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For stairs spanning horizontally, the minimum waist provided is
Answer & Solution
Correct Answer:
Option
B
In RCC stair design, the waist is the minimum thickness of the inclined slab measured perpendicular to the soffit of the stair.
For stairs spanning horizontally, the slab behaves like a reinforced concrete slab and must have sufficient thickness to safely resist bending moments and shear forces.
As per standard RCC design practice, a minimum waist thickness of 12 cm is required to ensure adequate strength, stiffness, and durability.
Providing a waist thickness less than this may lead to excessive deflection and structural inadequacy.
Therefore, the correct answer is Option D – 12 cm.
For stairs spanning horizontally, the slab behaves like a reinforced concrete slab and must have sufficient thickness to safely resist bending moments and shear forces.
As per standard RCC design practice, a minimum waist thickness of 12 cm is required to ensure adequate strength, stiffness, and durability.
Providing a waist thickness less than this may lead to excessive deflection and structural inadequacy.
Therefore, the correct answer is Option D – 12 cm.
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