isolated Footing

Calculation Project

 Atkins Rail Limited Civil Division Sharjah UAE

N/A

Design Element

By

Checked by Ap'd by

 AAS PVSS Job Job No. No. Shee Sheett no. no.

ISOLATED FOOTING

N/A

TITLE

MD Date Date

1

3/5/2014

DESIGN OF ISOLATED / PAD FOOTING

Calculations

Reference

Output

INPUT PARAMETERS 2

Bearing capacity of soil = Column size b x h = f ck

200 300 40

Kn/m x 300 2 N/mm

f y

460

N/mm

1273 611 1884

Kn Kn Kn

1291.2

Kn

2

LOADS Factored Dead Load Factored Live Load Total Factored Load Total Unfactored Load =

2.75 m

1.375

1.225

FOOTING SIZE  Allowing 10% extra over soil displaced by concrete

Required footing\Pad size =  Assuming footing size B x D = hence area provided = Clear cover =  Approximate bar dia =  Average effective depth ' d '=

6.80 2.75 7.56 40 25 0.54

2

m x 2 m mm mm m

2.75

x

0.6

Column size 300 x 300

REINFORCEMENT

3.4.4.4 BS8110-1-1997

2

ULS Design pressure = Moment at face of column = Mu = 0.01 0.0163 633 3 2 f ckbd

249.12 Kn/m 514.03 Kn-m

 Asteel req =

2527.2 mm

Provided reinforcement = Bar spacing for Asteel req =

2826 mm 194.14 mm

2

Providing 9 T20 @ 300

2

2826 mm

2

SHEAR CHECKS 3.4.5.4 BS8110-1-1997

100 As/bd

Ultimate Shear = vc =

Shear capacity at ' d ' from column face 3.11.3.4(1)  Actual shear 3.7.7.1 BS8110-1-1997 Shea Shearr capa capaci city ty at ' 2d ' from from col column umn face face =  Actual shear 3.11.3.4 (2) 3.7.7.2 BS8110-1-1997

Punching shear  V Vmax =

2

0.19

N/mm

0.426

N/mm

2

= =

1254 Kn 472.71 Kn

Footing safe against one way shear 

=

626. 626.8 8 Kn 106.2 Kn

Footing safe against two way shear  2.75 m

= 2. 2 .934579

<

5

N/mm

=

7620

 

u0 r ca per m e e r

p =

+

 Area within critical perimeter Ap=(b+3d)

 =

m m 3.629

Shear on critical perimeter Vcp=P(B2-Ap)

 =

979.9

Shear stress V =Vcp/Cpd

 =

0.24

1.5d

n <

vc

column 300x300

1.5d OK

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Calculation Project

 Atkins Rail Limited Civil Division Sharjah UAE

Design Element

ISOLATED FOOTING

By

Checked by Ap'd by

 AAS PVSS Job No. Sheet no. N/A

TITLE

MD Date

1

3/5/2014

DESIGN OF ISOLATED / PAD FOOTING

Calculations

Reference 3.12.11.2.7

N/A

Output

CRACKING

BS8110-1-1997

100Asreq/bd =

0.17

<

0.3

lc =0.25(3c+9d)=

1375

<

1429

Safe against cracking OK OK Reinforcement uniformely distributed over lc

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