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