Why are bridges placed on rollers?

Answer 1

when we have rollers at one end then it is allowed to expand freely without any thermal stress.in summers the bridges may expand due to the increase in the temperature and in winters the bridges may compress due to decrease in the temperature. the rollers help to increase/decrease the length of the bridge without any thermal stress.

----N.Doraditya

Answer 2

There are two reasons: First, as a bridge deflects under load, the ends rotate a small amount and pull inward. The rocker/roller allows for this movement. To see this happen, take a thin stick, support it at the ends, and push down on the middle; the ends will rotate and pull together a little bit.

Second, a bridge will expand and contract due to temperature changes. This can be as much as one inch for a 100 degree Fahrenheit change in temperature, for a bridge 100 feet long. The rocker/roller lets the bridge expand and contract.

Usually, there will be one "fixed" bearing in a bridge: this anchors the bridge in place. the rest of the bearings will be rollers, or just a segment of a roller, that is, a rocker-shaped support.

Answer 3

There are two reasons: First, as a bridge deflects under load, the ends rotate a small amount and pull inward. The rocker/roller allows for this movement. To see this happen, take a thin stick, support it at the ends, and push down on the middle; the ends will rotate and pull together a little bit. Second, a bridge will expand and contract due to temperature changes. This can be as much as one inch for a 100 degree Fahrenheit change in temperature, for a bridge 100 feet long. The rocker/roller lets the bridge expand and contract. Usually, there will be one "fixed" bearing in a bridge: this anchors the bridge in place. the rest of the bearings will be rollers, or just a segment of a roller, that is, a rocker-shaped support.

Answer 4

They are supported on one end by rollers so that the bridge has more room to expand and contract.

Answer 5

To slow down the cars who were going fast on the bridge so people can prevent accidents to occur

Answer 6

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Answer 7

I have no idea. I need the answer too