give a reason why a concrete beam reinforced with steal does not crack when subjected to changes in temperature

Answer 1

This because steel and concrete have the same rate of expansion  in the reactivity series

Answer 2

Because they have the same rate of expansion

Answer 3

Because has same rate of expansion and contraction

Answer 4

This is because steal and concrete have the same linear expansivity hence when temperature changes they have the same rate of expansion and contraction