Wobbly Russian Bridge

[Cloud9Gal]

http://www.smileyvault.com/albums/signs/smiley-vault-signs-088.gif (http://www.smileyvault.com/)

Scary to say the least! Yikes!


"Russian authorities shut down a seven-kilometer-long bridge over the Volga River in Volgograd last week after it started to wobble. Floodwaters loosened one support, which affected the stability of the entire bridge, which is the longest in Russia. The video is reminiscent of the Tacoma Narrows Bridge, just before it collapsed. The Volgograd bridge was completed less than a year ago."





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[Wing_Z]

It is...but the clips which show up below when this one has finished, are more so.
Not for discussion here, presumably.

[jmig]

It is...but the clips which show up below when this one has finished, are more so.
Not for discussion here, presumably.

You are correct, sir. :) It would only take about two seconds for such a thread to erupt in flames.

That bridge is scary. Who would think concrete could flex that much and not break. Well, I guess civil engineers.

[tigisfat]

That's too bad, I hold Russian engineering in very high esteem.

[Skittles]

Look at the idiot stood on the damn thing....

Always amazes me what concrete can do given the right circumstances.

[HouseHobbit]

WOW...That is truly scary.. WOW..

[Bjoern]

And that, my friends, is why you should always have good civil engineers *and* enough funds.


General info:
http://en.wikipedia.org/wiki/Volgograd_Bridge

[Piglet]

Definite pattern to the wavy motion, if you watch it a few times. Resonance is something to consider in engineering.

[Wing_Z]

Yes the wind is making eddy currents which oscillate over the deck.
Because they are shedding at the resonant frequency of the deck, the motion amplifies.

Tacoma Narrows was a suspension bridge, which allowed bigger deflections until it broke.
This one is presumably tied down to the bridge bearings - but maybe the flood damaged some piers and magnified the effect.

Still, it is in Bridge Design 101 to run a quick wind check on the deck.

[tigisfat]

Still, it is in Bridge Design 101 to run a quick wind check on the deck.

http://i595.photobucket.com/albums/tt32/walkeramerican/forum%20commentary%20pictures/professor-1.jpg

[Wing_Z]

Ah yes! Professor Farquharson, you yourself described it as aeroelastic flutter in the very first semester course of 1941...perhaps everyone was distracted by other events.

[demorier]

It'd make me seasick passing across that thing.

[tigisfat]

Ah yes! Professor Farquharson, you yourself described it as aeroelastic flutter in the very first semester course of 1941...perhaps everyone was distracted by other events.


http://i595.photobucket.com/albums/tt32/walkeramerican/forum%20commentary%20pictures/professor-2.jpg

[Wild Bill Kelso]

The video is reminiscent of the Tacoma Narrows Bridge, just before it collapsed.

Yep:

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The song remains the same...

[Matt Wynn]

give me a flight to Volgograd with my Bike and i'd scoot across that bridge quite happily time after time :jump: