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In the design of two-way slab restrained at all edges, torsional reinforcement required is
- a)0.375 times the area of steel provided at midspan in the same direction
- b)0.75 times the area of steel provided at midspan in the same direction
- c)0.375 times the area of steel provided in the shorter span
- d)nil
Correct answer is option 'B'. Can you explain this answer?
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In the design of two-way slab restrained at all edges, torsional reinf...
The design of two-way slab restrained at all edges requires torsional reinforcement. The correct option is (B) 0.75 times the area of steel provided at midspan in the same direction.
Explanation:
Torsional reinforcement is provided to resist the twisting or torsional forces that may develop in a slab due to the restraint provided at the edges. In a two-way slab, the torsional reinforcement is provided in both directions perpendicular to each other.
The amount of torsional reinforcement required is dependent on the amount of steel provided at midspan in the same direction. As per the IS code, the torsional reinforcement required is 0.75 times the area of steel provided at midspan in the same direction.
This means that if the area of steel provided at midspan in a particular direction is As, then the area of torsional reinforcement required in that direction would be 0.75As.
Option (A) 0.375 times the area of steel provided at midspan in the same direction is incorrect as it is only half of the correct value.
Option (C) 0.375 times the area of steel provided in the shorter span is also incorrect as it is not related to the amount of steel provided at midspan in the same direction.
Option (D) nil is incorrect as torsional reinforcement is always required in a two-way slab restrained at all edges.
Therefore, the correct option is (B) 0.75 times the area of steel provided at midspan in the same direction.
Explanation:
Torsional reinforcement is provided to resist the twisting or torsional forces that may develop in a slab due to the restraint provided at the edges. In a two-way slab, the torsional reinforcement is provided in both directions perpendicular to each other.
The amount of torsional reinforcement required is dependent on the amount of steel provided at midspan in the same direction. As per the IS code, the torsional reinforcement required is 0.75 times the area of steel provided at midspan in the same direction.
This means that if the area of steel provided at midspan in a particular direction is As, then the area of torsional reinforcement required in that direction would be 0.75As.
Option (A) 0.375 times the area of steel provided at midspan in the same direction is incorrect as it is only half of the correct value.
Option (C) 0.375 times the area of steel provided in the shorter span is also incorrect as it is not related to the amount of steel provided at midspan in the same direction.
Option (D) nil is incorrect as torsional reinforcement is always required in a two-way slab restrained at all edges.
Therefore, the correct option is (B) 0.75 times the area of steel provided at midspan in the same direction.
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Community Answer
In the design of two-way slab restrained at all edges, torsional reinf...
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. IS 456: 2000 recommends that the torsional reinforcement grid should extend beyond the edge for a distance not less than 20% of a shorter span. The total area of torsional steel provided in each of the four layers should not be less than:-
No torsional reinforcement is required if both the meeting edges are continuous.
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In the design of two-way slab restrained at all edges, torsional reinforcement required isa)0.375 times the area of steel provided at midspan in the same directionb)0.75 times the area of steel provided at midspan in the same directionc)0.375 times the area of steel provided in the shorter spand)nilCorrect answer is option 'B'. Can you explain this answer?
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