For stairs spanning horizontally the minimum waist provided is

Home / Civil Engineering / RCC Structures Design / Question

Examveda

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

Join The Discussion

Comments (2)

Muhammad Ali:

8 months ago

it should be 12cm the correct option is D please examveda correct it most of resources says 12CM plz update it.
Kashif Niazi:

2 years ago

8 cm according to khurmi

Related Questions on RCC Structures Design

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

View Answer

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

View Answer

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

View Answer

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

View Answer