REQUIREMENT OF GOOD STAIRCASE • Stairs should be so located that it is easily accessible from the different rooms of a building. • It should have adequate light and proper ventilation. • It should have sufficient stair width to accommodate no. of persons in peak hour/emergency. Generally for interior stairs, clear width may be  at least 50cm in one/two family dwellings  at least 90cm in hotels, motels, apartment and industrial building  at least 1.1m for other types like hospitals, temples etc. • No. of steps in a flight should be restricted to a maximum of 12, minimum of 3. • Ample head room should be provided for tall people to give feeling of spaciousness. It should be minimum of 2.15m. • Risers and treads sizes should be provided from common point view. Tread = 2.5cm – 32.5 cm (wide), excluding nosing. Tread < 25cm, should have a nosing of about 2.5cm Comfortable height of riser = 17.5cm-18.5cm.  Riser * tread = (400-410). 426  Riser tread = (42.5-43.5) 40-45  2(riser) tread = 60-64 cm 60 Take rise = 14cm, going = 30cm.for each 2cm substracted from going, add 1cm to rise. • Stair width depends on purpose and importance of building. • No. of stairways required should be controlled by maximum floor area contributory to stairway. (No. of persons using stairs/floor/55cm stairwidth) should be 15 for hospital and nursing home. Should be 30 for institutional and residential building Should be 45 for storage building Should be 60 for mercantile, educational, industrial building, theatres, restaurants. Should be 80 for church concert hall, museum Should be 320 for stadium and amutementstructures. • Minimum width of landing = width of stair • Maximum and minimum pitch should be 400 and 250 . • Winder should be provided at lower end of flight when it is essential. Use of winder should be avoided. • Live load to be considers n stairs have been stipulated by IS 875-1964 • Stairs and landings should be designed for live load of 3000kg/m.s2 in building where there are no possibilities of overcrowding in public building and warehouses where overcrowding is likely live load may be taken as 500kg • Railing should be design for horizontal force of 55 and vertical force of 70 applied at top of rail - Study24x7
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soyab khan
12 Apr 2019 09:37 AM study24x7 study24x7

REQUIREMENT OF GOOD STAIRCASE • Stairs should be so located that it is easily accessible from the different rooms of a building. • It should have adequate light and proper ventilation. • It should have sufficient stair width to accommodate no. of persons in peak hour/emerge...

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