staircases 1
TRANSCRIPT
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Staircases
BCGCA3016B
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Types of Stairs
Straight Open
Riser
Dogleg Closed
Riser
Definition Flights
Between Landings
1 Flight2 Flights
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Straight Open Riser
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Stair Types
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Double Closed Stair
Stair Types
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Stair Types
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Stair Types
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Stair Types
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Double Open Sided Stairs
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In this case one side is closed while the other is open
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Note The Bracketed Stairs refers to
decoration & Cut String
Also Known as Cut String
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Quarter Turn Stair
Open Newel Stair
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Spine String Stair
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Types of Stairs
Geometric Spiral
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Types of Stairs
Quarter Turn
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Parts of Stairs
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Half Space Landing
Change stair direction 180:
Landing width = width of stair (min 750mm)
Used in Dogleg Stairs
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Quarter Space Landing
Change Stair Direction 90:
Landing Width & Length = Stair WidthForms Quarter Turn Stair (min 750mm)
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Intermediate Landing
Allows the Stair to continue in same direction
Required where more than 18 RisersMay be used to give a rest
Width = Stair Width
Length = Stair Width or greater
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Quarter Space Landing
Q T S i
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Quarter Turn Stair
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Winders
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Materials Used in Stair
Construction
Timber
Metal
Stone
Glass
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Timber Stairs
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Metal Stairs
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Concrete Stairs
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Stone Stairs
http://upload.wikimedia.org/wikipedia/commons/8/87/Potemkinstairs.jpg -
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Glass Stair
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Combination of
Materials
http://www.todstairs.com.au/Stair%20Parts/Parts%20of%20a%20STAIR%20diagram.pdf -
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Definitions
http://www.todstairs.com.au/Stair%20Parts/Parts%20of%20a%20STAIR%20diagram.pdf -
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Definitions
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Rise & Going must stay the same within flight
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BCA Requirements
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Stair Requirements
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Winders
Treads that are tapered
Must have same rise as the flights
Maximum of 3 treads per quarter turn
Must be same width at centre on widths < 1m
If stair > 1m same width 400mm from inside
handrail
Winders
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Winders
Calculate Stair
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Calculate StairNo Restriction on Going
Determine Total Rise = 2700
Select suitable Rise Say 175mm
Divide Total Rise by Rise = 2700/175 = 15.429
Either 15 or 16 Risers = 2700/15 = 180mm
2700/16 = 168.75mm
Use 180mm is closer to 175mm
Best Going
2R + G Between 550 to 700
Midpoint = 625
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Determine Best Going
BCA states that going must be within the
range
2 x Rise (R) + Going(G) = 550 to 700
We can assume that the best answer is the
Midpoint (550 + 700)/2 = 625
Best Going 2R + G = 625
Best Going G = 625 2R
Calculate Stair
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Calculate StairNo Restriction on Going
Determine Total Rise = 2700
Select suitable Rise Say 175mm
Divide Total Rise by Rise = 2700/175 = 15.429
Either 15 or 16 Risers = 2700/15 = 180mm (Use)
2700/16 = 168.75mm
Best Going
2R + G Between 550 to 700
Midpoint = 625
Either
Rise 180
Going 265
Determine Best Going 2R + G = 625
G = 625 2R
Best Going for180 Riser 265 = 625 2 x 180
Calculate Stair U
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Calculate StairNo Restriction on Going
Use
Rise 180
Going 265
15 Risers
14 Goings
Calculate StairBest Going
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Calculate StairRestriction on Going
Preferred Rise 175mmDivide Total Rise by Rise = 2700/175 = 15.429
Either 15 or 16 Risers = 2700/15 = 180mm
2700/16 = 168.75
Use 180mmDetermine Best Going
3800/14 = 271.43 + 2 x 180 = 631. 43 (Closest)
3800/15 = 253.33 + 2 x 168.75 = 591
Best Going
2R + G Between 550 to 700
Midpoint = 625
Use
Rise 180
Going 271.43
15 Risers
14 Goings
Calculate Stair
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Calculate StairFlight with Quarter Turn
Stair width 900mm
Once an Intermediate Landing is
introduced the top flight becomesconstrained
