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Why are soldiers told to break step or not to march in step while crossing a bridge?
Wiki User
∙ 12y ago
The story is that 20 soldiers were injured when the Broughton Bridge (Manchester) collapsed on April 12, 1831. The cause was determined to be a bolt that sheared off from the effects of mechanical resonance. The impact vibrations from the uniform step of the marching soldiers was believed responsible. In other less famous situations, the same type of physical damage has occurred to other structures.
Wiki User
∙ 10y ago
Wiki User
∙ 12y agoThey are told to "break step" because the vibrations of the all the steps marching together may cause the bridge to collapse.
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Why soldiers are told to not march while crossing abridge?
Harmonics. Most bridges are strong enough to support the weight of soldiers marching in lock step, but the constructive vibrations still hasten the need for repairs. Harmonic vibrations induced by the wind brought down the Tacoma Narrows Bridge, "Galloping Gertie."
Why arn't solgers and bands allowed to march over bridges?
Soldiers and bands break step so as not to reinforce the fundamental vibration frequency of the bridge. For an example of wind reinforceing the fundamental frequency look up the Tacoma Narrows Bridge.
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because marching of troops cause small forces(legs) to superimpose into a single large force which causes vibrations and repeated marching provides the resonance frequency and thus it may cause damage to the bridge!
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The possessive form for the plural noun soldiers is soldiers'.Example: The soldiers' march took them across a river.
