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Basic Structural Element Design to BS 8110-1:1997
4.0
Staircase Design
Figure 4.1: Plan view of the stair case in the General Arrangement Drawing
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Basic Structural Element Design to BS 8110-1:1997
S
Figure 4.2: Plan view of the stair case
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Basic Structural Element Design to BS 8110-1:1997
Reference
Calculations
Out Put
Layout
Riser
= R = 150mm
Going
= G = 300mm
As per “ Graded Examples in Reinforced Concrete Design “ by Prof. W.P.S Dias 2R+G should kept close as possible to 600mm. =
2R + G = 2 × 150 + 300 = 600mm
Nosing is 25mm. Hence Tread
=
T = 300 + 25 = 325mm
Cover
BS 8110-1:1997
For durability requirements: Assume mild exposure conditions.
Table 3.3
Nominal Cover required is 20mm.
BS 8110-1:1997
For fire requirements: Assume 2 hour fire resistance
Table 3.4
Nominal Cover required is 25mm Hence Select a cover of 25mm.
Cover 25mm
Loads 2
Finishes on Tread
= 1kN/m
Finishes on soffit plaster
=
Imposed loads
= 3kN/m
2 0.25kN/m
2
Cl.3.10.1.2
Distribution of Loading
BS 8110-1:1997
Staircase is built monolithically at its ends in to structural members spanning right angles to its span. Hence Effective depth can be evaluated as follows.
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Reference
Calculations
Out Put
la = 3.3
l b,1
= 2.8m > 1.8m
l b,1
= 1.8m
l b,2
= 1.325m < 1.8m
l b,2
= 1.8m = l + 0.5(l
Effective span
a
b1
+l
b2
)
= 3.3 + 0.5(1.8 + 1.325) = 4.8625m
Initial Waist Thickness
Assume a trial span/ effective depth ration of 32, for continuous one way spanning stair case. d=
4862.5 32
= 151.95mm
Assume T10 bars are to be used. h = 151.95 + 25 +
10 2
= 181.9mm
Hence select the depth of the waist slab as 175mm. Loading (For 1m strip of the staircase) Factor for slope Overlap =