• There seems to be an uptick in Political comments in recent months. Those of us who are long time members of the site know that Political and Religious content has been banned for years. Nothing has changed. Please leave all political and religious comments out of the forums.

    If you recently joined the forums you were not presented with this restriction in the terms of service. This was due to a conversion error when we went from vBulletin to Xenforo. We have updated our terms of service to reflect these corrections.

    Please note any post refering to a politician will be considered political even if it is intended to be humor. Our experience is these topics have a way of dividing the forums and causing deep resentment among members. It is a poison to the community. We appreciate compliance with the rules.

    The Staff of SOH

  • Server side Maintenance is done. We still have an update to the forum software to run but that one will have to wait for a better time.

Wobbly Russian Bridge

Cloud9Gal

Cloud9Gal

~Fury of the Winds~


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."





[YOUTUBE]WEQrt_w7gN4[/YOUTUBE]
 
It is...but the clips which show up below when this one has finished, are more so.
Not for discussion here, presumably.
 
Wing_Z said:
It is...but the clips which show up below when this one has finished, are more so.
Not for discussion here, presumably.
Click to expand...

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.
 
That's too bad, I hold Russian engineering in very high esteem.
 
Look at the idiot stood on the damn thing....

Always amazes me what concrete can do given the right circumstances.
 
Definite pattern to the wavy motion, if you watch it a few times. Resonance is something to consider in engineering.
 
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.
 
Wing_Z said:
Still, it is in Bridge Design 101 to run a quick wind check on the deck.
Click to expand...

professor-1.jpg
 
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.
 
give me a flight to Volgograd with my Bike and i'd scoot across that bridge quite happily time after time :jump:
 
You must log in or register to reply here.
Back
Top