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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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Q: Why soldiers are not advised to do march past on the suspension bridge?
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Related questions

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.


When was The Bridge made?

the 17th of march 1973


What month do soldiers hate?

forward march


How long ago did the Sydney Harbour Bridge open?

The Sydney Harbour Bridge opened in March 1932. In March 2015, it will have been 83 years since e bridge was opened.


What is the possessive form of ''soldiers''?

The possessive form for the plural noun soldiers is soldiers'.Example: The soldiers' march took them across a river.


What months do the soldiers hate?

march


What is a soldiers favorite month?

march


Can a marching army collapse a bridge?

It is unlikely for a marching army to collapse a bridge unless the bridge was already structurally compromised. The weight distribution of marching soldiers is typically spread out enough to not generate enough force to collapse a bridge.


Why are soldiers told to break step or not to march in step while crossing a bridge?

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.


When the London bridge was made?

the 17th of march 1973


What is the age of the harbor bridge?

The Harbour Bridge was opened on March 19, 1932. Today, the bridge is 82 years old.