The regular strength concrete elastic modulus $Ec=3\mathrm{.}625{10}^6$;$Es=29{10}^6$

and steel reinforcement ratio is $0\mathrm{.}025.$ Cross section dimension is $12$ by $24$ inches.

Initially, just after loading a constant external load $P$ is active. The initial

reinforced concrete column strain $($in$/$in$)$ is measured to be ${350}^{**}{10}^{-6}$ in$/$in$.$

Calculate P external assuming that no time$-$effects have developed yet.

Determine ultimate concrete and steel stresses assuming a creep coefficient of

$C(u)=2\mathrm{.}35$ and ultimate shrinkage strain of $450{10}^{-6}i\frac{n}{i}n.$

Show through calculations that ultimate concrete and steel strains are equal and

explain why.