DESIGN OF FOUNDATION COLUMN (SQUARE)

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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
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