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Most bridges have one fixed end and a rolling-end; this is because the rolling end is to compensate and accommodate expansion and contraction of the bridge without causing any distress to the structure and material. The end that is fixed is needed to control the movements on the bridge; travelling vehicle(s) etc.

Chatkrit S.

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13y ago
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8y ago

It's to allow for expansion and contraction of the steel - depending on the temperature of the place where it's constructed. Like other metals, steel expands in warm weather and contracts in cold. Leaving one end of the bridge unfixed, allows the main girder to 'flex' with the temperature changes.

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Q: Why one end of a steel girder bridge not fixed?
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