Raft Slab Design

Project

REINFORCED CONCRETE COUNCIL Made by

Okey

2-WAY SPANNING INSITU CONCRETE SLABS to BS 8110:1997 (Table 3.14)

Checked

m m

3.16 3.81

h mm 225 Top cover mm 40 Btm cover mm 40 LOADING characteristic Self weight kN/m² 5.40 Pressure kN/m² 55.00 Total Pressure kN/m² 55.00 Imposed, qk kN/m² 0.00 Design load, n kN/m² 49.60

Ø Layer @ As prov = S max Subclause DEFLECTION fs Mod factor Perm L/d

kNm/m mm

mm mm²/m mm²/m mm²/m mm

mm mm²/m % mm

Edge 1 Plan

EDGE CONDITIONS Edge 1 C C = Continuous Edge 2 C D = Discontinuous Edge 3 D Edge 4 D

Ly = 3.81 m

Edge 3

See Figure 3.8 and clauses 3.5.3.5-6

LONG SPAN y

EDGE 1 Continuous

EDGE 2 Continuous

EDGE 3 Free

EDGE 4 Free

BS8110 Reference

0.047 23.4 167.0 0.156 0.034 158.7 378 540 378 12 T1 200 565 0.339 513 (a)

0.034 16.8 167.0 0.156 0.024 158.7 272 540 272 12 T2 200 565 0.339 513 (a)

0.063 31.2 167.0 0.156 0.045 158.2 506 540 ~ 12 B1 200 565 0.339 513 (a)

0.045 22.5 167.0 0.156 0.032 158.7 362 540 ~ 12 B2 200 565 0.339 513 (a)

0.000 0.0 167.0 0.156 0.000 158.7 0 540 ~ 12 B1 200 565 0.339 513 (a)

0.000 0.0 167.0 0.156 0.000 158.7 0 540 ~ 12 B2 200 565 0.339 513 (a)

Table 3.14

183 1.959 50.93

131

244

175

0

0

10

mm

As req As prov T Additional As T req As prov B

Density kN/m³ 24 (Normal weight concrete)

gf= 1.00 gf= 1.00

VALID DESIGN

gc = 1.50 gs = 1.05

SHORT SPAN x

TORSION STEEL

Ø

STATUS

fcu N/mm² 25 fy N/mm² 410

6 Job No

-

© 1999-2003 BCA for RCC

MATERIALS

short span, lx long span, ly

Revision

Edge 4

DIMENSIONS

Page

May.2010

Lx = 3.16 m

Originated from RCC94.xls v2.1

MAIN STEEL ßs M d k' k Z As req As min As deflection

Date

Ground Floor Slab Panel 1

Edge 2

Client Location

3.4.4.4 Table 3.25

% Clause 3.12.11.2.7 Eqn 8 Eqn 7

Actual L/d

18.92

BOTH EDGES DISCONTINUOUS X Y

Asx enhanced 0.0% for deflection control • ONE EDGE DISCONTINUOUS X Y

540

mm²/m mm²/m mm² mm²/m

540

565 0 565

Table 3.10

565 0 565

3.5.3.5

565 0 565

565 0 565

Bottom steel not curtailed in edge strips at free edges

SUPPORT REACTIONS (kN/m char uno) EDGE 1 ßv Dead

kN/m

Imposed

kN/m

Vs

kN/m

(See Figure 3.10)

EDGE 2

EDGE 3

Sum ßvx = 0.786 Sum ßvy = 0.660

EDGE 4

,-

,-

,-

,-

0.472 81.96 0.00 73.9

0.396 68.82 0.00 62.1

0.314 54.64 0.00 49.3

0.264 45.88 0.00 41.4

equations 19 & 20

OUTPUT/SUMMARY PROVIDE MAIN STEEL ADDITIONAL TORSION STEEL X direction Y direction CHECKS Lx > Ly

OK

SHORT SPAN Y12@200 T1

LONG SPAN Y12@200 T2

EDGE 1 ,Y12@200 B1

EDGE 2 ,Y12@200 B2

CORNER 1

CORNER 2

CORNER 3

CORNER 4

EDGE 3 ,Y12@200 B1

EDGE 4 ,Y12@200B2

placed in edge strips

BAR Ø < COVER

SINGLY REINFORCED

MIN SPACING

MAX SPACING

OK

OK

OK

OK

Table 3.15

DEFLECTION

OK

GLOBAL STATUS VALID DESIGN

0

Project

#REF!

