Question

why Space is provided in steel bridges.​

Answer 1

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Explanation:

Most bridges have somewhat of an arch, but they would be similar if they were flat. When a heavy truck drives across a bridge, it will tend to flatten the bridge slightly, and thus making it slightly longer. Or, if the bridge was flat, it would create a bow, and shorten it slightly. Then when the truck leaves the bridge, the bridge will return to its former shape.

Wind may also move the bridge back and forth slightly, also lengthening and shortening it somewhat.

Answer 2

Answer:

In steel bridges one end is made to rest on rollers with enough space provided for expansion during summer. In this way the bridges can move forward or backward during expansion or contraction. If there is no expansion gap, bridges may get damaged.