rcc71 stair flight

7/29/2019 RCC71 Stair Flight

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Project Spreadsheets to BS 8110 REINFORCED CONCRETE COUNCIL

Client Advisory Group Made by Date Page

Location South Staircase FLIGHT rmw 18-Sep-13 106STAIR FLIGHTS AND LANDINGS to BS 8110:1997 Checked Revision Job No

Originated from Beta/trial version ofRCC71.xls' on CD 1999 BCA for RCC - R68

MATERIALS

fcu 35 N/mm gm 1.5 concrete Min bar = 10

fy 460 N/mm gm 1.05 steel Max bar = 16

h agg 20 mm Density 23.6 kN/m

Cover 25 mm (Normal weight concrete) Nominal top steel ? Y

DIMENSIONS Sectional Elevation

a = 600 mm landing A h = 175

b = 2500 mm flight waist = 200

c = 1200 mm landing B h = 200

d = -600 mm

e = -100 mm

Going = 250 mm L = 4300

Rise = 1900 mm total 10 treadsRise = 172.7 mm each step Rake = 34.64

LOADING

Imposed 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

DESIGN

LANDING 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/m

LANDING 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 left

M = 47.08 x 2.151 - 16.80 x 2.151 - 19.53 x 1.551/2 = 41.64 kNm/m

d = 200 - 25 - 8 = 167 mm K = 0.0427 As = 599 mm/m

PROVIDE T16 @ 300 B = 670 mm/m

Enhanced by 8.5 % for deflection T10 @ 300 T in span

L/d = 4,300 /167 = 25.749 < 20.0 x 1.256 x 1.050 = 26.375 allowed OK

chg


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Project Spreadsheets to BS 8110 REINFORCED CONCRETE COUNCIL

Client Advisory Group Made by Date Page

Location South Staircase LANDING rmw 18-Sep-13 107STAIR FLIGHTS AND LANDINGS to BS 8110:1997 Checked Revision Job No

Originated from Beta/trial version of RCC71.xls' on CD 1999 BCA for RCC chg R68

MATERIALS

fcu 35 N/mm gm 1.5 concrete Min bar = 10fy 460 N/mm gm 1.05 steel Max bar = 16

h agg 20 mm Density 23.6 kN/m

Cover 25 mm (Normal weight concrete) Nominal top steel ? Y

DIMENSIONS

a = 1200 mm depth, h = 175 mm

b = 1200 mm width, w = 1200 mm

c = 250 mm

d = 175 mm L = 3000 mm

LOADING

LANDING Imposed 4.00 kN/m 79.3 kN ult 74.0 kN ultFinishes 1.50 kN/m 66.1 kN/m ult 61.6 kN/m ult

Slab 4.13 kN/m n = 1.4 x 5.63 + 1.6 x 4.0 = 14.28 kN/m

gk qk

Flight a reaction 20.87 11.16 kN/m n1 = (1.4 x 20.87 + 1.6 x 11.16)/1.20 = 39.23 kN/m

Flight b reaction 16.91 8.84 kN/m n2 = (1.4 x 16.91 + 1.6 x 8.84)/1.20 = 31.51 kN/m

DESIGN

Zero shear is at (66.11 - 2.50) /(14.28 + 39.23) + 0.175 = 1.364 m from left

M = 66.11 x 1.364 - 14.28 x 1.364/2 - 39.23 x 1.189/2 = 49.15 kNm/m

d = 175 - 25 - 8 = 142 mm K = 0.0696 As = 863 mm/m

PROVIDET16 @ 220 B = 914 mm/m

Enhanced by 3.7 % for deflection T10 @ 325 T in span

L/d = 3,000 /142 = 21.127 < 20.0 x 1.018 = 21.450 allowed OK


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Project Spreadsheets to BS 8110

Location South StaircaseSTAIR FLIGHTS AND LANDINGS to BS 8110:1997 Made by rmw Job No R6

Originated from Beta/trial version of RCC71.xls' on CD 1999 BCA for RCC Date 18-Sep-13

CHOOSE BAR DIAMETERS

FLIGHT LANDING

M 41.64 49.15 Lookup Tablesh 200 175 10 10

assume d = 169 144 8 10 10

K 0.0417 0.0677 10 10 10

z 160.55 132.20 12 12 12

As/m 592.05 848.74 16 16 16

= % 0.3503 0.5894 20 16 16

Clause b? N N 25 16 16

Smax 422.50 360.00 32 16 16

Dia 16 16

10 10

As nom 260 228 8 10 10Dia 10 10 10 10 10

S 300 325 12 12 12

As' prov 262 242 16 16 16

= % 0.1568 0.1702 20 20 20

25 25 25

32 32 32


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Disclaimer

Status of spreadsheet

Public release version.

Revision history RCC71 Stair Flight & Landing - Single

Date Version Action Size (kB

06-Aug-99 RCC71v1.0First public release.

Includes b version comments147

All advice or information from the British Cement Association and/or Reinforced Concrete Council i

intended for those who will evaluate the significance and limitations of its contents and take responsibilit

for its use and application. No liability (including that for negligence) for any loss resulting from suc

advice or information is accepted by the BCA, RCC or their subcontractors, suppliers or advisors. User

should note that all BCA software and publications are subject to revision from time to time and shoul

therefore ensure that they are in possession of the latest version.

This spreadsheet should be used in compliance with the accompanying publication 'Spreadsheets foconcrete design to BS 8110 and EC2' available from British Cement Association, Telford Avenue

Crowthorne, Berkshire RG45 6YS.

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