I35W Bridge Collapsed in Minneapolis
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One small crack that went unnoticed and then went through several Freeze/Thaw cycles could easily cause enough damage to take down a bridge. Otherwise I'd say it easily might have had something to do with the construction. Chuck we heard that too and the thought of a jackhammer being able to take down a bridge is absurd, it's just a bunch of idiots caught up in the moment. The people that reported it were on the bridge next to the place being hammered so of course the bridge would be shaking/vibrating close to that.
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The jackhammer alone could not take down the bridge, this is 100% true, but IF the jackhammer where causing reverberation across the entire bridge at precisely the right frequency AND if the cars were traveling at the exact right speed to amplify/spread the vibration across the bridge there is about a 1 in a trillion chance that it could have AIDED in the falling of the bridge
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The concrete ties the steel structure together. The steel itself is generally flimsy without the concrete and rebar that is above it.
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thats really fucked up, i heard about this last night while i was at trap shooting. when i first heard about it my first thought was sizemic (sp) activity, then i heard it wasnt
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If you guys haven't seen it, there are like 20-30 workers jack hammering, and then those big pile driving machines too everyday....
Not sure if that changes your opinion on what maybe could have happened... not to mention that it was bumper to bumper traffic.
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Jim;179180 wrote:
If you guys haven't seen it, there are like 20-30 workers jack hammering, and then those big pile driving machines too everyday....Not sure if that changes your opinion on what maybe could have happened... not to mention that it was bumper to bumper traffic.
That's probably what it was. The traffic alone was probably a strain, and when you add that many jackhammers and everything else it probably just couldn't handle it.
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they listed this bridge as a 50 out of 100 bridge and considered it sound, well apparently it wasnt very sound. the inspections showed it was deteriorated enough that it needed more inspections and possibly replacement in the future. i would immagine being a span that some cracks that went un noticed split and it dominoed.
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The bridge was found in a report structurally unstable for heavy traffic and trains at the same time. a jack hammer will cause no harm to the structure of the bridge.(unless your doing it on supports or something) ive been watching the news off and on all day and there are only 4 deaths so far with 79 people in the hospital. the sad part about it is they havent started diving yet do to the settling debris.
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Jackhammers, packed full of cars, AND a train underneath it could all cause quite a bit of vibration.
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atleast 40-50 is the early reports.
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tjamz;179162 wrote:
The jackhammer alone could not take down the bridge, this is 100% true, but IF the jackhammer where causing reverberation across the entire bridge at precisely the right frequency AND if the cars were traveling at the exact right speed to amplify/spread the vibration across the bridge there is about a 1 in a trillion chance that it could have AIDED in the falling of the bridgeok i had to say this... do you seriously just think up random shit. i jackhammer is not going to do shit. how does a car reverberate jackhammer movements?
they had some guy that is a safety inspector and he said it was prolly cracking and that it finally just gave way. he also said that the roadway had nothing to do with it's strenght so the work being performed had little effect on the collapse.
but i will leave the cause up in the air as i have no clue how it fell down.
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DrifterExtreme;179208 wrote:
ok i had to say this... do you seriously just think up random shit. i jackhammer is not going to do shit. how does a car reverberate jackhammer movements?they had some guy that is a safety inspector and he said it was prolly cracking and that it finally just gave way. he also said that the roadway had nothing to do with it's strenght so the work being performed had little effect on the collapse.
but i will leave the cause up in the air as i have no clue how it fell down.
To answer your questions one at a time here:
No, I do not think up random shit.
**IF **jackhammer is causing a slight ripple that is traveling at the same frequency as the cars, the cars would essentially push the wave taller and taller. I learned this basic principle in highschool physics.
I also have no way of proving/disproving my statements, hence the 1 in a trillion guesstimate.
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civic91;179214 wrote:
i dont know about bumper to bumper because there wasnt that many cars on the parts that didnt completly fell but they could have moved off idk. i just think that you would have seen more cars parked on the edge.... dude it was bumper to bumper, the rest of the cars are underneath the rubble.
Have you ever been in that construction zone during rush hour?
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http://www.in-forum.com/pdfs/bridges_opt.pdf
Report on the bridge in 2001.....
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