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A expansion joint is a piece of metal in a bridge that allows it to expand and contract with changing temperatures without causing damage to the structure. This helps prevent the bridge from cracking or collapsing under temperature variations.

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1y ago

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Related Questions

Why do oven trays expand and contract?

heat makes metal expand.


How do you make metal contract?

They expand ------- No, normally metals expand when heated.


Does metal expand and contract?

Yes, metal can expand and contract due to changes in temperature. When heated, the metal molecules move more rapidly, causing the metal to expand. Conversely, when cooled, the metal molecules slow down, resulting in contraction.


What is distortion in welding?

it moves Because almost all Elements expand when heated and contract when cooled. As you are welding the metal at that location is trying to expand because of the heat. Ahead of the weld area the metal isn't moving. Behind the weld area the metal is trying to contract as it cools. If the whole weld could be heated at once it would expand then contract at the same rate without distortion.


What does acid rain do to metals?

over a period of time it will make the metal expand and will collapse if it is a bridge or something


What are metals that expand and contract?

Metals expand when heated because when heat touches the atoms they bounce around even more than they already do so they need more space. When you cool a metal it contracts. Would you get closer to someone when your cold?


How can a metal bar be made to expand in all directions?

Heating the metal bar evenly will cause it to expand in all directions. This is known as isotropic expansion, where the material expands uniformly in all dimensions. Heating allows the atoms in the metal to move more freely, causing the entire metal bar to expand uniformly.


Why are there expansion gaps in bridges?

Hot weather causes the metal the bridges are made of to heat up and expand. If there was no space for them to expand then the bridge would either crack it's foundations or tear itself to pieces.


How does temperature make an acoustic guitar out of tune?

The tune of a guitar has got to do with the tension on the metal strings. Temperature causes metal to contract or expand, changing the tension of the strings and thus the tuning.


What are everyday things that expand and contract?

Everyday things that expand and contract include metal objects like coins, which expand when heated and contract when cooled. Rubber bands also expand and contract when stretched or relaxed due to changes in temperature. Additionally, gases such as air expand when heated and contract when cooled, which is why a balloon inflated indoors may shrink when taken outside on a cold day.


Why do metals expand when hot and contract when cooled?

When metals are heated, the atoms within the metal vibrate more rapidly, causing them to take up more space and the metal to expand. When the metal is cooled, the atoms vibrate less, allowing them to move closer together, resulting in contraction. This expansion and contraction is due to the changes in the spacing and movement of the atoms within the metal structure.


What is thermal expansion and contraction?

when your feet go in shoes and then your feet expand and contract so your shoes will not fit.