staircase: my teaching for 1st year b.architecture

Hrishiraj Sarma/APIED/2013 1

STAIRCASE

Importance and study


STAIRCASEIt is impossible for an Architect to escape from staircase in his lifetime.

1. Medium of travel which connects two consecutive horizontal surfaces.

2. A complete arrangement of steps, stringers, newel posts, hand rails, balusters, etc.

3. Easy and quick access to different floors with comfort and safety.


5 points to understand1. Understanding design aspects.

2. Knowledge of materials.3. Types of staircase and their

respective uses.4. Terminologies and dimensions.5. Detailing; structural details and

fixing details.


Design aspectsType of

Building

Type of Use

Standards (IS Code)

Strength and load

Where to locate a staircase?

Type of Staircase


Classification of stairs

1. Straight stairs



2. Dog-legged stairs



3. Open-newel stairs



4. Quarter turn newel stairs

5. Half turn newel stairs



6. Geometric stairs



7. Spiral stairs

8. Bifurcated stairs



9. Circular stairs


Stair of different materials

Wooden stair

Stone stair

Metal stair


Stair of different materials

R.C.C stair

Brick stair

Movable stair

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Terminologies related to staircase

Hrishiraj Sarma/APIED/2013

TREAD: it is the upper horizontal portion of a step upon which the foot is placed while ascending or descending.RISER: it is the vertical portion of a step providing a support to the tread. FLIGHT: this is defined as an unbroken series of steps between landings.LANDING: it is the level platform at the top or bottom of a flight between the floors. A landing facilitates change of direction and provides an opportunity for taking rest during the use of the stair.


Terminologies related to staircaseRISE: it is the vertical distance between two successive tread faces.GOING: it is the horizontal distance between two successive riser faces. STRINGS AND STRINGERS: these are the slopping members which support the steps in a stair. They run along the slope of the stair.NEWEL POST: newel post is a vertical member which is placed at the ends of flights to connect the ends of strings and hand rail.


Terminologies related to staircaseBALUSTER: it is vertical member of wood or metal, supporting the hand rail.HAND RAIL: it is the surrounded or moulded member of wood or metal following generally the contour of the nosing line, and fixed on the top of balusters.


Elements of staircase

OR GOING


Technical details

Dog-legged stair in timber

Different types of handrails


Technical details

Methods of fixing balusters in stone steps Detail of R.C.C stair


Technical details

Detail of wooden stair Structural details of precast R.C.C

spiral stair


Technical details

Typical section of stair


Requirements of a good stair1. Location.2. Width of a stair (minimum 90 cm in residential use).3. Length of flight (maximum 12 steps ).4. Pitch of stair (should not exceed 40 degree and

should not be flatter than 25 degree).5. Head room (should not less than 2.14m).6. Materials.7. Balustrade to ensure safety.8. Landing (should not be less than the width of stair).9. Avoid winders and extra materials. Use optimum

use of materials.10.Step proportion.


Step proportion1. Tread + (2 X Riser) = 602. Tread X Riser = 450 (maximum)

Key dimensions1. Tread= 30 cm2. Riser = 15 cm3. Width = 90 cm (Residential building), 180 cm in

public building4. Height of newel post = 90 cm


Use staircaseStay healthy !!

Thank You

staircase: my teaching for 1st year b.architecture

Education

c spiral stair

width of stair

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stair minimum

pitch of stair