Four identical hollow cylindrical columns of mild steel support a big structure of mass 50 × 10^3 kg. The inner and outer radii of each column are 50…

Four identical hollow cylindrical columns of mild steel support a big structure of mass $\displaystyle 50 \times 10^3 \mathrm{~kg}$. The inner and outer radii of each column are $\displaystyle 50$ cm and $\displaystyle 100$ cm respectively. Assuming uniform local distribution, calculate the compression strain of each column. $$\text { [use } \mathrm{Y}=2.0 \times 10^{11} \mathrm{~Pa}, \mathrm{~g}=9.8 \mathrm{~m} / \mathrm{s}^2 \text { ] } $$