Civil Engineering - RCC Structures Design - Discussion


For stairs spanning horizontally, the minimum waist provided is

[A]. 4 cm
[B]. 6 cm
[C]. 8 cm
[D]. 10 cm
[E]. 12 cm.

Answer: Option E


No answer description available for this question.

Savita said: (Aug 21, 2015)  
Minimum waist slab should be 8 cm.

Ganesh said: (Oct 23, 2015)  
Please somebody answer.

Vkey said: (Oct 12, 2016)  
Exactly @Savita. Minimum thickness of waist slab should be 80mm.

Deep said: (Nov 22, 2016)  
8cm is the correct option.

Sujeet Yadav said: (Nov 23, 2016)  
I agree with the given answer i.e. Option E.

Vikrant said: (Dec 18, 2016)  
Yes. 8 cm is the correct answer.

Karthika said: (Dec 25, 2016)  
How? please explain.

Ali Baloch said: (Jan 10, 2017)  
What is meant by spanning horizontally and what is meant by waist? Please explain.

Manish Sahu said: (Jan 26, 2017)  
@Ali Baloch.

Spanning horizontally means horizontal member length and waist slab is that on which rise and tread constructed.

Raj said: (Mar 16, 2017)  
80mm is the right answer.

Munna said: (Jun 21, 2017)  
The waist slab always 150mm,
So 120mn right answer.

Madhupatel.b said: (Sep 27, 2017)  
Spanning horizontally is nothing but considering the design as a horizontal slab. Waist slab is the minimum distance of the stair upper surface to the lower slab bottom. That can be decided by the design. But for an RCC minimum slab width must be greater than 3.5 inches so we can say 80 mm.

Hesan said: (Dec 21, 2017)  
Minimum width of stair 90 cm.
so minimum width of the waist will be 90cm.
Right answer 90 cm.

Uttam said: (Feb 24, 2018)  
Yes it should be 8 cm.
Ref: R.S. Khurmi/ conventional and objective type civil engineering book.

Hemanth H M said: (Jun 20, 2018)  
It should be 80 mm.

Atul Soni said: (Oct 7, 2018)  
The minimum waist of the stair is 1/25 to 1/30.

Abbas Khan said: (Dec 14, 2018)  
According to me, It is 8 cm.

Suman Khadka said: (Feb 11, 2019)  
It should be equal to slab thickness so 120 mm is correct.

Riya Biswas said: (Feb 12, 2019)  
80 mm for stair dpanung horizontally.

Cigo said: (May 23, 2019)  
Here, 8 cm is the correct answer.

Ms Khan Mewati said: (Aug 29, 2019)  
8 cm is Correct.

Sakun said: (Feb 26, 2021)  
12 cm is the correct answer.

Muhammad Tabish said: (Aug 1, 2022)  
The waist is the thickness of an inclined slab and it is considered 8cm for the stair spanning horizontally

Mali Alpesh K said: (Sep 27, 2022)  
Yes, it should be 8 cm.

Ref: R.S. Khurmi.

MUHAMMAD NABI said: (Nov 23, 2022)  
As per my knowledge, it will be 120mm.

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