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

PU = 300
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


450
103
= 0.4
20
0.99 Ag + 0.67
415
0.01 Ag





10.70 Ag = 450
103

Ag = 42056.07 mm2
Size of the Column =


= 205. 07 mm = 300 mm
Size of the Column = 300mm
300mm

LONGITUDINAL REINFORCEMENT:
Area of Steel Required = 0.01
Gross Area

= 0.01
42056. 07

= 420. 56 mm2
Provide 10 nos of 16 mm
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

¼
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


3.
300 mm
Provide 6mm
lateral ties @
250 mm c/c


No comments
Post a Comment