StairsMeeting 4

Study Program : S0673 / Building Construction IIYear : 2007

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By the end of this meeting, expected student will be able to :

• Student can explain stairs construction conditions as building connection.

Learning Outcomes

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• Items 1 : Stairs condition for house remain and public building.

• Items 2 : Size measure and formula of counting stairs.

• Items 3 : Kinds of stair.

Outline Items

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1. Stairs have to be functional.Its meaning of form goodness, size measure and also materials of stair have to be adapted for existing building as well as have to be accommodated also with building function.

2. Stair have to easy to seen and reached.Its meaning stair location really earn easily reached by its user and not blocked and also enough light.

Condition of Stair

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3. Inclination of stair.Inclination of stair bevel angle may not too sloping because can be boring one who go up as well as needing many place.That way also stair bevel angle may not too steep so that endanger at the time of people go down.

• Inclination of stair / minimum stair angle 25o and maximum 42o

• Good Bevel stair angle between 36o – 40o

• Stair for house remain at the most 42o

• Stair for public building at the most 38o.6

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Inclination an stair earn also determined with formula :

a + 2 O = 60 – 62 cmWhich : a = wide of stair step = AantredeO = High of stair step = Optrede

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4. Size measure / to the number of stairStair step size measure very is influencing its user freshment.For House :a. Wide of stair step 22 – 30 cm. Good is 30 cm.b. High of stair step maximum 20 cm. Good is 16 – 17,5 cm.

For public building :a. Wide of stair step 30 cm, and may not less than 22,5 cm.b. High of stair step maximum 19cm and good is 14 – 15 cm.

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Stair step size measure have to uniform.Many foot step on stair in an zoom, may not more than 12 foot step. If high in the reality floor make the amount of foot step more than 12, hence can be made by arrange in steps with “ BORDES”.

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5. Wide StairWide an stair depended from the stair function as well as depended from building function.More and more one who often use the stair, wide it is of course stair will be more big compared to with stair which a little its user.Wide of stair in general:* House : 80 – 100 cm* Public building : 120 – 200 cmWide of stair is also reckoned when needed to street conveyor of goods.

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6. Free HighSuch is vertical free path is people moment stand up in stair, good start first foot step of stair, bordes and also until last foot step, people as well as transported to goods earn free walk without there is barrier above him.Free high minimum 2,00 M

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Stairs Construction• Stair have to be strong and sturdy.• Cannot make a move or joggle.• Comfortable and Simple form got through; except

planned certain to the beauty of an interior from an room.

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Making of stair is also influenced by roominess, wide and long of room and also high difference of existing floor.

From this data can be counted foot step of stair then determined by wanted arrange in steps.

Example :1. If wide of room, long of room do not limit, but

which is determined :- High difference of floor. ( H ) = 3,20 m- High size measure of Optrede ( O ) = 18 cm

Plan of Stairs

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Many foot step of stair and is wide of foot step can be determined as follows :Many foot step : H/O = 320 / 18 = 17,778 ~ 18 foot step

Wide of foot step ( a ) :a + 2O = 62a + ( 2 x 18 ) = 62

a = 26 cm

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2. If wide limited room length so that foot step can only be made 25 cm.With formula : a + 2O = 6225 + 2O = 62

O = 18,5 cmMany foot step : H / O = 320 / 18,5 = 17,29If taken 17, high of foot step of stair = 320/17

= 18,82 cmIf taken 18, high of foot step = 320 / 18

= 17,78 cmSo if taken 17 or 18, high foot step of stair still up to

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1. Diametrical Stair.2. Ordinary stair heel.3. Bordes Stair 90o

4. Bordes stair with 2 bordes among 180o

5. Bordes Stair 180o

6. Stair used to a quarter turn downwards.7. Stair used to a quarter turn to the top.8. Stair used to a quarter turn among.9. etc

Stairs Form

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Diametrical stair With Bordes H = Floor High = 2.80 mH1 = Bordes high = 1.40 mL = Stair lengthB = Wide length Wide Bordes = 1.00 ma = aantrede = 25 cmO = optrede = 17,5 cmh = High of arm rest = 80 cm

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a = aantrede = Stair angleb = Wide stairo = optrede B = Wide of bordesH = High of bordess = arm restL.D = Ground floor ( 0.00)L.T = High level floor

Fuik Method

1. Determining journey line with have directive 1/3 b from outside.

2. Dismember journey line each of = a3. Gives a number 1, 2, 3, ……. 12

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4. Area 1 – 2, 2 – 3 and others until 11 – 12 is not the same area.

5. Aantrede after no. 12 is Normal Aantrede.6. Measure AB from tip of baluster until dot

projection 12.7. Cut AB line = e, slice 11 same part, and gives a

number 1 until 12.8. Draw vertical line of dot 1 until 12 is mentioned.9. At vertical line of dot 12 measure a = Aantrede

is got dot 12’.10.At vertical line of dot 6 measure mark with lines

with length = 1/11 AB is got dot 6’.11.Draw line 12’ – 6’ and lengthened to cut vertical

line there are dot 1’, 2’, 3’ and so on.Bina Nusantara

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12. Vertical line 1 – 1’ = y12 – 2’ = y2 and so on

13. Cut line y1, y2, y3 and so on, this applied at line of AB mentioned gives a number 1”, 2”, 3” and so on.

14. Finally contact dot between: With 1” – With 2”

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