Question

Why torsional reinforcement is provided at corner of two way slab?

Answer 1

Torsion reinforcement shall be provided at any corner where the slab is simply supported on both edges meeting at that corner and is prevented from lifting unless the consequences of cracking are negligible. It shall consist of top and bottom reinforcement, each with layer of bars placed parallel to the sides of the slab and extending from the edges a minimum distance of one fifth of the shorter span. The area of reinforcement per unit width in each of these four layers shall be three quarters of the area required for the maximum mid-span moment per unit width in the slab. Torsion reinforcement equal to half that described above shall be provided at a corner contained by edges over only one of which the slab is continuous.

Answer 2

Torsional reinforcement is provided at the corner of the two-way slab to prevent the corner slab from lifting and also to prevent cracks.

Explanation:

• Torsional reinforcement is also called corner reinforcement.
• It is provided at the corner of the two-way slab.
• This is done to prevent the corner slab from lifting and also to prevent cracks.
• There can be two conditions for the slab corners.

1. Slab corners are held down
2. Slab corners are not held down

• When any type of load acts on the slab corners, it is termed slab corners are held down. It means they cannot lift up due to the load.
• When no such type of load acts on the slab corners, then they are free to lift up if the load is applied at the centre of the slab. It is called slab corner not held down.

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