Question

explain why bridges are declared unsafe after long time​

Answer 1

Answer:

When a bridge is used for long times. It lises its elastic strength. Therefore, the amount of strain in the bridge for a given stress will become large and ultimately, the bridge may collapse. That is why the bridge are declared unsafe after long use.

Answer 2

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Explanation:

When a bridge is used for long times. It lises its elastic strength. Therefore, the amount of strain in the bridge for a given stress will become large and ultimately, the bridge may collapse. That is why the bridge are declared unsafe after long use.