Remember the "Fixed" Can Opener Bridge? 2

[StrucDesignPE]

Reference this thread:

https://www.eng-tips.com/viewthread.cfm?qid=459466

Bridge was raised 8" from a height of 11'-8" to 12'-4" back in the fall of 2019. Well, looks like it is still working as good as always.

https://www.youtube.com/watch?v=HR5MlZHA1fo&ab_channel=yovo68

I especially like when the truck driver gets out of the truck at 0:45 to survey the damage. Not like he ignored the "OVERHEIGHT, MUST TURN" warning sign.

 

[marty007]

You can build a bridge taller, but the world will always find a taller dummy.

 

[LittleInch]

Now it just peels the top bit off. Before it used to stop the truck dead in its tracks. That's progress no?

Maybe it was empty...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[ACtrafficengr]

It's still more than a foot under legal height (13' 6"). At best. raising it to 12' 4" would reduce the frequency of impacts.

My glass has a v/c ratio of 0.5

Maybe the tyranny of Murphy is the penalty for hubris. -

http://xkcd.com/319/

 

[dgallup]

Does a really clean job of pealing that roof off. If that was the first hit in nearly a year then it's progress.

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[stevenal]

Note that the truck did not strike the bridge. The new crashbeam did it's job protecting the bridge. Not an engineering failure, but success.

 

[kjoiner]

Hello,

I saw this video with a similar result between a train and a low bridge. About a minute into the video you see what was was damaged.

https://www.youtube.com/watch?v=oOpf-xw9FNU

Kyle

 

[thebard3]

kjoiner-
I saw that and wondered--
How does the railroad NOT know that their train is taller than the overpasses on the route? It's not like the engineer made a wrong turn.

Brad Waybright

The more you know, the more you know you don't know.

 

[EdStainless]

It was even another rail line. This is all in their routing system. Someone chose to over-ride the routing information.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[Latexman]

Note that the truck did not strike the bridge. The new crashbeam did it's job protecting the bridge. Not an engineering failure, but success.

So, not "Fixed", just "New and Improved".

Good Luck,
Latexman

 

[dgallup]

If you look really closely, there was a little bit of the truck that grazed the bridge too. Looks like the beam and the bridge are at virtually the same height. So the beam did it's job to protect the bridge without doing unnecessary damage.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[IRstuff]

This is a substantial improvement over previous, which would have completely broken the truck's rear section altogether, although, it's unclear whether there's an substantial difference in repair cost. Nevertheless, that was a thing of beauty from the zippering of truck roofs perspective.

The very start of the train video is interesting, since the roof on that auto carrier section was already pushed to the end of the section, so it's unclear when that actually happened.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

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[itsmoked]

Re: Train peel.

The train coasted to a stop peeling that first car top which attracted the videographer.
As the train stopped it relaxed back creating the smallish gap between the peel and the bridge.

Then we show up to see the train commence moving again.

That was all caused by dispatch sending that train down an unacceptable route.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[HorsieJuice]

Not like he ignored the "OVERHEIGHT, MUST TURN" warning sign.

That sign is terrible. I didn't even notice it at first. Why the hell would you put a danger sign like that in between two green traffic lights and not have them sync'ed together?

 

[IRstuff]

It's a design for success system, i.e., the only other way to do this would be to force the lights to stay red until the knucklehead turns, but that would block traffic.

TTFN (ta ta for now)
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[stevenal]

It's not the only sign. See Street View.

 

[bones206]

I would argue that the crash scene blocks traffic much longer than a red light would. Syncing the red light with the overheight sign seems like a decent idea.

 

[IRstuff]

The issue is that if the truck is 3 cars back, the red light prevents the cars in front from getting out of the way of the truck, so everything winds up deadlocked.

One slightly complicated option would be to drop a crossing gate and force everyone in front of the truck and the truck to turn.

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[LittleInch]

The problem with that location as I recall from the previous thread is that the junction at which over height vehicles turn is only just before the bridge itself. SO if the lights turn red then the truck can't turn left or right which is what they might do anyway. I think it also points just south of west so probably you can't see the sign against a low sun. Would be interesting to konw what time of day a lot of the incidents took place.

Even from two blocks away you have signs and you can see the bridge in the distance looking rather low.

If you're driving a truck and don't think about your height before you get there they would probably run a red light too.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Compositepro]

Many of the trucks that hit the bridge are rental trucks. The drivers probably forget about what they are driving. I run into that problem when towing a trailer, sometimes.