stairs dr. sumit khandelwal, malaviya national institute of technology jaipur, jaipur, india

Stairs

Dr. Sumit Khandelwal, Malaviya National Institute of

Technology Jaipur, Jaipur, INDIA

StairsFor access between different floorsMust be centrally located. If not,

approach must be clearly marked/knownMore than one stair in big buildingsRiser/tread to be decided according to

NBC provisionsMust be fire-resistantVariety of designsChoice of construction materials

Stairs: Related Terms

Stairs: Related Terms

Stairs: PlanningWidth shall be sufficient to provide

comfortable passage (domestic: 0.9-1.2 m, public: 1.2-1.8m)

Pitch between 25o to 45o

Riser shall be convenient for people of all ages (Public: normally 150 mm, Domestic: 150-180 mm)

Tread for public is 300 mm for domestic 250-300 mm

A flight shall have maximum 12 risersLanding width shall not be less than stair

widthMust have ample head room

Stair Types: Straight StairStair may have one flight or two flights with a

landingNormally open type stair with one side openSpace constraintsOnly for small buildings/ domestic buildingsAny material

Stair Types: Straight Stair

Stair Types: Quarter Turn Stair

Two flightsChange in direction, turns

left/rightDirection change facilitated

by landingWinders may also be there

instead of landing, when space problem

Stair Types: Quarter Turn Stair

Stair Types: Half Turn Stair Two or more flights Direction reversed at next

floor Direction change facilitated

by landing Landing width may be equal

to width of stair well Steps/winders may also be

used instead of landing More or less equal risers in

two main flights Most common type of stair Dog-legged or open newel

stair

Stair Types: Half Turn Stair

Stair Types: Half Turn Stair

Stair Types: Three Quarter Turn Stair

Direction changes by 270o

Normally used when height is more and limited length

Some flights have very few risers (only 3-4)

Stair Types: Bifurcated StairOne flight

bifurcates into two flights

Width of starting flights more than bifurcated flights

Normally for public buildings

Stair Types: Circular/Spiral Stair

Geometrical stairsOnly winders as

stepsContinuous

change in direction

Normally not the main staircase

Used to access areas having limited entry

Steel is them most common material

Stair Types: Circular/Spiral Stair

Stair Types: Helical StairGeometrical stairsOnly winders as

stepsContinuous

change in direction

Normally not the main staircase

Used to access areas having limited entry

Steel is them most common material