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Started By
Message
re: Pedestrian Bridge Collapses at FIU
Posted on 3/15/18 at 3:41 pm to Boudreaux35
Posted on 3/15/18 at 3:41 pm to Boudreaux35
quote:
Check this photo though. There is definitely a crane on the other side of the structure.
doesn't change anything. one of the biggest no-nos in construction is you don't put anything under and hanging crane load. I seriously doubt that they had a crane lifting on something over the road while cars are driving on the road. Secondly the crane looks to be in perfect shape.
1
Posted on 3/15/18 at 3:43 pm to NYNolaguy1
those test cylinders just became VERY valuable
Posted on 3/15/18 at 3:47 pm to SeeeeK
quote:
YIKES!!!!!!!!!! 6 Hours
quote:
A now-unavailable (but cached) page on FIU News says the bridge was constructed "using a method called Accelerated Bridge Construction" & installed on Saturday in 6 hrs to minimize traffic disruption
Ambulance chasers will be out in plenty.
It wasn't built in 6 hours it was moved into place in 6 hours. We moved a 2,900 ton module that was 150' tall about 400 yards onto a barge with those transporters. You right on the ambulance chasers though.
Has anyone said what the bolts sticking out the top of it were for?
Posted on 3/15/18 at 3:48 pm to civiltiger07
quote:
those test cylinders just became VERY valuable
The whole chain of contract documents is going to save someone and bury someone else...
Who ever took the 7 and 28 day cylinders, the company that tested it, the engineer that signed off on it, the engineer of record that approved the test results, not to mention if there was any sort of load test off site (there should have been, especially if precast).
I'd make a fair bet theres video of the collapse somewhere. A lot of construction companies keep time lapse videos of construction for PR purposes.
Posted on 3/15/18 at 3:49 pm to Jim Rockford
quote:
Before Saturday’s installation, FIU said the method of overall installation significantly reduced the risk to workers, walkers, drivers and minimized traffic disruptions for construction.
Oops
Posted on 3/15/18 at 3:51 pm to NYNolaguy1
quote:
If I had to guess it was sub-par concrete.
I'll put my money on failed anchorage in the post tension system.
Posted on 3/15/18 at 3:52 pm to NYNolaguy1
Eta: looks like a hydraulic strand jack. Why they are jacking strands with traffic underneath is beyond me.
This post was edited on 3/15/18 at 4:00 pm
Posted on 3/15/18 at 3:52 pm to NorthEndZone
Looks to me like the lack of a concrete support in the center caused the collapse. To much weight for that long of a span
Posted on 3/15/18 at 3:53 pm to NYNolaguy1
Strand jack.
How much you want to wager?
How much you want to wager?
Posted on 3/15/18 at 3:54 pm to Mr. Hangover
quote:
IT WASNT A SUSPENSION BRIDGE YALL
RAMROD IS ABOUT TO HAVE A SHITFIT IF YALL DONT RECOGNIZE THAT THIS IS NOT A SUSPENSION BRODGE!!!
And that part of the bridge wasn't even built yet. Looks like it was supposed to be designed to hold itself up during construction to avoid shoring on the street. Has to be either a materials failure or error in design.
Posted on 3/15/18 at 3:54 pm to NYNolaguy1
quote:
Also post tentioning is notorious for sudden failure. Google "precast concrete parking lot failure" and you will get a lot of results where the concrete failed suddenly due to botched casting or weak concrete that someone missed.
I was inspecting a job site when they were tightening the cables in a tennis court. One snapped and and came tearing out of there. Had anyone been standing nearby they would have been killed by the cable.
And for those acting likes it's crazy they moved the bridge in to place so quickly, that's SOP for a lot of places. That concept has been around for decades.
Posted on 3/15/18 at 3:55 pm to TigerFred
quote:
Strand jack.
How much you want to wager?
Exactly what it is.
Posted on 3/15/18 at 3:56 pm to NYNolaguy1
Those bolts by the cooler look to be tie in points for more supports that weren't in place yet. That bridge definitely should have had some temporary support in the middle.
Posted on 3/15/18 at 3:56 pm to TigerFred
quote:
Strand jack.
How much you want to wager?
You win
Why are they jacking strands with people going underneath in a span thats already in place?
Posted on 3/15/18 at 3:57 pm to deltaland
quote:
Looks to me like the lack of a concrete support in the center caused the collapse. To much weight for that long of a span
That why post tensioning is used.
Posted on 3/15/18 at 3:58 pm to CHEDBALLZ
quote:
Those bolts by the cooler look to be tie in points for more supports that weren't in place yet. That bridge definitely should have had some temporary support in the middle.
Whoever did the means and methods might want to hire a good lawyer.
Also, it looks like there was supposed to be a pier in the end of the as built span.
This post was edited on 3/15/18 at 4:37 pm
Posted on 3/15/18 at 3:59 pm to civiltiger07
The capacity of that cherry picker, or crane as some people are calling it, as it it is configured, isn't heavy enough to cause any damage that would cause an immediate failure of the bridge structure.
Posted on 3/15/18 at 4:02 pm to TigerFred
Are there any reports of workers being under or on the bridge? That one truck is a work truck, Structural company of some sort.
Posted on 3/15/18 at 4:03 pm to TigerFred
I'd say 12-14 tons as it stands. That much boom out and the capacity goes down pretty quickly.
Posted on 3/15/18 at 4:04 pm to NorthEndZone
quote:
“This project is an outstanding example of the ABC method,” said chair of FIU’s Civil & Environmental Engineering Department and director of FIU’s ABC-UTC Atorod Azizinamini
Let us hope not
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