A pedestrian bridge's catastrophic wobble revealed that crowds don't need to march in lockstep to trigger structural collapse—just walk normally, and physics does the rest. The post About 90,000 people crossed London’s new Millennium Bridge on the day it opened in June 2000, with as many as 2,000 on the deck at once, and it swayed so badly it closed days later; subsequent work found that as few as 160 pedestrians could trigger the instability, and the fix was a system of dampers installed on the bridge. appeared first on Space Daily .
About 90,000 people crossed London’s new Millennium Bridge on the day it opened in June 2000, with as many as 2,000 on the deck at once, and it swayed so badly it closed days later; subsequent work found that as few as 160 pedestrians could trigger the instability, and the fix was a system of dampers installed on the bridge.
