Why did the London Millennium Bridge wobble?
On its opening day, the London Millennium Bridge experienced unexpected swaying due to the large number of people crossing it. A new study finally explains the Millennium Bridge ‘wobble’ by looking at how humans stay balanced while walking. The same pedestrian-structure interaction has also been identified on several other bridges, including Bristol’s famous Clifton Suspension Bridge. The phenomenon is not related to the structural form of the bridge, but rather the behaviour of the pedestrians. The paper by civil engineers at the University of Bristol, published in the Royal Society journal Proceedings of the Royal Society A, examines the basic way humans maintain balance. Balance is achieved by changing the position of foot placement for each step, based only on the final displacement and speed of the centre of mass from the previous step. The same balance strategy as for normal walking on a stationary surface was applied to walking on a laterally swaying bridge. Without altering the
