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

13.26 kip

Step-by-step 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`