👉ስለ STAIRS ትንሽ ጠቃሚ ሃሳብ እንማማር 👇
🚧Calculations for the construction of stairs, ramps and guards are set out in various national building regulations.
💫The guidelines here are based on German standards.
▶️Dwellings with no more than two flats must have an effective stair width of at least 0.80 m and 17/29 rise-to-tread ratio. Stairs which are not strictly covered by building regulations may be as little as 0.50m wide and have a 21/21 ratio.
⏺Stairs governed by building regulations must have a width of 1.00m and a ratio of 17/28.
⏺In high rise flats they must be 1.25 m wide
⏺The length of stair runs from 23 steps up to 18 steps --> @ Landing length = n times the length of stride + 1 depth of step (e.g. with a rise-to-tread ratio of 17/29 = 1 x 63 + 29 = 92 cm or 2 x 63 + 29 = 1.55 m).
⏺Doors opening into the stairwell must not restrict the effective width.
▶️The time required for complete evacuation must be calculated for stair widths in public buildings or theatres. Such staircases or front entrance steps are climbed slowly, so they can have a more gradual ascent.
▶️A staircase at a side entrance or emergency stairs should make a rapid descent easy.
▶️The experiences one has of ascending and descending stairs varies greatly with the stair design, for example there is a significant difference between an interior domestic design and a grand flight of entrance steps.
⏺Climbing stairs takes on average seven times as much energy as walking on the flat.
⏺From the physiological point of view, the best use of 'climbing effort' is with an angle of incline of 30° and a ratio of rise of: rise of step/going of step; r/g= 17/29.
▶️The angle of rise is determined by the length of an adult's stride (about 61-64cm). To arrive at the optimum rise, which takes the least energy, the following formula can be applied: 2r+ g= 63cm (1 stride)
▶️In the dimensioning and design of flights of stairs, the function and purpose of the staircase is of primary importance, taking in the factors mentioned above.
▶️Not only is the gaining of height important, but also the way that the height is gained. For front door steps in frequent use, low steps of 16 x 30cm are preferable.
⏹However, stairs in a workplace, or emergency stairs, should enable height to be gained rapidly.
⏺Every main staircase must be set in its own continuous stairwell, which together with its access routes and exit to the open air, should be designed and arranged so as to ensure its safe use as an emergency exit. The width of the exit should be greater than or equal tothe width of the staircase.
@etconp
🚧Calculations for the construction of stairs, ramps and guards are set out in various national building regulations.
💫The guidelines here are based on German standards.
▶️Dwellings with no more than two flats must have an effective stair width of at least 0.80 m and 17/29 rise-to-tread ratio. Stairs which are not strictly covered by building regulations may be as little as 0.50m wide and have a 21/21 ratio.
⏺Stairs governed by building regulations must have a width of 1.00m and a ratio of 17/28.
⏺In high rise flats they must be 1.25 m wide
⏺The length of stair runs from 23 steps up to 18 steps --> @ Landing length = n times the length of stride + 1 depth of step (e.g. with a rise-to-tread ratio of 17/29 = 1 x 63 + 29 = 92 cm or 2 x 63 + 29 = 1.55 m).
⏺Doors opening into the stairwell must not restrict the effective width.
▶️The time required for complete evacuation must be calculated for stair widths in public buildings or theatres. Such staircases or front entrance steps are climbed slowly, so they can have a more gradual ascent.
▶️A staircase at a side entrance or emergency stairs should make a rapid descent easy.
▶️The experiences one has of ascending and descending stairs varies greatly with the stair design, for example there is a significant difference between an interior domestic design and a grand flight of entrance steps.
⏺Climbing stairs takes on average seven times as much energy as walking on the flat.
⏺From the physiological point of view, the best use of 'climbing effort' is with an angle of incline of 30° and a ratio of rise of: rise of step/going of step; r/g= 17/29.
▶️The angle of rise is determined by the length of an adult's stride (about 61-64cm). To arrive at the optimum rise, which takes the least energy, the following formula can be applied: 2r+ g= 63cm (1 stride)
▶️In the dimensioning and design of flights of stairs, the function and purpose of the staircase is of primary importance, taking in the factors mentioned above.
▶️Not only is the gaining of height important, but also the way that the height is gained. For front door steps in frequent use, low steps of 16 x 30cm are preferable.
⏹However, stairs in a workplace, or emergency stairs, should enable height to be gained rapidly.
⏺Every main staircase must be set in its own continuous stairwell, which together with its access routes and exit to the open air, should be designed and arranged so as to ensure its safe use as an emergency exit. The width of the exit should be greater than or equal tothe width of the staircase.
@etconp