Kattumaanap Poriyaalar october 2013 | Page 22

Design Table of Isolated Footings :
: M20
: Fe 500 TMT bars
: 50mm (bottom) & 75mm (Sides)

Grade of Concrete
Steel
Cover

S B C of Soil =

100 KN / m2

200
300
400
500

1.50
1.90
2.10
2.40

x
x
x
x

1.50
1.90
2.10
2.40

Least
dimension
of Column
Pedestal
cm
30
40
40
40

600
800
1000
1250
1500

2.60
3.00
3.40
3.70
4.10

x
x
x
x
x

2.60
3.00
3.40
3.70
4.10

40
40
50
50
60

60
65
70
80
80

20
20
20
20
20

15.0
19.7
23.5
30.3
32.9

14-12y
18-12y
12-16y
16-16y
17-16y

110
130
145
160
175

1750
2000
2250
2500
2750
3000

4.40
4.70
5.00
5.30
5.50
5.80

x
x
x
x
x
x

4.40
4.70
5.00
5.30
5.50
5.80

60
60
60
60
70
70

90
100
110
120
120
125

30
30
30
30
30
30

38.4
44.3
50.5
56.2
58.9
65.2

20-16y
23-16y
26-16y
27-16y
30-16y
33-16y

190
205
220
235
240
255

Load
“KN”

Footing
Size LxB
“m”

D
cm

Do
cm

Reinforcement
Area in each
Direction
“cm2”

Reinforcements
on both
Directions

Development
Length
available
“cm”

30
35
40
45

20
20
20
20

5.57
7.73
9.7
11.9

8-10y
10-10y
13-10y
15-10y

60
75
85
100

Note : y – denotes Fe500 TMT bars

Design Table of Isolated Footings :
: M20
: Fe 500 TMT bars
: 50mm (bottom) & 75mm (Sides)

Concrete
Steel
Cover

S B C of Soil =

150

KN / m2

200
300
400
500

1.30
1.50
1.80
2.00

x
x
x
x

1.30
1.50
1.80
2.00

Least
dimension
of Column
Pedestal
cm
30
30
30
40

600
800
1000
1250
1500

2.10
2.50
2.80
3.00
3.40

x
x
x
x
x

2.10
2.50
2.80
3.00
3.40

40
40
50
50
60

50
60
60
70
75

20
20
20
20
20

10.80
14.30
18.10
20.5
25.5

14-10
13-12
17-12
19-12
23-12

y
y
y
y
y

85
105