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Friday Bridge Blogging

by PeWi Sun Nov 6th, 2005 at 11:45:47 AM EST

Sorry for the late and very short posting - had a rather "interesting" AGM today.

so I feel rather...

wobbly...


well there is another reason why: the London Millenium Bridge deserves a mention today. And I wanted to unearth the mathematical quote, but I found some pretty pictures instead.

with some biiiiiiiiig video footage of the wobbling which I had actually never seen.

So, across which bridge did you wobble today?

Thank you for the images :

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oh, there was another reason, why:


Wobble of Millennium Bridge Solved

When crowds of people first crossed London 's Millennium Bridge, the structure swayed so violently it had to be closed.

Mathematician Steven Strogatz of Cornell University has now developed a mathematical description of the bridge's tendency to wobble as people walk across it.

It is based on the same 'chaos' mathematics used to understand synchronous behaviour in fireflies and brain cells. The equations should allow civil engineers to prevent the same thing happening to other bridges.

from here, but more here as well

by PeWi on Thu Nov 3rd, 2005 at 07:39:02 PM EST
Some pictures of the Alaska Way in Seattle, which came to my notice because Washington state is currently discussing (hey, even running a referendum) on whether to eliminate the gas tax which was voted earlier this year to, among other things, pay for the renovation (and the earthquake proofing) or replacement of that heavily trafficked bridge:

So with an old, earthquake threatened bridge, wobbly definitely applies, I suppose...



In the long run, we're all dead. John Maynard Keynes

by Jerome a Paris (etg@eurotrib.com) on Fri Nov 4th, 2005 at 05:50:58 AM EST
Good call!  That bridge is definitely wobbly.  It was actually damaged in the last big earthquake and should probably have been replaced already.  Instead, because our state budget is so tight, we're still using it and hoping nothing happens.

Maybe we can eventually make language a complete impediment to understanding. -Hobbes
by Izzy (izzy at eurotrib dot com) on Fri Nov 4th, 2005 at 01:59:10 PM EST
[ Parent ]
I just now saw this on dKos.  NWprogressive wrote a diary about a demonstration there.  It has some photos, too.

Maybe we can eventually make language a complete impediment to understanding. -Hobbes
by Izzy (izzy at eurotrib dot com) on Fri Nov 4th, 2005 at 02:35:00 PM EST
[ Parent ]


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