Staircases 1

7/30/2019 Staircases 1

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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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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


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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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


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



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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


Midpoint = 625

G = 625 2R



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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


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


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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Rise 171.429mm

Going 286.364

Calculate Stair


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Calculate StairConstrained Flight with Quarter Turn Winders


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


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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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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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



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q y



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q y

Zoom In

Stair Pitch = 29.54:



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q y

Margin Line




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q y

This angle must be the same




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q y



Sin = Adjacent / Hypotenuse

= 40 X

X = 40 Sin 29.54

X = 81.131



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q y



Sin = Adjacent / Hypotenuse

= 40 X

X = 40 Sin 29.54

X = 81.13



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q y

Set Out For Steel Square Going

Going + Margin

Sin = 300 + 40 Sin 29.54:

= 381.13mm



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Set Out For Steel Square Rise



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This Angle must = 90 - 29.54



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This Angle must = 90 - 29.54This Angle must = 29.54:

Y = 40 Cos 29.54:

Y = 45.9763



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This Angle must = 90 - 29.54This Angle must = 29.54:

Y = 40 Cos 29.54:

Y = 45.9763



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Rise + Margin Sin = 170 + 40 Sin 29.54:

= 170 + 45.98

= 215.98

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Staircases 1