Location

2-WAY SPANNING INSITU CONCRETE SLABS to BS 8110:1997 (Table 3.14) Originated from RCC94.xls v2.1

Made by Okey Job No Date May.2010

© 1999-2003 BCA for RCC

APPROXIMATE WEIGHT of REINFORCEMENT SUPPORT WIDTHS (mm)

GRIDLINE

0

0

0

0

WIDTH

300

300

300

300

Spacing

No

Length

Unit wt

Weight

TOP STEEL

Type

Dia

Across grid 0 Across grid 0 Across grid 0

R R R

12 12 12

@ @ @

200 200 200

18 15 18

800 975 850

0.888 0.888 0.888

12.8 13.0 13.6

Across grid 0

R

12

@

200

15

850

0.888

11.3

Along grid 0 Along grid 0 Along grid 0 Along grid 0

R R R R

12 12 12 12

@ @ @ @

200 200 200 200

4 5 3 3

3275 2775 3275 2775

0.888 0.888 0.888 0.888

11.6 12.3 8.7 7.4

Torsion bars

R

10

0

0

0.617

0.0

BOTTOM STEEL Short span - middle edges Long span - middle edges

R R R R

12 12 12 12

15 4 12 4

2725 3425 3425 3925

0.888 0.888 0.888 0.888

36.3 12.2 36.5 13.9

SUMMARY Reinforcement density (kg/m³)

64.3

@ @ @ @

200 200 200 200

Total reinforcement in bay (kg)

190

Disclaimer All advice or information from the British Cement Association and/or Reinforced Concrete Council is intended those who will evaluate the significance and limitations of its contents and take responsibility for its use application. No liability (including that for negligence) for any loss resulting from such advice or informatio accepted by the BCA, RCC or their subcontractors, suppliers or advisors. Users should note that all B software and publications are subject to revision from time to time and should therefore ensure that they ar possession of the latest version.

This spreadsheet should be used in compliance with the accompanying publication 'Spreadsheets for concr design to BS 8110 and EC2' available from British Cement Association, Telford Avenue, Crowthorne, Berks RG45 6YS.

Status of spreadsheet Public release version. Revision history RCC94 Two-way Slabs (Tables)

Date

Version

22-Jan-03

RCC94 v2.1

11-Oct-02

RCC94 v2.0

22-Jun-00

RCC94 v1.3

8-Jun-00

RCC94 v1.2

24-Mar-00

RCC94 v1.1

6-Aug-99

RCC94 v1.0

mation from the British Cement Association and/or Reinforced Concrete Council is intended for valuate the significance and limitations of its contents and take responsibility for its use and iability (including that for negligence) for any loss resulting from such advice or information is BCA, RCC or their subcontractors, suppliers or advisors. Users should note that all BCA blications are subject to revision from time to time and should therefore ensure that they are in latest version.

should be used in compliance with the accompanying publication 'Spreadsheets for concrete 10 and EC2' available from British Cement Association, Telford Avenue, Crowthorne, Berkshire

This spreadsheet is shareware. It may be distributed freely, but may not be used for commercial purposes until the user has registered with the RCC. RCC94 Two-way Slabs (Tables)

Action

Size (kB)

DETR logo replaced by DTI.

206

Version 2 enhancements Orientation warning added at MAIN:Q21 (N Thomas) Conditional formating Main!K10:P19 altered MAIN:D34 etc corrected to include As min. MAIN:F46 moved to correct position, MAIN:D64-D67 reformatted, continuity hatching added to diagram. First public release. Includes b version comments

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