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Isolated Footing Design Guide

The document provides calculations to design an isolated square footing located under a column. It determines: 1) The required area of the footing based on the working load and allowable soil bearing capacity, which is 6.858 sqm. 2) The dimensions of a rectangular footing that meets the required area, which is 2.5m x 3.0m or 7.5 sqm. 3) The depth of the footing is selected as 600mm, and the calculated self-weight of 108kN exceeds the minimum requirement. It then checks that the provided footing area and maximum soil pressure are within allowable limits.

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Khalid Banafa
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58 views3 pages

Isolated Footing Design Guide

The document provides calculations to design an isolated square footing located under a column. It determines: 1) The required area of the footing based on the working load and allowable soil bearing capacity, which is 6.858 sqm. 2) The dimensions of a rectangular footing that meets the required area, which is 2.5m x 3.0m or 7.5 sqm. 3) The depth of the footing is selected as 600mm, and the calculated self-weight of 108kN exceeds the minimum requirement. It then checks that the provided footing area and maximum soil pressure are within allowable limits.

Uploaded by

Khalid Banafa
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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7.

4 Calculation sheet of Design of isolated footing


located under column (A)
Loading:
N (kN)

M xx

M yy

(KN.m)
(KN.m)
Ultimate
1820
21
-4
Load
Working
1270
14
-2
Load
Note: Column dimension 600 mm*200 mm

Area of footing:
Determination area of footing:
A=

Nw +self weight of footing


Pb

Where:

Nw

: Working load which transferred from building.

Assume self-weight of footing = 8% of


:. Area required including weight of footing:
A=

N w 0.08 12701.08
=
=6.858 m2
Pb
200

Rectangular Footing (2.53.0) = 7.5

Nw

Determination depth of footing:


Assume h=600 mm

Actual weight of footing = 2.5*3.0*0.6*24 = 108 KN


Actual weight of footing=108 KN > 8 of N w =101.7 KN

16
d max =hcover =60050 =542mm
2
2
d min =d max=54216=526 mm
3

I xx =

LB 3.02.5
=
=3.91m4
12
12

I yy =

B L3 2.53.03
=
=5.625 m4
12
12

Check for area:


area=

( Working Load + self weight )


( soil bearingcapacity )

1270.73+108
=6.89m2 <7.50 m2
200

Check for maximum soil pressure:


:. Total working Load

( N tw )

= (108 +1270.73) = 1378.73 kN.

Working soil stress below base:


P=

N tw (M xx working ) y ( M yy working ) x
+
+
A
I xx
I yy

P=

1378.73 14.63 ( 2.5/2 ) 2.84 ( 3.0/2 )


+
+
7.5
3.91
5.625

189.3 kN /m <200 kN /m

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