Re: [Phys-l] Why soldiers break step on small bridges, and not so small.

[Bernard Cleyet <bernardcleyet@redshift.com>]

In my link it was more the walkers enjoyed the swaying and contributed to it as one pumps a swing.

It's here too (under resonance):  

http://en.wikipedia.org/wiki/Millennium_Bridge_(London)

bc disappointedly walked on it after the refit.  But:

 it leads to the Tate Modern wherein bc (et Ux.) heard the 2006 sound intallation:

An artistic expression of the higher-frequency resonances within the cables of the bridge were explored by Bill Fontana's 'Harmonic Bridge' exhibition at theTate Modern museum in the summer of 2006. This utilised 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 program Fontana entered into the sound diffusion engine of the Richmond Sound Design AudioBox [2].
[edit]


On 2011, Jul 29, , at 01:44, alex brown wrote:

> As an aside... There was serious problems with the Millenium Bridge when first built.  When the number of people on it reached a critical number the bridge oscillated quite alarmingly... Details found here
>
> http://www.arup.com/millenniumbridge/