DESIGN OF FOUNDATION COLUMN (SQUARE)
DESIGN
OF FOUNDATION
COLUMN
(SQUARE)
DATA:
Load on the Column (P) = 300
KN
Steel Grade = Fe
415
Concrete Grade = M20
DESIGN CONSTANT:
FCK = 20 N/mm2
FY = 415 N/mm2
DESIGN LOAD:
P = 300 
103
N
103
N
PU = 300
103 1.5
103 1.5
PU = 450
KN
TO GET AG:
Minimum % of steel to be provide
in a R.C. Column = 0.8%
Assume 1% of longitudinal steel in
the column
Area of steel Reinforcement( ASC) = 0.01 Ag
Area of Concrete( AC) =
Ag – 0.01 Ag
AC = 0.99 Ag
PU = 0.4 fck AC
+ 0.67 fy ASC
fy ASC
450 103
= 0.4 20 0.99 Ag + 0.67 415 0.01 Ag
103
= 0.4 20 0.99 Ag + 0.67 415 0.01 Ag
10.70 Ag = 450 103
103
Ag = 42056.07 mm2
Size of the Column =
= 205. 07 mm = 300 mm
Size of the Column = 300mm
300mm
300mm
LONGITUDINAL REINFORCEMENT:
Area of Steel Required = 0.01
Gross Area
Gross Area
= 0.01 42056. 07
42056. 07
= 420. 56 mm2
Provide 10 nos of 16 mm 
bars
bars
Nominal Cover = 40mm
Asc = 452. 38 mm2
DESIGN OF LATERAL TIES:
Minimum diameter laternal is the
greater of
1. ¼
dia of
longitudinal bars
dia of
longitudinal bars
¼
12 = 3 mm
12 = 3 mm
2. 6
mm
Hence adopt 6mm dia lateral ties
PITCH:
1.
The least lateral
dimension of column = 300 mm
2.
16 times of longitudinal bars = 16 16 = 256mm
of longitudinal bars = 16 16 = 256mm
3.
300 mm
Provide 6mm lateral ties @
250 mm c/c
lateral ties @
250 mm c/c
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