A $1\mathrm{.}8m$ high square concrete column with and

$\{$:${}_c=9\mathrm{.}9\frac{{10}^{-6}}{}C)$ is reinforced with six $22mm$ steel bars and

$\{$:${}_s=11\mathrm{.}7\frac{{10}^{-6}}{}C).$ The tensile strength of the concrete is $2\mathrm{.}2$MPa. Cracks will

begin to form in the concrete when the axial stress in the concrete reaches this level.

Determine the change in temperature $T$ necessary to cause cracks to develop in the

concrete of this column. Report your answer in $C$ with one decimal place of accuracy.

Indicate an increase in temperature as positive and a decrease as negative.

$T=,C$

What is the axial stress in the reinforcing steel when these cracks develop? Report your

answer in units of MPa with two decimal places of accuracy. Tension is positive and

compression is negative.

${}_s=,$MPa