5/21/2018 Reinforced Concrete Staircases to Bs 81101997

1/3

Project Spreadsheets to BS 8110 REINFORCED CONCRETE COUN

C lient Advisory Group Made by Date Page

Location North Staircase RMW 23-Jul-14 11

REINFORCED CONCRETE STAIRCASES to BS 8110:1997 Checked Revision Job N

Originated from RCC72.xls on CD 1999 BCA for RCC chg - R6

FLIGHT 5

Waist = 150 mm a = 2.500 m b = 0.600 m c = 0.600 m

L = 3.700 m

Waist 4.20

Steps 1.88

Finishes 0.50

6.57 kN/m n5 = 15.60 kN/m 19.50 19.50

M = 19.50 x ( 1.850 - 0.625 ) = 23.89 kNm/m d = 124 mm K = 0.0444

As = 557 mm PROVIDE 8 T12 @ 150 B = 905 mm L/d = 29.839 < 30.582 allowed O

As increased by 53.6 % for deflection

LANDING 4+7.000 m

h = 150 mm L = 2.800 m

Self wt 3.54 n5 = 16.25 kN/m

Finishes 1.30 n4 = 16.25 kN/m4.84 kN/m nd = 13.18 kN/m 37.95 37.95

M = 37.95 x 1.400 - 12.91 - 14.14 = 26.08 kNm/m d = 124 mm K = 0.0485

As = 611 mm PROVIDE 6 T12 @ 220 B = 679 mm L/d = 22.581 < 23.899 allowed O

As increased by 3.4 % for deflection

FLIGHT 6

Waist = 150 mm a = 2.500 m b = 0.600 m c = 0.375 m

L = 3.475 m

Waist 4.20

Steps 1.88

Finishes 0.50

6.57 kN/m n6 = 15.60 kN/m 18.24 20.77

M = 18.24 x ( 1.769 - 0.585 ) = 21.61 kNm/m d = 124 mm K = 0.0401

As = 502 mm PROVIDE 6 T12 @ 220 B = 679 mm L/d = 28.024 < 29.072 allowed O

As increased by 27.0 % for deflection

LANDING 5+8.750 m

h = 150 mm L = 2.800 m

Self wt 3.54 n5 = 16.25 kN/m

Finishes 1.30 n6 = 15.20 kN/m

4.84 kN/m ne = 13.18 kN/m 37.65 36.99

M = 37.65 x 1.377 - 12.49 - 13.69 = 25.65 kNm/m d = 124 mm K = 0.0477

As = 600 mm PROVIDE 6 T12 @ 220 B = 679 mm L/d = 22.581 < 24.346 allowed O

As increased by 2.7 % for deflection

LANDING 6+10.500 m

h = 150 mm L = 2.800 m

Self wt 3.54 n6 = 27.69 kN/m

Finishes 1.30

4.84 kN/m nf = 13.18 kN/m 26.46 43.66

M = 43.66 x 1.119 - 8.25 - 15.10 = 25.52 kNm/m d = 125 mm K = 0.0467

As = 592 mm PROVIDE 5 T10 @ 160 B = 393 mm L/d = 22.400 < 23.383 allowed O

As increased by 1.0 % for deflection

5/21/2018 Reinforced Concrete Staircases to Bs 81101997

2/3

Project Spreadsheets to BS 8110

Location North StaircaseREINFORCED CONCRETE STAIRCASES to BS 8110:1997

Originated from RCC72.xls on CD 1999 BCA for RCC

CHOOSE BAR DIAMETERS

Flight 1 Flight 2 Landing 1 Flight 3 Landing 2 Flight 4 Landing 3 Flight 5 Landing 4 F

M 15.60 23.89 24.48 23.89 26.08 23.89 26.08 23.89 26.08 2

h 150 150 150 150 150 150 150 150 150

assume d = 124 124 124 124 124 124 124 124 124

K 0.0290 0.0444 0.0455 0.0444 0.0485 0.0444 0.0485 0.0444 0.0485 0

z 117.80 117.55 117.38 117.55 116.92 117.55 116.92 117.55 116.92 1

As/m 302.23 463.94 475.98 463.94 509.10 463.94 509.10 463.94 509.10 4

= % 0.2437 0.3741 0.3839 0.3741 0.4106 0.3741 0.4106 0.3741 0.4106 0

Clause b? N N N N N N N N N

Smax 310.00 310.00 310.00 310.00 310.00 310.00 310.00 310.00 310.00 3

Min spaces 4 4 4 4 4 4 4 4 4

S 277.00 277.00 277.00 277.00 277.00 277.00 277.00 277.00 277.00 2

Dia 10 12 12 12 12 12 12 12 12

6

8 8

10 10

12 12

16 16

20 20

25 25

32 32

5/21/2018 Reinforced Concrete Staircases to Bs 81101997

3/3

Disclaimer

Status of spreadsheet

Public release version.

Revision history RCC72 Stairs & Landings - Multiple

Date Version Action Size (

03-Aug-99 RCC72 v1.0First public release.

Includes bversion comments429

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

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

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

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

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

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

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

Crowthorne, Berkshire RG45 6YS.