Part A

Column $AB$ is made from high strength pre$-$cast concrete and reinforced with four $\frac{3}{4}$ in$.$ diameter A$-36$ steel rods. Set $P=75$ kip $.$ The modulus of elasticity for high strength concrete is $4\mathrm{.}2{10}^3$ksi and for A$-36$ steel is $29{10}^3$ksi. $($Figure $1)$

Figure

$1$ of $1$

Determine the average normal stress developed in the concrete.

Express your answer to three significant figures and include the appropriate units. Enter negative value in the case of compression and positive value in the case of tension.

${}_{\text{c}\text{o}\text{n}}=$

$$

$?$

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Part B

Determine the average normal stress developed in each rod.

Express your answer to three significant figures and include the appropriate units. Enter negative value in the case of compression and positive value in the case of tension.

${}_{st}=$

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