For stairs spanning horizontally, the minimum waist provided is
A. 4 cm
B. 6 cm
C. 8 cm
D. 12 cm
Answer: Option B
Solution (By Examveda Team)
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.
This Question Belongs to Civil Engineering >> RCC Structures Design
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Comments (2)
Distribution of shear intensity over a rectangular section of a beam, follows:
A. A circular curve
B. A straight line
C. A parabolic curve
D. An elliptical curve
If the shear stress in a R.C.C. beam is
A. Equal or less than 5 kg/cm2, no shear reinforcement is provided
B. Greater than 4 kg/cm2, but less than 20 kg/cm2, shear reinforcement is provided
C. Greater than 20 kg/cm2, the size of the section is changed
D. All the above
In a pre-stressed member it is advisable to use
A. Low strength concrete only
B. High strength concrete only
C. Low strength concrete but high tensile steel
D. High strength concrete and high tensile steel
In a simply supported slab, alternate bars are curtailed at
A. $${\frac{1}{4}^{{\text{th}}}}$$ of the span
B. $${\frac{1}{5}^{{\text{th}}}}$$ of the span
C. $${\frac{1}{6}^{{\text{th}}}}$$ of the span
D. $${\frac{1}{7}^{{\text{th}}}}$$ of the span
it should be 12cm the correct option is D please examveda correct it most of resources says 12CM plz update it.
8 cm according to khurmi