Project Spreadsheets to BS 8110 Client Advisory Group Made by Date Page Location South Staircase FLIGHT rmw 8-May-15 140

STAIR FLIGHTS AND LANDINGS to BS 8110:2005 Checked Revision Job NoOriginated from RCC71.xls' v4.0 on CD 2006 TCC - R68

MATERIALSfcu 35 N/mm m 1.5 concrete Min bar = 10fy 500 N/mm m 1.15 steel Max bar = 16

h agg 20 mm steel class ACover 25 mm Density 23.6 kN/m Nominal top steel ? Y

(Normal weight concrete) DIMENSIONS Sectional Elevation

a = 600 mm landing A h = 175b = 2500 mm flight waist = 200c = 1200 mm landing B h = 200d = -600 mme = -100 mm

Going = 250 mm L = 4300Rise = 1900 mm total 10 treadsRise = 172.7 mm each step Rake = 34.64

LOADINGImposed 4.00 kN/m 47.08 kN/m ult 37.81 kN/m ult

Flight finishes 1.60 kN/m (20.87 + 11.16) (16.91 + 8.84)Landing finishes 1.30 kN/m

DESIGNLANDING A, gk = 4.13 + 1.30 = 5.43 kN/m n = 1.4 x 5.43 + 1.6 x 4.0 = 14.00 kN/m

FLIGHT, gk = 7.78 + 1.60 = 9.38 kN/m n = 1.4 x 9.38 + 1.6 x 4.0 = 19.53 kN/mLANDING C, gk = 4.72 + 1.30 = 6.02 kN/m n = 1.4 x 6.02 + 1.6 x 4.0 = 14.83 kN/m

Zero shear is at 0.6 + (47.08 - 16.80) /19.53 = 2.151 m from leftM = 47.08 x 2.151 - 16.80 x 2.151 - 19.53 x 1.551/2 = 41.64 kNm/md = 200 - 25 - 8 = 167 mm K = 0.0427 As = 604 mm/m

PROVIDE H16 @ 280 B = 718 mm/mEnhanced by 17.9 % for deflection H10 @ 300 T in span

L/d = 4,300 /167 = 25.749 < 20.0 x 1.235 x 1.050 = 25.930 allowed OK

chg

The Concrete Centre