The day the bridge couldn't stand still: 25 years since the Millennium Footbridge closed
Briefly

The Wobbly Bridge, opened on 10th June 2000, faced immediate issues with alarming wobbling that exacerbated with increased foot traffic. Initially blamed on weather and heavy crowd density, investigations revealed that people's synchronized movements were amplifying the bridge's natural sway. Architects and engineers acknowledged the design flaw and the bridge was closed just two days after its unveiling. Repairs took nearly two years and increased the total project cost significantly, raising concerns about pedestrian bridge design and public safety.
The wobble was caused by the way people tend to sway in sync, which amplified the effect of the bridge's natural design to sway slightly.
Despite attempts by architects and stewards to control crowds, the bridge's wobble phenomenon reoccurred, ultimately leading to its closure just two days after opening.
Read at ianVisits
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