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Another cable-stayed Bridge in Colombia. 3

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X4vier

X4vier

Civil/Environmental
Feb 24, 2018
157
After this bridge collapse in my country..
[URL unfurl="true"]https://www.eng-tips.com/viewthread.cfm?qid=434353[/url]
Now we bring the "Hisgaura Bridge" that folds up and down like an accordion.

The national news begins with this document leaked through Whatsapp.
[link Informe Fotográfico][/url]

What do you think ? It's only cosmetic or its form can lead to it's failure.
[link Anexo][/url]
 
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Within tolerance maybe? :)

Wiggle_Bridge_uhp2om.jpg


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faq731-376
 
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Well, a load test should of course be performed, and a very complete and satisfying one. But before, those undulations should be explained and repaired: are they due to an incorrect tension of the cables?
And of course there is a risk of failure, the side beams are under compression and could fail due to the bending and/or instability imparted by the undulations. However to really judge the full static model of the bridge should be known (e.g. where are the expansion joints located?)

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Looks like it's a little out of tune is all.
 
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Integrated speed bumps?

Bill
--------------------
"Why not the best?"
Jimmy Carter
 
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Load test postponed:
I think the photo posted is misleading. Then undulations seen above are intentional, as seen in the photo below. The concrete is cast with those angles, but the concrete appears to have needed repairs. However, the second attached photo shows the roadway with a rather disturbing cant, as well as undulations.
bridge_facade_z2sxwu.jpg

bumps_lwaodr.jpg


TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! faq731-376 forum1529 Entire Forum list
 
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I couldn't open the attachment. the accented A appears as a strange symbol which may be preventing download? Try again without it?

that's a very odd picture alright.

Excessive tendon stretch?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
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The famous Millau Viaduct in France was a bit twisted before they brought it into alignment (not as bad as the subject of this thread). I recall this detail from a documentary on the subject (PBS Nova?).

Here's a picture (scroll down, about halfway down the page) of the twisting:
 
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What is the problem? The average deck height looks fine.
 
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I can't imagine it is intentional. There is tremendous axial force in the deck/superstructure from the horizontal component of the stay forces. Not having that force in a linear plane would cause immense localized stress at each lower anchorage that was vertically offset from a subsequent one. I've never seen a geometry like that on a stay cable bridge. The deck/superstructure looks "flimsy" (that is an engineering term) for the compressive load, especially from the distant view.

IC
 
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Is it just me or does the horizontal tie below the deck (tying the bottom of the A frame together) look way undersized?
 
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@RandomTaskkk:

I was just about to post the same comment.

The previous Colombian cable-stayed bridge had a concrete diaphragm, but examination of the debris photos (very little rebar projecting from the junction of the diaphragm and the columns) suggests there was inadequate horizontal tie capacity under the deck. This one has a tie beam, but it just doesn't look big enough when you compare it with the size of the main A-Frame columns.

I'm not sure that the tie-beam capacity is related to the deck undulations - but I'd suggest a thorough design review before they put this bridge into service.

 
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@VE1BLL:

The Millau Viaduct was launched as a continuous multi-span box girder across the towers, which is the stage that the photo shows. For the launching of the deck, temporary steel towers halved the distance that the deck girder had to span until the cable stays were installed. The deviation that you can see in the photo is the sagging of the continuous box girder spanning half of its final span BEFORE the cable stays have been installed. The solitary cable stay pylon that is shown supported the cantilevering deck units as the whole deck was launched from the abutments. The intermediate cable stay pylons were installed after the whole deck had been launched, to straighten the deck alignment and carry the live loads etc.

This animation shows the sequence well:


 
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Wow, that's a mess. The only next step anyone should be considering is demolition. Trying to justify it's continued existence by some load tests just seems like a fools errand. If the construction company cared so little about what could be seen, then what else is hidden that could cause a failure in the near future? I don't see how it could be easily fixed. It appears they managed to build a "flat-ish" deck over that rippled supporting structure.

Seeing these pictures better explains how the last collapse happened.

I thought it was funny that in the deck pictures there appears to be a wheeled construction equipment type box in the low spot of the deck. I wondered if it was put there on purpose or had found it's own resting spot.
 
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some more data and a nice video on the building.


This one says it is to be demolished!


This one has vehicles on it!
Also a lot more in Spanish. If anyone can effectively translate?


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

Photo: RCN Radio.
The National Institute of Roads and the Adaptation Fund reported that the load test of the Hisgaura bridge, which presents some faults in its construction, will not be made until the structural verification report of the work's designs is analyzed.

Although the report on how the mega-project was built was announced by the Technical Studies and Advisory firm (ETA) , the Invías and the Adaptation Fund informed that the loading test will not be authorized with 14 double-deck vehicles, until it is reviewed. In detail, the document and define a timetable for it.

Read here: Protests for failure to deliver the Hisgaura bridge in Santander

"The conclusions of these tables will be taken no later than November 29 and sent to the contractor, who is to present the schedule of the load test" , reported the Adaptation Fund.

Initially it had been known that the date to execute the load test, which would define if the Hisgaura bridge would be put to use, was set for Monday, November 19, however, and after information from the National Government, this process will not be done.

You may be interested: Delays in the delivery of the Hisgaura bridge affect 13 municipalities in Santander

"We have not known an official date when the load test will be done, we have not received a document as to when it could be done, but we are waiting for it because that would define many things regarding the operation of the bridge, which would improve the connection of Santander " , said Julián Pedraza, mayor of the municipality of San Andrés.

Also read: The irregularities found by the Comptroller's Office at the Puente de Hisgaura

On the faults in the construction of the Hisgaura bridge, the Comptroller General's Office warned that in addition to the undulation in its structure , the lighting of the bridge was not included in the contract, when usually there is an intense fog after four in the afternoon.
 
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