$7\mathrm{.}2\mathrm{.}4,$ EXAMPLE $7\mathrm{.}1($centric axial load$)$

This is the most basic of all foundation designs and should clearly demonstrate the design considerations applicable to most isolated foundations.

A $850250$ column carries a dead load of $900$ kN and a live load of $400$ kN $.$ The allowable soil pressure is $200$ kPa $.$

Design a suitable rectangular base for the column using grade $25/26$ concrete and high tensile reinforcement.

Use grade $30/26$ concrete and high tensile reinforcement and assume that the base is to have a depth of $500$ mm $\mathrm{.}4$