless your loads are high, you can easily do 12m with 300 HC slabs. RE: Flat slab maximum span allowed? Staad gives short term uncracked deflections. Multiply them by about 6 to get realistic long term deflections. I will not go into my usual rant about understanding the design area and the software you are using.
How to calculate the thickness of a flat slab?
Solution : Thickness : Since Fe 415 steel is used and drop is provided, maximum span to thickness ratio permitted is 32 Thickness of flat slab = 6000 32 = 187.5 mm Provide 190 mm thickness. Let the cover be 30 mm Overall thickness D = 220 mm Let the drop be 50 mm. Hence at column head, d = 240 mm and D = 270 mm 13.