sábado, 12 de setembro de 2009

VIBRATION OF THE LONDON MILLENIUM BRIDGE





TMD-Tuned-mass dumper




TMD- Tuned- mass dumper


Amortecedores viscosos linerares



When the London Millennium footbridge was opened in June 2000, it swayed alarmingly. This generated huge public interest and the bridge became known as London’s “wobbly bridge”. Part 1 of this paper explains how pedestrians unwittingly caused the bridge to self-excite. Although previously documented, this phenomenon was not well-known.

The introduction of damping by a combination of frame-mounted viscous dampers and tuned-mass vibration absorbers has cured the London Millennium Bridge’s famous wobble. It was caused by synchronous lateral excitation from pedestrians, a phenomenon that was not well-known at the time but for which there is now a good understanding and good data.


Part 1 :Cause
http://www2.eng.cam.ac.uk/~den/ICSV9_06.htm

Part 2 :Cure
http://www2.eng.cam.ac.uk/~den/ICSV9_04.htm

ARUP- Consulting Engineers ,Desiners ,Planners and Project Managers
http://info.arup.com/millenniumbridge

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