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In the case of the Millennium Bridge, because the lateral motion caused the pedestrians loading the bridge to directly participate with the bridge, the vibrational modes had not been anticipated by the designers.
The crucial point is that when the bridge lurches to one side, the pedestrians must adjust to keep from falling over, and they all do this at exactly the same time.
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The bridge has not been subject to significant vibration since.
In spite of the successful fix of the problem, the affectionate "wobbly bridge" epithet remains in common usage among Londoners.
Londoners nicknamed the bridge the "Wobbly Bridge" after pedestrians experienced an alarming swaying motion.
The bridge was closed later on opening day and, after two days of limited access, for almost two years while modifications were made to eliminate the motion. The southern end of the bridge is near the Globe Theatre, the Bankside Gallery, and Tate Modern, while the northern end of the bridge is next to the City of London School below St Paul's Cathedral.
On the day of opening, the bridge was crossed by 90,000 people, with up to 2,000 on the bridge at any one time.
Resonant vibrational modes due to vertical loads (such as trains, traffic, pedestrians) and wind loads are well understood in bridge design.
An artistic expression of the higher-frequency resonances within the cables of the bridge were explored by Bill Fontana's 'Harmonic Bridge' exhibition at the Tate Modern museum in mid-2006.
This used acoustic transducers placed at strategic locations on the cabling of the Millennium Bridge and the signals from those transducers were amplified and dynamically distributed throughout the Turbine Hall of the Tate by a programme which Fontana entered into the sound diffusion engine of the Richmond Sound Design Audio Box.
The design of the bridge was the subject of a competition organised in 1996 by Southwark council and RIBA Competitions.Tags: Adult Dating, affair dating, sex dating