Calculate StairBest Going
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Calculate StairFlight with Quarter Turn
Stair width 900mm Preferred Rise = 165mm
2700/165 = 16 .364
16 2700/16= 168.75 (3.75 Diff)
17 2700/17= 158.824 (6.176 Diff)
Use Rise = 168.75
Best Going = 625 2R
= 625 2 x 168.75
= 287.5
1800/287.5 = 6.261
6 1800/6 = 300 (12.5 Diff)
7 1800/7 = 257.143 (30.357 Diff)
Rise = 168.364
Going = 300
Best Going
2R + G Between 550 to 700
Midpoint = 625
G = 625 2R
Calculate StairBest Going
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Calculate StairFlight with Quarter Turn
Stair width 900mm Preferred Rise = 165mm
2700/165 = 16 .364
16 2700/16= 168.75 (3.75 Diff)
17 2700/17= 158.824 (6.176 Diff)
Use Rise = 168.75
Best Going = 625 2R
= 625 2 x 168.75
= 287.5
1800/287.5 = 6.261
6 1800/6 = 300 (12.5 Diff)
7 1800/7 = 257.143 (30.357 Diff)
Rise = 168.364
Going = 300
Best Going
2R + G Between 550 to 700
Midpoint = 625
G = 625 2R
Calculate Stair
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Calculate StairConstrained Flight with Quarter Turn
Stair width 900mm
From Previous we know15 Risers at 180
Length of 1st Flight = 2700 - 900
Divide by Best Going = 1800/265
= 6.79
Going Either 1800 /6 = 300mm1800/7 = 257mm
257.14 is Closest to 265
Best Going
2R + G Between 550 to 700
Midpoint = 625625- 2 x 180 = 265
Calculate Stair
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Calculate StairConstrained Flight with Half Space Landing
Stair width 900mm Preferred Riser 170mm
3600/170 = 21.176
21 3600/21 = 171.429
22 3600/22 = 163.636
Use 171.429mm
Best Going = 625 2R
= 625 2 x 171.429
= 282.142
Length of 1st Flight = 4050 900
= 3150
Divide by Best Going = 3150/282.142
= 11.16
11 3150/11 = 286.364
12 - 3150/12 = 262.500
Use 286.364
Calculate Stair
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Calculate StairConstrained Flight with Half Space Landing
Stair width 900mm Preferred Riser 170mm
Rise 171.429mm
Going 286.364
Calculate Stair
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Calculate StairConstrained Flight with Quarter Turn Winders
Stair width 900mm Preferred Riser 170mm
4100/170 = 24.118
24 4100/24 = 170.833
25 4100/24 = 164
Use Rise 170.833
Best Going
625 2R = BG
625 2 x 170.833 = 283.334
2650/ 283.334 = 9.353
9 2650/9 = 294.444 (USE)
10 2650/10 = 265
Rise 170.833
Going 268.75
Calculate Stair
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Calculate StairConstrained Flight with Quarter Turn Winders
Stair width 900mm Preferred Riser 170mm
4100/170 = 24.118
24 4100/24 = 170.833
25 4100/24 = 164
Use Rise 170.833
Best Going
625 2R = BG
625 2 x 170.833 = 283.334
2650/ 283.334 = 9.353
9 2650/9 = 294.444 (USE)
10 2650/10 = 265
Rise 170.833
Going 294.444
Calculate Stair
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Calculate StairConstrained Flight with Half Space Landing
Stair width 950mm Preferred Riser 170mm
3400/170 = 203400/20 = 170 Rise
Best Going = 625 2R
= 625 2 x 170
= 285
2400/285 = 8.421
8 2400/8 = 300 (15 Diff)
9 2400/9 = 266.667 (18.3 Diff)
Rise 170
Going 300
Calculate Stair
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Calculate StairConstrained Flight with Half Space Landing
Stair width 950mm Preferred Riser 170mm
3400/170 = 203400/20 = 170 Rise
Best Going = 625 2R
= 625 2 x 170
= 285
2400/285 = 8.421
8 2400/8 = 300 (15 Diff)
9 2400/9 = 266.667 (18.3 Diff)
Rise 170
Going 300
With all examples either answer
will comply and you should
consult with your client
and/or Architect
Determine Steel Square Mathematically
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q y
40mm Margin
Determine Steel Square Mathematically
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q y
Determine Steel Square Mathematically
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q y
Zoom In
Stair Pitch = 29.54:
Determine Steel Square Mathematically
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q y
Margin Line
Stair Pitch = 29.54:
Determine Steel Square Mathematically
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q y
This angle must be the same
Stair Pitch = 29.54:
Determine Steel Square Mathematically
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q y
This angle must be the same
Stair Pitch = 29.54:
Sin = Adjacent / Hypotenuse
= 40 X
X = 40 Sin 29.54
X = 81.131
Determine Steel Square Mathematically
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q y
This angle must be the same
Stair Pitch = 29.54:
Sin = Adjacent / Hypotenuse
= 40 X
X = 40 Sin 29.54
X = 81.13
Determine Steel Square Mathematically
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q y
Set Out For Steel Square Going
Going + Margin
Sin = 300 + 40 Sin 29.54:
= 381.13mm
Determine Steel Square Mathematically
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Set Out For Steel Square Rise
Determine Steel Square Mathematically
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Set Out For Steel Square Rise
This Angle must = 90 - 29.54
Determine Steel Square Mathematically
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Set Out For Steel Square Rise
This Angle must = 90 - 29.54This Angle must = 29.54:
Y = 40 Cos 29.54:
Y = 45.9763
Determine Steel Square Mathematically
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Set Out For Steel Square Rise
This Angle must = 90 - 29.54This Angle must = 29.54:
Y = 40 Cos 29.54:
Y = 45.9763
Determine Steel Square Mathematically
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Set Out For Steel Square Rise
Rise + Margin Sin = 170 + 40 Sin 29.54:
= 170 + 45.98
= 215.98