Question

Why is there a roller below the bridge on one side?​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

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Explanation:

Roller supports are commonly located at one end of long bridges. This allows the bridge structure to expand and contract with temperature changes. The expansion forces could fracture the supports at the banks if the bridge structure was "locked" in place. ... A roller support cannot provide resistance to a lateral forces.

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