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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.

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6d ago
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14y ago

A column of soldiers will never march across a bridge for this reason. The steady oscillation that occurs can, over time cause structural issues with even a well built bridge. It may not actually collapse (although not out of the question) but it can cause serious damage if the marching approaches the resonant frequency.

The classic example of resonant frequency that every engineer has had to watch the video of is the Tacoma narrows bridge. There are also many examples that Tesla explained on this subject.

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Q: Can a marching army collapse a bridge?
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