Why shouldn't we march on bridges?

The frequency of the rythemic marching of the soldiers (which is a dynamic load) can coincide with the natural frequency of the bridge deck, causing mechanical resonance. Resonance increases the amplitude of the oscillation of the bridge deck. read more

According to accounts of the time, the bridge broke apart beneath the soldiers, throwing dozens of men into the water. After this happened, the British Army reportedly sent new orders: Soldiers crossing a long bridge must"break stride," or not march in unison, to stop such a situation from occurring again. read more

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