Question

A set of steel reinforcing rods is to be stretched axially in tension to create a tensile stress of 30 ksi prior to being cast in concrete to form a beam. Determine how much force will be required to stretch them

Answer 1

Answer:

13.26 kip

Explanation:

Taking diameter of the rods as 0.75 in then considering that stress is Force per unit area

Force is a product of force and area

$F=A\sigma$ where $\sigma$ is stress

$A=\pi \frac {d^{2}}{4}$ and substituting this into the equation of force we get

$F=\pi \frac {d^{2}}{4}$

Force, $F=30*pi*\frac {0.75^{2}}{4}=13.26 kip$