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For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is
Answer & Solution
Correct Answer:
Option
B
The given slab dimensions are 3m x 3.5m. Since (3.5/3) < 2, it is classified as a two-dimensional slab.
Deflection criteria as per IS 456:2000:
- For a simply supported slab, the span/depth ratio = 35
- For a continuous slab, the span/depth ratio = 40
Since we always design the slab for the shorter span (3m):
Effective depth (d) = 3000 mm / 40 = 75 mm
Thus, the minimum overall depth of the slab should be 75 mm to satisfy vertical deflection limits.
Deflection criteria as per IS 456:2000:
- For a simply supported slab, the span/depth ratio = 35
- For a continuous slab, the span/depth ratio = 40
Since we always design the slab for the shorter span (3m):
Effective depth (d) = 3000 mm / 40 = 75 mm
Thus, the minimum overall depth of the slab should be 75 mm to satisfy vertical deflection limits.
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LoginMeans slab is Two dimensional slab
We know for two dimensional slab
Vertical deflection -
For Simply supported slab = 35
For Continuous Slab = 40
(we design slab for shorter span always)
So for given question
3/depth = 40
So depth = 3000 (in mm)/ 40
Eff. Depth = 75mm
3000/40=75mm