Zero shear shear is at 0.6 + (47.08 - 16.80) 16.80) /19.53 = 2.151 2.151 m from left M = 47.08 x 2.1 2.151 51 - 16.80 x 2.151 - 19.53 19.53 x 1.551²/2 1.551²/2 = 41.64 kNm/m d = 200 - 25 - 8 = 167 mm K = 0.0427 As = 599 mm²/m PROVIDE T16 @ 300 B = 670 mm²/m
Enhanced by 8.5 % for deflection L/d = 4,300 /167 = 25.749 25.749 < 20.0 x 1.256 1.256 x 1.050 = 26.375 26.375 allowed allowed
T10 @ 300 T in span OK
Spreadsheets to BS 8110
Project Client
Advisory Group
Location
South Staircase
REINFORCED CONCRETE COUNCIL Made by
LANDING
STAIR FLIGHTS AND LANDINGS to BS 8110:1997 Originated from Beta/trial version of RCC71.xls' on CD
Min bar Ø = 10 Max bar Ø = 16 Nominal top steel ? Y
DIMENSIONS
a = 1200 mm b = 1200 mm c = 250 mm d = 175 mm
depth, h = 175 mm width, w = 1200 mm L = 3000 mm
LOADING
LANDING
Imposed Finishes Slab gk
Flight a reaction 20.87 Flight b reaction 16.91
4.00 1.50 4.13
kN/m² kN/m² kN/m²
79.3 kN ult 74.0 kN ult 66.1 kN/m ult 61.6 kN/m ult n = 1.4 x 5.63 + 1.6 x 4.0 = 14.28 kN/m²
qk
11.16 8.84
kN/m kN/m
n1 = (1.4 x 20.87 + 1.6 x 11.16)/1.20 = 39.23 kN/m² n2 = (1.4 x 16.91 + 1.6 x 8.84)/1.20 = 31.51 kN/m²
DESIGN
Zero shear shear is at (66.11 - 2.50) /(14.28 /(14.28 + 39.23 39.23)) + 0.175 = 1.364 m from left M = 66.11 x 1.3 1.364 64 - 14.28 x 1.364²/2 1.364²/2 - 39.23 x 1.189²/2 1.189²/2 = 49.15 kNm/m kNm/m d = 175 - 25 - 8 = 142 mm K = 0.0696 As = 863 mm²/m PROVIDET16 @ 220 B = 914 mm²/m Enhanced by 3.7 % for deflection T10 @ 325 T in span L/d = 3,000 /14 /142 2 = 21.127 < 20.0 x 1.018 1.018 = 21.450 allowed allowed
OK
Project Location
Spreadsheets to BS 8110 South Staircase STAIR FLIGHTS AND LANDINGS to BS 8110:1997 Originated from Beta/trial version of RCC71.xls' on CD
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Status of spreadsheet Public release version.
Revision history RCC71 Stair Flight & Landing - Single
