Transcript Millennium Bridge_Group 12.ppt

Millennium Bridge
Group 12
Introduction
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Opened 10th June 2000
Span 325m Suspension Bridge
What Happened and
Consequences
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Swaying of up to
70mm
Panic and
discomfort
Bridge closed 12th
June 2000
Technical Factors
Contributing to the Disaster
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Horizontal Forces
cause oscillation
Synchronous
Lateral Excitation
Accentuated
oscillation
Lessons To Be Learned
From the Disaster
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Passive Damping
Viscous Dampers
and Tuned Mass
Dampers
Avoid 1.5Hz
natural freq when
building bridges!!