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Topic: Minnesota Bridge Collapse, what about the harmonica effect< Next Oldest | Next Newest >
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Post Icon Posted: Aug. 04 2007,2:29 pm Post # 1 see this member send this member a private message  quote this post in reply
What if the construction work had two sets of workers working with jackhammers and the jackhammers created a harmonic effect?  Coupled by the traffic created by the cars, trucks and bus.

The Millennium Bridge, London

The first pedestrian crossing of London’s Thames river in over one hundred years, the Millennium Bridge was conceived as part of the high-profile Millennium Project. Opened on the 10th of June 2000, it was closed again just three days later when it became apparent that the large numbers of people crossing it were causing the whole structure to sway nauseatingly…

The initially small natural vibrations of the bridge encouraged the pedestrians to walk in sync with the movement - which only served to amplify the effect. These vibrations began to occur when there were comparatively few people on the bridge, so by the time there were around 2,000 people on it at once, the wobbling had become pretty dramatic [Youtube link].

Lateral movement of this type in bridges was well known (most famously having caused the complete collapse [Youtube link] of the Tacoma Narrows bridge) - yet this driven harmonic motion caused by the movement of pedestrians remained unanticipated throughout the pre-construction analysis of the bridge.
The Millennium Bridge was closed from June 2000 until February 2002, and even though the problem has now been resolved, it will forever be known simply as The Wobbly Bridge.

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Post Icon Posted: Aug. 04 2007,6:33 pm Post # 2 see this member send this member a private message  quote this post in reply
Interesting.... I saw a similar thing recreated on Mythbusters......

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Post Icon Posted: Aug. 06 2007,10:14 am Post # 3 see this member send this member a private message  quote this post in reply
Time will tell.  Hopefully.  They said that one of the spans was 50 feet out of allinement which seemed to throw them.  

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Post Icon Posted: Aug. 06 2007,9:55 pm Post # 4 see this member send this member a private message  quote this post in reply
They were saying today, they should have it ready to go by this time next year!.. I think the first place they need to inspect is the one that sits right next to the one that took a $shit!.. :rolleyes
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Post Icon Posted: Aug. 07 2007,11:40 am Post # 5 see this member send this member a private message  quote this post in reply
Your statement makes sense.  But I am not sure if they understand sense.

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Post Icon Posted: Aug. 08 2007,6:02 am Post # 6 see this member send this member a private message  quote this post in reply
Quote (David @ Aug. 07 2007,11:40 am)
 But I am not sure if they understand sense.

That would asking quite a bit!.. :rolleyes  :laugh
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Post Icon Posted: Aug. 08 2007,2:11 pm Post # 7 see this member send this member a private message  quote this post in reply
Quote (David @ Aug. 07 2007,11:40 am)
But I am not sure if they understand sense.

They Don't......... It's the Goverment!! :eek  :laugh  :D

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Post Icon Posted: Aug. 08 2007,8:50 pm Post # 8 see this member send this member a private message  quote this post in reply
Quote (Carrera Elite @ Aug. 08 2007,2:11 pm)
Quote (David @ Aug. 07 2007,11:40 am)
But I am not sure if they understand sense.

They Don't......... It's the Goverment!! :eek  :laugh  :D

Ain't that the truth!.. :laugh
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Post Icon Posted: Sep. 18 2008,10:46 am Post # 9 see this member send this member a private message  quote this post in reply
Bridge Reopens

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Post Icon Posted: Sep. 21 2008,10:58 am Post # 10 see this member send this member a private message  quote this post in reply
Amazes me they could replace it within a year when  you look at projects like the bridge by Hoover Dam taking several years.

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Post Icon Posted: Sep. 21 2008,1:59 pm Post # 11 see this member send this member a private message  quote this post in reply
Quote (Ziggy @ Sep. 21 2008,10:58 am)
Amazes me they could replace it within a year when  you look at projects like the bridge by Hoover Dam taking several years.

