The concrete $[E=29$GPa $]$ pier shown in the figure is reinforced by four steel $[E=200$GPa $]$ reinforcing rods, each having a diameter of $22mm.$ Assume $P=770kN,L=1\mathrm{.}30m,$ and $a=280mm.$ If the pier is subjected to an axial load of $770kN,$ determine

$($a$)$ the normal stress $($positive if tensile and negative if compressive$)$ in the concrete and in the steel reinforcing rods.

$($b$)$ the deflection of the upper end of the pier $($positive if downward and negative if upward$).$