According to IS 456:2000, a slab is classified as a one-way slab when:
A
It has support on all four sides
B
It is rectangular in shape
D
It has reinforcement in two directions
Analysis & Theory
A slab is considered one-way if the ratio of longer span (Ly) to shorter span (Lx) is greater than 2. Load is mostly carried in one direction.
In a two-way slab, the load is:
A
Carried only in the shorter direction
B
Carried only in the longer direction
C
Shared in both directions
Analysis & Theory
In a two-way slab (Ly/Lx ≤ 2), the load is distributed in both directions due to support on all sides.
The minimum slab thickness as per IS 456:2000 for a simply supported one-way slab is:
Analysis & Theory
IS 456:2000 recommends a minimum thickness of 100 mm for slabs.
Minimum percentage of tensile reinforcement in slabs as per IS 456 is:
A
0.12% of gross area for HYSD bars
B
0.15% of gross area for HYSD bars
C
0.15% of gross area for mild steel bars
D
0.12% of gross area for mild steel bars
Analysis & Theory
Minimum reinforcement for HYSD bars is 0.12% of gross cross-sectional area (IS 456:2000 Clause 26.5.2.1).
Main reinforcement in one-way slab is provided:
C
In both directions equally
Analysis & Theory
In a one-way slab, bending occurs mainly in the shorter span direction, so main reinforcement is provided along that span.
For a two-way slab with corners not held down, what type of moment occurs at the corners?
Analysis & Theory
If corners are free to lift, torsional moments develop at corners which are resisted using torsion reinforcement (IS 456 Clause 24.5).
What is the standard live load for residential floors as per IS 875?
Analysis & Theory
According to IS 875 Part 2, the live load for residential buildings is generally taken as 2.0 kN/m².
Which code provides guidelines for slab design in India?
Analysis & Theory
IS 456:2000 is the Indian Standard Code for Plain and Reinforced Concrete design, including slabs.