They don't have Cal-Trans.

"Damn you sure know how to fock things up."-GFR
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Post Icon Posted: Sep. 22 2008,6:08 am Post # 12 see this member send this member a private message  quote this post in reply
Quote (WATERDOG @ Sep. 21 2008,1:59 pm)
Quote (Ziggy @ Sep. 21 2008,10:58 am)
Amazes me they could replace it within a year when  you look at projects like the bridge by Hoover Dam taking several years.

They don't have Cal-Trans.

:good  :laugh  :rotflmao  :beer
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Post Icon Posted: Sep. 22 2008,2:38 pm Post # 13 see this member send this member a private message  quote this post in reply
Quote (GoFastRacer @ Sep. 22 2008,6:08 am)
Quote (WATERDOG @ Sep. 21 2008,1:59 pm)
Quote (Ziggy @ Sep. 21 2008,10:58 am)
Amazes me they could replace it within a year when  you look at projects like the bridge by Hoover Dam taking several years.

They don't have Cal-Trans.

:good  :laugh  :rotflmao  :beer

Sadly, that may be the reason. Two guys workin and ten guys watchin.

"It seemed like a hell of an idea at the time".
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Post Icon Posted: Sep. 23 2008,5:54 am Post # 14 see this member send this member a private message  quote this post in reply
Quote (DirtySquirty @ Sep. 22 2008,2:38 pm)
Quote (GoFastRacer @ Sep. 22 2008,6:08 am)
Quote (WATERDOG @ Sep. 21 2008,1:59 pm)
Quote (Ziggy @ Sep. 21 2008,10:58 am)
Amazes me they could replace it within a year when  you look at projects like the bridge by Hoover Dam taking several years.

They don't have Cal-Trans.

:good  :laugh  :rotflmao  :beer

Sadly, that may be the reason. Two guys workin and ten guys watchin.

That's in they're contract ain't it!.. :D  :laugh
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Post Icon Posted: Sep. 23 2008,7:11 am Post # 15 see this member send this member a private message  quote this post in reply
Quote (GoFastRacer @ Sep. 23 2008,5:54 am)
Quote (DirtySquirty @ Sep. 22 2008,2:38 pm)
Quote (GoFastRacer @ Sep. 22 2008,6:08 am)
Quote (WATERDOG @ Sep. 21 2008,1:59 pm)
Quote (Ziggy @ Sep. 21 2008,10:58 am)
Amazes me they could replace it within a year when  you look at projects like the bridge by Hoover Dam taking several years.

They don't have Cal-Trans.

:good  :laugh  :rotflmao  :beer

Sadly, that may be the reason. Two guys workin and ten guys watchin.

That's in they're contract ain't it!.. :D  :laugh

It must be. That's really all you see with those guys.

"It seemed like a hell of an idea at the time".
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Post Icon Posted: Sep. 23 2008,7:58 am Post # 16 see this member send this member a private message  quote this post in reply
Quote (DirtySquirty @ Sep. 23 2008,7:11 am)
Quote (GoFastRacer @ Sep. 23 2008,5:54 am)
Quote (DirtySquirty @ Sep. 22 2008,2:38 pm)
Quote (GoFastRacer @ Sep. 22 2008,6:08 am)
Quote (WATERDOG @ Sep. 21 2008,1:59 pm)
Quote (Ziggy @ Sep. 21 2008,10:58 am)
Amazes me they could replace it within a year when  you look at projects like the bridge by Hoover Dam taking several years.

They don't have Cal-Trans.

:good  :laugh  :rotflmao  :beer

Sadly, that may be the reason. Two guys workin and ten guys watchin.

That's in they're contract ain't it!.. :D  :laugh

It must be. That's really all you see with those guys.

You'd think their arms would get tired holding a coffee cup for that many hours.

"Damn you sure know how to fock things up."-GFR
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15 replies since Aug. 04 2007,2:29 pm < Next Oldest | Next Newest >

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