# 10 DIFFERENT TYPES OF STAIRS COMMONLY DESIGNED FOR BUILDINGS

A staircase is a series of stairs arranged in such a way as to connect the different floors of a building. Stairs are designed to provide easy and quick access to different floors. A ladder is an enclosure that contains the entire ladder.

The stairs are generally of the following types

1. straight stairs
2. quarter turn stairs
3. half turn stairs
4. three quarter turn stairs
5. circular stairs
6. curved stairs
7. curved stairs
8. geometric stairs
9. bifurcated stairs and
10. combination of types

## 1. straight stairs

These are stairs along which there is no change of direction on any flight between two successive floors. Straight stairs can be of the following types.

• straight race with a single flight between floors
• run straight with a series of flight without a change in direction
• parallel stairs
• angle stairs
• scissor stairs

There may be a change in the direction of straight stairs at an intermediate landing. In the case of angle stairs, the successive flights are at an angle to each other. Scissor stairs consist of a pair of straight treads in opposite directions and placed on opposite sides of a fire-resistant wall.

## 2. quarter turn stairs

They are awarded when the flight direction is 90 . to change to0, Change of direction can be done either by introducing quarter space landing or by providing winders at junctions.

## 3. half turn stairs

These stairs are 180. change its direction from0, It can be either dog-legged or open null type. In the case of dog-legged stairs, the flights are in opposite directions and no space is given between the flights in the plan. Open new stairs, on the other hand, have a well or opening between the flights and can be used to accommodate an elevator. These stairs are used in those places where sufficient space is available.

## 4. three quarter turn stairs

This type of stairs 270. change its direction through0, In other words, the direction is changed three times, with its upper flight crossing the lower one. In this type of construction an open well is formed.

## 5. circular stairs

Viewed from above, these stairs appear to follow a circle with a single center of curvature and a large radius. These stairs are generally provided at the back of a building to provide access for servicing on different floors. All stairs come out of a new post as winders. These stairs can be constructed in stone, cast iron or RCC

## 6. curved stairs

These stairs are similar to circular stairs, except that the radius of curvature is smaller and the stairs can be supported by a center post. The total diameter of such stairs can be from 1 to 2.5 m.

## 7. curved stairs

Viewed from above, these stairs appear to follow a curve with two or more centers of curvature, such as an ellipse.

## 8. geometric stairs

These stairs have no new posts and are of any geometric shape. The change in direction of these stairs is achieved by means of winders. Stairs require more skill to build and are looser than new open stairs. These stairs have curved open wells between the front and back flights.

## 9. bifurcated stairs

These stairs are arranged in such a way that there is a wide flight at the beginning which is divided into narrow flights at the middle landing. Two narrow flights begin on either side of the mid landing. Generally these stairs are more suitable for modern public buildings.

## 10. combination of different types

Based on the requirement of a building or as per the demand of the owner some of the variants mentioned above can be combined to design a new staircase.

Er. Mukesh Kumar

Er. Mukesh Kumar is Editor in Chief and Co-Funder at ProCivilEngineer.com Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.