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Question
In two-way slabs, the torsional reinforcement is provided at:
A.
mid depth only
B.
top face only
C.
bottom face only
D.
top and bottom face both
Answer ( Option D)

top and bottom face both

Solution

Torsional Reinforcement Detailing in slab:
Torsional reinforcement is provided in the form of a grid or mesh both at the top and bottom of the slab,
Cl.D-1.8 of IS 456:2000 recommends that the torsional reinforcement grid/mesh should extend beyond the edge for a distance not less than 20% of shorter span
The total area of torsional steel provided in each of the four layers should not be less than:
(i) 0.75 Astx(+ve) If both the meeting edges are discontinuous i.e. edge 1.
(ii) 0.375 Astx(+ve) If one of the two meeting edges, one is continuous and the other discontinuous i.e. edge 2 and 3.
(iii) As per Cl. D-1.10 of IS 456:2000 No torsional reinforcement is required if both the meeting edges are continuous i.e. edge 4
Here,
Astx(+ve) denotes the area of flexural steel required for maximum mid-span moment in the short direction.

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