(Solved): A steel column of hollow circular cross section is supported on a circular steel base plate and a c ...

A steel column of hollow circular cross section is supported on a circular steel base plate and a concrete pedestal. The column has outside diameter $\mathrm{d}=200\mathrm{mm}$ and supports a load $\mathrm{P}=625\mathrm{kN}$. (a) If the allowable stress in the column is $48\mathrm{MPa}$, what is the minimum required thickness, $t$ ? Based upon your result, select a thickness for the column. (b) If the allowable bearing stress on the concrete pedestal is $10.5\mathrm{MPa}$, what is the minimum required diameter, $\mathrm{D}$, of the base plate if it is designed for the allowable load ${\mathrm{P}}_{\text{allow }}$ that the column with the selected thickness can support?