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Flyover collapse, Jiangsu, China

Flyover collapse, Jiangsu, China

RE: Flyover collapse, Jiangsu, China

An overloaded lorry and the two that are on it are both empty.

RE: Flyover collapse, Jiangsu, China

Wow. Did you see the blue truck on the right? The driver got out and walked away unscathed. Those other vehicles are just pancaked.

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RE: Flyover collapse, Jiangsu, China

According to one report:

Quote (Caixin Global)

The owner of a nearby dumpling restaurant who witnessed the collapse told Caixin there had been many large vehicles on the bridge at that time. One of them was a truck carrying six huge coils of steel, which the man, surnamed Yu, guessed had caused the bridge to fall towards that side.

According to photos from the scene, what Yu saw were hot-rolled steel coils. One of the coils had a certificate affixed to it, stating that it was manufactured by Rizhao Iron and Steel Holding Co. Ltd. and weighed 2,853 kilograms (6,290 pounds). If all six coils weighed that much the truck would have come in at 171 tons, which is considered overweight.

A bridge expert who was on the scene as part of rescue efforts said that the collapse should not have been caused by a single overloaded vehicle. The overloaded truck found at the scene had a load of about 170 tons, but the bridge should be able to withstand at least 4,500 tons of pressure, he said.

The bridge in Wuxi was a single-column pier, a common style of urban bridge where one column supports the superstructure. The expert said the bridge fractured between two piers, but further analysis was needed to determine whether the truck caused the fracture, or if it had been there prior to the incident.

Bridge and road collapses are not uncommon in China, and do often occur due to overloaded trucks. Bridge experts have previously told Caixin that many of the Chinese bridges that have collapsed in the past have actually been up to construction and design standards. Overloading of trucks and violation of traffic rules are a widespread problem in China.

RE: Flyover collapse, Jiangsu, China

Decimal point error... 6 x 2.85 tonnes = 17.1 tonnes

There is no way an overloaded truck caused that or that it could possibly carry 171 tonnes.....

compete structural failure of some part of the bridge deck or pier.

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

RE: Flyover collapse, Jiangsu, China

The truck has a tungsten frame and weighs 150 tons empty. The tires are solid steel, painted to look like rubber. /s

Anyone watching serpentza on YouTube will see coverage of the generally shoddy construction widely available in China. Elite apartment buildings where floors sometimes just open several feet across, because the concrete was mixed to flour-dough levels of strength.

RE: Flyover collapse, Jiangsu, China

If the span was routinely operating in a high (overloaded) stress range then fatigue comes to mind. In the video you can see the span deflect and rotate as the trucks pass.

RE: Flyover collapse, Jiangsu, China

The surviving span shows an unusual support, where the flared corbel at the top of the beam doesn't actually do anything structurally, the span sits only on the top of the beam. The second picture shows that the fallen span is essentially intact, as are its supports, confirming from the video that the span essentially tipped off its supports. That doesn't appear to be a proper design. A further image shows that one of the supports has lost its little tip-top, suggesting that was the point of failure, which resulted in the span rolling inward toward the other span as its support post disintegrated





TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: Flyover collapse, Jiangsu, China

Why? Why!!

RE: Flyover collapse, Jiangsu, China

Why delilah...

I think its a little early to be blaming Tom Jones.

RE: Flyover collapse, Jiangsu, China

What's a Tom Jones and is it funny to make a joke about people suddenly crushed to death?

RE: Flyover collapse, Jiangsu, China

Perhaps too many heavy trucks in the left lane exceeded the anticipated unbalanced load over the length of the continuous span. But I mean I only see two trucks.

RE: Flyover collapse, Jiangsu, China

I’m not a bridge designer but I don’t see how torsion on the span is resisted when there’s only a single bearing centered on each column. And with the flared shape of the column you would expect to see a pair of bearings, yet I only see one in the photos.

RE: Flyover collapse, Jiangsu, China

Correct that there is little torsional resistance. As well, it looks like the overpass is on a bit of a curve, which wouldn't help.

RE: Flyover collapse, Jiangsu, China

They have already started removing the evidence rubble.

www.sparweb.ca

RE: Flyover collapse, Jiangsu, China

That pier in above photo actually has two bearing points. Seems like that might have been what they were reliant on to take out the torsion if there was no end built into the abutments.

I wouldn't say its totally unusual to just have a single bearing on a box girder, especially if it's curved you can get some stabity out of it at larger curvyness and there's some means of resisting torsion forces at some of the supports. It looks pretty straight to me though.

RE: Flyover collapse, Jiangsu, China

Perhaps there is typically heavy truck traffic on this route traveling in one of the lanes exclusively. That could have caused excessive fatigue on the single bearing if it’s constantly being loaded eccentrically.

RE: Flyover collapse, Jiangsu, China

Didn't seem to be a plausible design to me. If both lanes are equally loaded at all times, that's great, but if one lane, then the other, gets loaded, the roadway will rock on its support, thereby fatiguing both any metal (not evident in any picture to date) and the concrete.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Flyover collapse, Jiangsu, China

Quote (SparWeb)

They have already started removing the evidence rubble.

I hate to think that this might be the last time anyone hears/learns anything more about it.

RE: Flyover collapse, Jiangsu, China

I was able to find an article on WeChat about the bridge.
I generated a PDF of the translated version. My browser didn't translate it all. I put some mark-ups on the translated parts.

It's a very strange article. From a journalistic perspective, it's a disaster. I'm not referring to the terrible translation I've done with Google. I'm referring to the way it's making a point in a pleading and accusing way. No way to figure out the author's relationship to the story. Also an awful mishmash of unrelated photos and documents, none of which seem to be related to the bridge that collapsed. I wonder if Chinese people are subjected to this drivel regularly. Unable to read Chinese myself I cannot track down the identity or credentials of the author.

From the perspective of a western reader, the tone very defensive. Points fingers in all directions. It's written the way you would expect from a person close to one of the culpable parties.

Anyway, it's at least "one" perspective on what "someone" in China thinks of the bridge disaster.

www.sparweb.ca

RE: Flyover collapse, Jiangsu, China

Pretty much everything like that is the same over there according to mates that work there.

Every event has to have someone to blame, on an individual bias and there must be punishment for every event. Be it financial, physical, humiliation or in this case I suspect death.

There are story's of Captains getting 2000$ fines for bird strikes in china even when no damage occurs. In Europe and USA its 10 mins filling out a stats form and nothing more is said about it.

RE: Flyover collapse, Jiangsu, China

Well that label is interesting. It looks like those rolls of steel really could be 28.5 tonnes each.

I did a quick calc based on volume of a roll and there are about 2 to 2.5 m3 of steel in one of those rolls (depends on the dimensions you use).

no idea how the trailer isn't visibly bowing or the tyres not blowing out, but overloaded truck does now look like a distinct possibility.

Long single point spans are vulnerable to that, but I don't think the designers should be held up for an overload of possibly 3 or 4 times the design load.

The fact that there wasn't much traffic probably led to the issue as there were no balancing forces...

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

RE: Flyover collapse, Jiangsu, China

That "article" sounds very basic... it's practically instructing the reader on the basic process of how engineering designs are handled (do readers really need to be told designs are reviewed, or be told what a "consultant" is/does?). It reads more like a home blogger with no journalistic/writing background than something from a reputable (or even state-owned) paper.

Dan - Owner
http://www.Hi-TecDesigns.com

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