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Started By
Message
re: Pedestrian Bridge Collapses at FIU
Posted on 3/15/18 at 4:06 pm to NYNolaguy1
Posted on 3/15/18 at 4:06 pm to NYNolaguy1
quote:
Also, it looks like there was supposed to be a pier in the middle of the span?
According to the artist rendering It doesn't show a support in the road.
3
Posted on 3/15/18 at 4:06 pm to NYNolaguy1
As many of you have mentioned, the cause is one or more of the following:
faulty design
faulty materials (concrete, etc.)
faulty construction equipment (cranes, cables, etc.)
incorrect construction/installation methods
correct procedures but were not followed
Bad materials or bad construction equipment seem to be the most likely cause for a project of this magnitude to fail, but anything or everything is possible.
faulty design
faulty materials (concrete, etc.)
faulty construction equipment (cranes, cables, etc.)
incorrect construction/installation methods
correct procedures but were not followed
Bad materials or bad construction equipment seem to be the most likely cause for a project of this magnitude to fail, but anything or everything is possible.
Posted on 3/15/18 at 4:07 pm to BourreTheDog
quote:
Figg & Mueller have been designing post tension span bridges since the 70’s.
I'd be most interested in the pre-stressing and casting procedure of the main span.
Posted on 3/15/18 at 4:07 pm to baldona
quote:
Structural company of some sort
Struc'tur'al is the name of the company.
I'm actually working with the company on a project right now
Posted on 3/15/18 at 4:09 pm to CHEDBALLZ
Hard to tell from that one photo. With that much boom and the jib extension it is probably less than 5 tons.
That is more than likely a single part line with small wire rope. Probably 5/8 or 3/4. Highly unlikely it is high performance rope on a picker that small. Probably a 6x19 class
That is more than likely a single part line with small wire rope. Probably 5/8 or 3/4. Highly unlikely it is high performance rope on a picker that small. Probably a 6x19 class
Posted on 3/15/18 at 4:10 pm to NorthEndZone
quote:
As many of you have mentioned, the cause is one or more of the following:
faulty design
faulty materials (concrete, etc.)
faulty construction equipment (cranes, cables, etc.)
incorrect construction/installation methods
correct procedures but were not followed
Bad materials or bad construction equipment seem to be the most likely cause for a project of this magnitude to fail, but anything or everything is possible.
bullshite. The cause was gravity.
Posted on 3/15/18 at 4:10 pm to CarRamrod
quote:
thats not a suspension bridge. it looks like a center truss with post tensioned flanges. I dont like the center truss.... that could be very susceptible to torsion.
Lol at the down votes. That is still not a suspension bridge.
This was my initial thought process. The bridge, as it sat there was basically one big I-beam, over a rather large span. I'm assuming Lateral Torsional buckling occurred when it went unsupported.
Posted on 3/15/18 at 4:10 pm to civiltiger07
quote:
Struc'tur'al is the name of the company.
i assume y'all are talking about this truck.
if so, then hopefully it was just parked there on the jobsite and nobody was actually in it at the time.
Posted on 3/15/18 at 4:11 pm to CHEDBALLZ
quote:
According to the artist rendering It doesn't show a support in the road.
Youre right. The pier was supposed to be on the grass next to the waterway. Still looks like someone missed some temporary supports too.
Posted on 3/15/18 at 4:12 pm to CHEDBALLZ
quote:
Has anyone said what the bolts sticking out the top of it were for?
Hookups for it to become a cable stayed bridge once fully erected.
Posted on 3/15/18 at 4:12 pm to TigerFred
quote:
5 tons
That's a shite ton of weight dropping on something that is not supposed to have any weight on it, especially something that is not supposed to have an impact like that.
The one photo it almost looks to me like that large piece of concrete was dropped onto the top of the bridge because it looks like there is an impact crater on the left hand side of it. But that's just a guess.
Posted on 3/15/18 at 4:13 pm to LSUengineer12
quote:
I'm assuming Lateral Torsional buckling occurred when it went unsupported.
No lateral deflection and the span didnt torsion at all from what I am seeing. I would guess it failed in bending, but I dont know why, probably something to do with the precast tensioning or concrete
Posted on 3/15/18 at 4:14 pm to TheBlueShed
quote:
bullshite. The cause was gravity.
Spoken like a true engineer.
I'm one too, but I can only blame computer software failures on electrons.
This post was edited on 3/15/18 at 4:17 pm
Posted on 3/15/18 at 4:16 pm to CHEDBALLZ
quote:
According to the artist rendering It doesn't show a suppo
Only one span of the bridge had been erected. The "support" that is shown on the right of most of the photos is the lower part of the support you see in the rendering.
Posted on 3/15/18 at 4:17 pm to LSUengineer12
quote:
This was my initial thought process. The bridge, as it sat there was basically one big I-beam, over a rather large span. I'm assuming Lateral Torsional buckling occurred when it went unsupported.
I was designed as a cable stay bridge. Look at the artist rendering. While I agree it was acting like a truss in the center, it clearly was not designed to be completely unsupported for that span...hence the need for the cables. I don't think LTB would be an issue with a base that wide.
I'm with the others who think some temporary supports should have been in place until the cables were attached.
This post was edited on 3/15/18 at 4:20 pm
Posted on 3/15/18 at 4:18 pm to baldona
Not so easy to explain the rating but that thing wouldn't have had anything close to that wight at that height. It is possible that something from a lift above fell on it but it is unlikely.
The large piece of concrete appears to be part of the upper section of the truss.
The large piece of concrete appears to be part of the upper section of the truss.
Posted on 3/15/18 at 4:19 pm to NYNolaguy1
quote:
Also, it looks like there was supposed to be a pier in the middle of the span?
Yes. It appears the bridge construction wasn’t complete. The pier and cables look like they haven’t been installed yet. Without them, the bridge’s loads would have been transferred to a different point.
This very well could be an error in construction sequencing in which the loads of one of the phases in construction hadn’t properly been evaluated.
But I’m not a Civil engineer.
Posted on 3/15/18 at 4:20 pm to TDFreak
quote:
But I’m not a Civil engineer.
I am and I agree with you.
Posted on 3/15/18 at 4:23 pm to CHEDBALLZ
quote:
According to the artist rendering It doesn't show a support in the road.
I looked again and you're correct.
This post was edited on 3/15/18 at 4:29 pm
Posted on 3/15/18 at 4:23 pm to CAD703X
Structural has an office here in Prairieville
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