STAIRS 

Represented by:- Abdirahman Beder muse

Roll:-08Dhaka International University

definition

A stair may be defined as series of steps suitably arranged for the purpose of connecting different floors of a building.

Parts of stair

1. Newel post :This is the vertical member which is placed at the ends of flights

to connect handrail .2. Run :It is the total length of stairs in a horizontal plane, including

landings.3. Nosing :It is the projecting part of the tread beyond the face of the riser.It is rounded to give good architectural effect.4. String Or Stingers :These are the sloping wooden members which support the steps

in a stair .They run along the slope of the stair.

5. Step :It is a portion of stair which permits ascent & descent.6. Tread :It is the upper horizontal portion of step upon which the feet is

placed.7. Riser :The vertical portion between each tread on the stair.8. Handrail :A handrail is a rail that is designed to be grasped by the hand so as

to provide stability or support9. Baluster :It is vertical member of wood or metal supporting the handrail.

Handrail Bluster

Newel

Newel cup

Risers

Noising

Run

Tread

A:- Classification of stairs in the shape

Straight stair Open newel stair Circular stair Dog-legged stair Geometrical stair Bifurcated stair

Straight strainThe most obvious Use of the straight strainis to form an access toEntrance, porch or Portico.

Straight stair

Handrail

Address:- uttura masjid

Open newel strain

• It consist of two or more , straight Flights arranged in such a manner That a clear space called {well}Occurs This well may be rectangular or of any geometrical shape and it can be used for fixing lift

Open newel stair

Handrail

address:- permanent campus of DIU

Circular stairIt is known as spiral stair.

When viewed from top it appears to follow a circle with a single centre of curvature.

The spiral stairs are provided where space available is limited and traffic is low.

These stairs can be constructed in R.C.C., Steel or Stone

THIS IS FROM INTERNET

DOG-LEGGED STAIR It consists two straight flights of steps with abrupt turn between them .Usually a level landing is placed across the two

GEOMETRICAL STAIR

This is a similar to the open newel stair with the difference that he open well between forward and back ward flight is. curved

Handrail

Bluster

Address:- Diu banani campus

BIFURCATED STAIR

•This type of stair is provided in modern public building .•The two narrow flight starts from either side of the mid-landing.

Bifurcated stair Handrail

This is from internet

B:- classification of stair in material

Wooden stair Stone stair Metal stair Reinforced concrete Escalators

Wooden stair

Timber is mainly used for stair construction where fire resistance is not of much consideration.

Timber stairs areI. CheapII. Easy in constructionIII. Light weight

Less 32 mm

Stone stairStair made out of hard, strong, resisting to

wear Stones are found to be durable and fire

resisting.They are commonly constructed in work

shops,Warehouses and other public buildings.

Stone stair this is from internet

Escalators

A power-driving, include, continuous stair way, used for raising or lowering the passenger

Is called an escalatorThe main components of an escalator are

steel Trussed frame work and hand rails

Handrail

Address:- over bridge at the airport

Metal stair

Address:-0ver bridge in middle badda

Reinforced concrete

 Address:- Mirpur road, Dhanmondi , Dhaka , Bangladesh

Some Amazing Stairs :

STAY HEALTHY !!!