London Millennium Bridge Presentation.pptx
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Transcript London Millennium Bridge Presentation.pptx
Mike O’Malley
Kelly Fraher
Francis Kelly
Problems
Swaying noticed
Bridge closed
Already £2.2million over budget - bridge failure
Solutions to problem needed…
1St Solution – Stiffening
(so that the frequency of the bridge and footsteps don’t match)
This option was not feasible
Appearance?
Cost?
Time?
…needed to be at least ten times stiffer
nd
2
Solution - Damping
Passive Damping – only viable option (active dampers
too complex)
2 types: viscous and tuned mass
Viscous – lateral sway (piston in oil…shock absorbers
in cars)
Tuned mass – vertical movement (weights on springs
opposing phase movement of the bridge)…precaution
Conclusions
Since corrected - no problems have occurred