Question: A highway overpass was observed to resonate as one full loop (½ λ) when a small earthquake shook the ground vertically at 4.0 Hz. The

A highway overpass was observed to resonate as one full loop (½ λ) when a small earthquake shook the ground vertically at 4.0 Hz. The highway department put a support at the center of the overpass? Earthquakes rarely do significant shaking above 5 or 6 Hz. Did the modifications do any good?

Before modification Added support After modification

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