Question

Why are the bridges declared unsafe after long use?
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Answer 1

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A bridge during its use undergoes alternating stresses and strains for a large number of times each day, depending upon the movement of vehicles on it. When a bridge is used for long time, it loses 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 bridges are declared unsafe after long.

Answer 2

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☑️◾️If the bridge is used for a long time, due to alternate cycles of stress and strain the bridge gradually loses its elastic property and finally reaches to a condition called elastic fatigue.Hence,bridges are declared unsafe after long use.

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