Question

A steel column if ISHB 350@ 72.4 kg/m is subjected to factored axial compressive load of 2000 kN. The load is transferred to a concrete pedestal of grade M20 through a square base plate. Consider bearing strength of concrete as
0.45 fck. where fck is the characteristic strength of concrete. Using limit state method and neglecting the self weight of base plate and steel column, the length of a side of the base plate to be provided is ______.

Answer 1

Factored axial load = 2000 kN
As self weight of base plate and steel column is neglected.
Total load on pedestal = 2000 kN
Bearing capacity of concrete
= 0.45 x 20 = 9 MPa
$Areaofsteelbaseplate=\frac{2000\times {10}^3}{9\times {10}^6}=2222.22c{m}^2$

$Sideofbaseplate=\sqrt{2222.22}=47.14cm$

So, length of base plate will be 48 cm.