$4\mathrm{.}5$ Design the foundation of a frame rectangular column of dimensions $300mm900mm$ and subjected to an axial service load of $500kN$ and a bending moment of $200kN.m$ at the ground level. The frame column is provided with $8T22mm$ on the compression side. The footing is at $1\mathrm{.}5m$ below the ground level.

Given: $q_{\text{a}\text{l}\text{l}}=200k\frac{N}{m^2}$ Base width is limited to

${?}_{21}^1$ nof $2$