Can you tell me types of slabs? And how can we design them?
Hi, Kadappa stone of 2" ( 50.8mm ) having its density in the range of 5.0 to 5.4 kg/cm^3 with a water absorption ratio of less than 2%. After calculation, you may found that at 6-meter height, it is not able to bear the weight of a 500-liter water tank. Thus, support in the middle must be provided fRead more
Hi,
Kadappa stone of 2″ ( 50.8mm ) having its density in the range of 5.0 to 5.4 kg/cm^3 with a water absorption ratio of less than 2%.
After calculation, you may found that at 6-meter height, it is not able to bear the weight of a 500-liter water tank.
Thus, support in the middle must be provided for stability and to increase the bearing strength of kadapa so that it lasts for a long duration.
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aviratdhodare
Flat slab - Flat slab is minimum 8″ or 0.2m. Slab without drop and column without column head(capital). Slab with drop and column without column head. Slab without drop and column with column head. Slab with drop and column with column head. Conventional slab - conventional slab is 4″ or 10cm. 5″ toRead more
Flat slab – Flat slab is minimum 8″ or 0.2m.
Conventional slab – conventional slab is 4″ or 10cm. 5″ to 6″ inches
Hollow core ribbed slab
Hardy slab
Waffle slab
Dome slab
Pitch roof slab
Slab with arches
Post tension slab
Pre tension Slab
Low roof slab
Projected slab
Grads Slab/ Slab on grade
Sunken Slab
a) Effective span of slab:
Effective span of slab shall be lesser of the two
1. L = clear span + d (effective depth )
2. L = Center to center distance between the support
b) Depth of slab:
The depth of slab depends on bending moment and deflection criterion. the trail depth can be obtained using:
Type of support
Simply supported
Fe-250 – L/35
Fe-415 – L/28
Continuous support
Fe-250 – L/40
Fe-415 – L/32
Or, the following thumb rules can be used:
c) Load on slab:
The load on slab comprises of Dead load, floor finish and live load. The loads are calculated per unit area (load/m2).
Dead load = D x 25 kN/m2 ( Where D is thickness of slab in m)
Floor finish (Assumed as)= 1 to 2 kN/m2
Live load (Assumed as) = 3 to 5 kN/m2 (depending on the occupancy of the building)
Detailing Requirements of RCC Slab as per IS456: 2000
a) Nominal Cover:
For Mild exposure – 20 mm
For Moderate exposure – 30 mm
However, if the diameter of bar do not exceed 12 mm, or cover may be reduced by 5 mm. Thus for main reinforcement up to 12 mm diameter bar and for mild exposure, the nominal cover is 15 mm.
b) Minimum reinforcement: The reinforcement in either direction in slab shall not be less than
c) Spacing of bars: The maximum spacing of bars shall not exceed
d) Maximum diameter of bar: The maximum diameter of bar in slab, shall not exceed D/8, where D is the total thickness of slab.
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