Steel rods are used to reinforce concrete without any problems caused by changing temperatures-Why is this?

Question

Why is this?
Shouldn't the steel rods expand due to heat?

Answer 1

This is because the coefficients of expansion of concrete and steel are almost equal
ie steel = 35x10^-6 , concrete = 36x10^-6
which means that they both expand and contract at the same rate

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Answer 2

Concrete is reinforced with steel rods not because it expands or contracts, but to simplify it–concrete absorbs the strenght of the steel used to reinforce it. It's the transfer of energy. They act as one. Another example is a pipe with concrete inside, a reverse of your example. Since they act as one, they expand or contract as temperatures change.

Answer 3

Everything expands due to heat... Steel rods and concrete too.

http://simscience.org/cracks/advanced/temp_loads.html

Answer 4

Could it be because of the insulating abilities of the concrete mass? Also at ambient temperatures there isn't enough of a difference to make any noticeable difference to the metal's density. After all, unless in a fire the building, is unlikely to experience a temperature fluctuation of more than about 50C or 100F.

Answer 5

What you state is not quite true,,,,,,,steel rods do cause problems they corrode, they collect condensation and that drips into the structure of the building...
You question could be answered by the leeway built into the structure of buildings for movement, expansion, contraction etc...
Someone else will be able to be more specific.

Answer 6

no steel expands less than other metals it is denser, and the concrete acts as an insulator. Concrete thickness in building codes is 3 inches around the steel to create the insulation effect to prevent expansiona nd shrinking

Answer 7

They both expand with heat and shrink with cold. Together they make a body strong.
Like the bones in your own body, without them, you would fall down.