Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
749 views
in General by (102k points)
closed by
The size of a step commonly adopted for residential buildings is
1. 25 cm × 16 cm
2. 17 cm × 15 cm
3. 30 cm × 13 cm
4. 35 cm × 10 cm

1 Answer

0 votes
by (101k points)
selected by
 
Best answer
Correct Answer - Option 1 : 25 cm × 16 cm

Explanation:

(i) For residental building, common size of steps is (16 × 25) cm and Public buildings: (27 cm x 15 cm) to (30 x 14 cm)

(ii) Following thumb rules are commonly used for obtaining a satisfactory proportion of the tread and riser of a step:

  • (Rise in cm) + (Tread in cm) = 40 to 45
  • (Rise in cm) × (Tread in cm) = 400 to 450
  • (2 × Rise in cm) + (Tread in cm) = 60
  • Take rise = 140 mm and going = 300 mm as standard.

In case of flight, number of treads = riser - 1

However, the general relationship between riser and tread is given by:

(2 x Riser) + Tread = Step Length

  

The following are the components of the staircase

Components

Definition

Step:

 

It is a portion of the stair which permits ascent or descent. A stair is composed of a set of steps.

Tread:

 

It is an upper horizontal portion of a step upon which foot is placed while ascending or descending.

Riser:

It is a vertical portion of a step providing support to the tread.

Landing:

It is a level platform at the top or bottom of a flight between the floors.

Flight:

This is an unbroken series of steps between landing.

Rise:

It is a vertical distance between two successive tread faces.

Going:

It is a horizontal distance between two successive riser faces.

Nosing:

It is the projecting part of the tread beyond the face of the riser.

Scotia:

It is a molding provided under the nosing to provide strength to the nosing.

Soffit:

It is the underside of a stair.

Pitch or Slope:

It is the angle which the line of the nosing of the stair makes with the horizontal.

Strings:

These are the slopping members which support the steps in a stair.

Newel post:

 

Newel post is a vertical member which is placed at the ends of flight to connects the ends of strings and handrail.

Baluster:

It is a vertical member of wood or metal, supporting the handrail.

Headroom:

It is the clear vertical distance between the tread and overload structure.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...