Post on 19-Aug-2015
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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.
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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.
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Design aspectsType of
Building
Type of Use
Standards (IS Code)
Strength and load
Where to locate a staircase?
Type of Staircase
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Classification of stairs
4. Quarter turn newel stairs
5. Half turn newel stairs
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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.
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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.
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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.
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Technical details
Dog-legged stair in timber
Different types of handrails
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Technical details
Methods of fixing balusters in stone steps Detail of R.C.C stair
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Technical details
Detail of wooden stair Structural details of precast R.C.C
spiral stair
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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.
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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