I'm seeking an explanation in reference to the photo below. I'm unsure how the solution within the red box calculates the max tension of the Aluminium beam and the max compression off the Aluminium beam.
How are you able to differentiate whether the Aluminium is in tension or compression within this scenario?
As well as how they are able to make the statement that "the steel is entirely compressive bending stress and the max bending stress is at the top of the flange"
Thankyou!