Staircases BCGCA3016B. Types of Stairs Straight Open Riser Dogleg Closed Riser Definition –...
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Transcript of Staircases BCGCA3016B. Types of Stairs Straight Open Riser Dogleg Closed Riser Definition –...
Staircases
BCGCA3016B
Types of Stairs
Straight Open Riser
Dogleg Closed Riser
Definition – Flights Between Landings
1 Flight2 Flights
Straight Open Riser
Stair Types
Double Closed Stair
Stair Types
Stair Types
Stair Types
Stair Types
Double Open Sided Stairs
In this case one side is closed while the other is open
Note The Bracketed Stairs refers to decoration & Cut String
Also Known as Cut String
Quarter Turn StairOpen Newel Stair
Spine String Stair
Types of Stairs
Geometric Spiral
Types of Stairs
Quarter Turn
Parts of Stairs
Parts of Stairs
Parts of Stairs
Parts of Stairs
Parts of Stairs
Parts of Stairs
Parts of Stairs
Parts of Stairs
Parts of Stairs
Parts of Stairs
Parts of Stairs
Half Space Landing
•Change stair direction 180⁰•Landing width = width of stair (min 750mm)•Used in Dogleg Stairs
Quarter Space Landing
•Change Stair Direction 90⁰•Landing Width & Length = Stair Width•Forms Quarter Turn Stair (min 750mm)
Intermediate Landing
•Allows the Stair to continue in same direction•Required where more than 18 Risers•May be used to give a rest•Width = Stair Width•Length = Stair Width or greater
Quarter Space Landing
Quarter Turn Stair
Winders
Materials Used in Stair Construction
• Timber• Metal• Stone• Glass
Timber Stairs
Metal Stairs
Concrete Stairs
Glass Stair
Combination of Materials
Definitions
Rise & Going must stay the same within flight
BCA Requirements
Stair Requirements
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
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 = 168.75mmUse 180mm is closer to 175mm
Best Going 2R + G Between 550 to 700Midpoint = 625
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 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 700Midpoint = 625
Either
Rise 180Going 265
Determine Best Going 2R + G = 625G = 625 – 2R
Best Going for180 Riser 265 = 625 – 2 x 180
Calculate StairNo Restriction on Going
UseRise 180Going 265
15 Risers
14 Goings
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 Going3800/14 = 271.43 + 2 x 180 = 631. 43 (Closest)3800/15 = 253.33 + 2 x 168.75 = 591
Best Going 2R + G Between 550 to 700Midpoint = 625
UseRise 180Going 271.43
15 Risers
14 Goings
Calculate Stair Flight with Quarter Turn
Stair width 900mmOnce an Intermediate Landing is introduced the top flight becomes constrained
Calculate Stair Flight with Quarter Turn
Stair width 900mm Preferred Rise = 165mm
2700/165 = 16 .364
16 2700/16= 168.75 (3.75 Diff)172700/17= 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)71800/7 = 257.143 (30.357 Diff)
Rise = 168.364Going = 300
Best Going 2R + G Between 550 to 700Midpoint = 625G = 625 – 2R
Calculate Stair Flight with Quarter Turn
Stair width 900mm Preferred Rise = 165mm
2700/165 = 16 .364
16 2700/16= 168.75 (3.75 Diff)172700/17= 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)71800/7 = 257.143 (30.357 Diff)
Rise = 168.364Going = 300
Best Going 2R + G Between 550 to 700Midpoint = 625G = 625 – 2R
Calculate StairConstrained Flight with Quarter Turn
Stair width 900mm
From Previous we know15 Risers at 180
Length of 1st Flight = 2700 - 900Divide by Best Going = 1800/265
= 6.79Going Either 1800 /6 = 300mm 1800/7 = 257mm
257.14 is Closest to 265
Best Going 2R + G Between 550 to 700Midpoint = 625625- 2 x 180 = 265
Calculate StairConstrained Flight with Half Space Landing
Stair width 900mm Preferred Riser 170mm
3600/170 = 21.176
21 3600/21 = 171.429223600/22 = 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 = 286.36412- 3150/12 = 262.500Use 286.364
Calculate StairConstrained Flight with Half Space Landing
Stair width 900mm Preferred Riser 170mm
Rise 171.429mm
Going 286.364
Calculate StairConstrained Flight with Quarter Turn Winders
Stair width 900mm Preferred Riser 170mm
4100/170 = 24.118
24 4100/24 = 170.83325 4100/24 = 164
Use Rise 170.833
Best Going625 – 2R = BG
625 – 2 x 170.833 = 283.334
2650/ 283.334 = 9.353
92650/9 = 294.444 (USE)102650/10 = 265
Rise 170.833Going 268.75
Calculate StairConstrained Flight with Quarter Turn Winders
Stair width 900mm Preferred Riser 170mm
4100/170 = 24.118
24 4100/24 = 170.83325 4100/24 = 164
Use Rise 170.833
Best Going625 – 2R = BG
625 – 2 x 170.833 = 283.334
2650/ 283.334 = 9.353
92650/9 = 294.444 (USE)102650/10 = 265
Rise 170.833Going 294.444
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)92400/9 = 266.667 (18.3 Diff)
Rise 170Going 300
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)92400/9 = 266.667 (18.3 Diff)
Rise 170Going 300
With all examples either answer will comply and you should consult with your client and/or Architect
Determine Steel Square Mathematically
40mm Margin
Determine Steel Square Mathematically
Determine Steel Square Mathematically
Zoom In
Stair Pitch = 29.54⁰
Determine Steel Square Mathematically
Margin Line
Stair Pitch = 29.54⁰
Determine Steel Square Mathematically
This angle must be the same Stair Pitch = 29.54⁰
Determine Steel Square Mathematically
This angle must be the same Stair Pitch = 29.54⁰
Sin Ѳ = Adjacent / Hypotenuse = 40 ÷ XX = 40 ÷ Sin 29.54X = 81.131
Determine Steel Square Mathematically
This angle must be the same Stair Pitch = 29.54⁰
Sin Ѳ = Adjacent / Hypotenuse = 40 ÷ XX = 40 ÷ Sin 29.54X = 81.13
Determine Steel Square Mathematically
Set Out For Steel Square GoingGoing + Margin ÷ Sin Ѳ= 300 + 40 ÷ Sin 29.54⁰= 381.13mm
Ѳ
Determine Steel Square Mathematically
Set Out For Steel Square Rise
Ѳ
Determine Steel Square Mathematically
Set Out For Steel Square Rise
Ѳ
This Angle must = 90 - 29.54
Determine Steel Square Mathematically
Set Out For Steel Square Rise
Ѳ
This Angle must = 90 - 29.54This Angle must = 29.54⁰
Y = 40 ÷ Cos 29.54⁰Y = 45.9763
Determine Steel Square Mathematically
Set Out For Steel Square Rise
Ѳ
This Angle must = 90 - 29.54This Angle must = 29.54⁰
Y = 40 ÷ Cos 29.54⁰Y = 45.9763
Determine Steel Square Mathematically
Set Out For Steel Square Rise
Ѳ
Rise + Margin ÷ Sin Ѳ= 170 + 40 ÷ Sin 29.54⁰= 170 + 45.98= 215.98