Question

one end of a steel girder in a bridge is not fixed but is kept on rollers give the reason

Answer 1

the one end of a steel grider is not fixed because it expand on heating and contract on cooling and due to this the bridge may break or fall so to avoid this small space are left in between for expansion and contraction.

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Answer 2

Answer:

In the construction of a bridge, steel girders are used .One end of the girders is fixed into the concrete or brick pillars and its other end is not fixed , but is placed on rollers.The reason is that if there us any rise ( or fall ) in temperature of the atmosphere, the girder can freely expand ( or contract) without affecting the pillars.

Explanation:

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