Posted on 03/16/2018 3:59:12 AM PDT by csvset
Yes, that was the story, thanks.
You’re good.
.Not the best video, some of the comments are interesting regarding the construction process.
And I DO BLAME THE CONSTRUCTION COMPANY. The bridge fell on their watch. They were doing stress test and, now adjustments, per Little Rubio, yet they did not close the road! They murdered people for their incompetence and they should be accountable.
Cars weren't stopped, they were crushed under the collapse. Death toll now 6 and bodies still underneath today. https://www.msn.com/en-us/news/us/at-least-6-killed-in-florida-bridge-collapse/ar-BBKhNbI?OCID=ansmsnnews11
Aesthetically pleasing. I’m sure they had a committee review several alternatives but this one was selected.
As a former County Engineer I was involved in a project that was much needed and had been under development for several years prior to my employment. The preferred design that had been selected had an estimate of $13 million but every attempt at securing grant funding to construct it, including TIGER grants had come up empty.
Basically I reviewed the other alternatives and chose the 2nd place alternate which only had a price tag of $3.5 million. I did this without a committee and then sold the plan to the Board of County Commissioners with the only drawback that we would have to throw away the previously spent $1 million on engineering. They said go for it and it was completed a a year later.
What was the difference? The expensive design called for the existing bridge to be removed and a new bridge be constructed. The one I selected utilized the existing bridge.
The one thing to take away from all of this is that never use a committee to select the design. They always take the one regardless of the practical factors.
When will we find out the construction company hired “day laborers” (i.e. Illegal immigrants), who did less than adequate work?
JoMa
Wow. I’d never heard of that incident, was probably deployed overseas at the time.
Mexican concrete.
Thanks, but I’m not good. I’m pi$$ed.
The Autoban in Germany has some pretty high bridges.
I dont think I would be able to drive across that thing without a hand full of valium. Especially after seeing their handiwork in Miami. I like big bridges built with Yuge American steel and gigantic rivets and physical supports I can see and have become accustomed to. (Channeling my inner “Bones” on the hazards of “transporter use”.)
This beautiful magic bridge crap just doesnt do it for me.
The bridge in Miami was dinky compared to this structure! And there is the same amount of gravity pulling down on both of them.
Do you think maybe the same engineers from the same company that built both the huge bridge and the tiny one in Miami are the same ones or even consulted with the engineers that built the smaller one THAT COLLAPSED under its own weight?
Update at the link-—
UPDATE, March 16, 2018, 11 a.m.: To clarify, Leonor Flores did not work on the FIU-Sweetwater UniversityCity Bridge project in any capacity.”
.
No, the Miami bridge builders are small potatoes compared to the companies that build those massive expansive bridges.......
I’ve been in construction for over 40 years. I took a good look at the situation and had a pretty good idea right away what happened.
Have you seen the surveillance video of the actual collapse? Here it is: https://www.cnn.com/videos/us/2018/03/16/video-of-florida-bridge-collapse-sot.cnn/video/playlists/florida-bridge-collapse/
One would suppose the structure could have been substantially post-tensioned while yet on the ground once the fabrication process was completed.
OTOH, what are the odds this was a Hyatt walkway type of failure?
I’ve been in construction basically all my life. My son is an engineer. We were watching the news reports together and i noticed the bolts on top of the center truss and said there is a structural element missing and where is the falsework at center span? This was all before seeing the rendering of the bridge or seeing the photos of the span placement over the weekend.
I agree about post-tensioning before the set. They could have cambered the deck in place and pulled tension on the tendons at that time. That said, a falsework support was still needed IMHO. Setting the span and then pulling tension without the center falsework probably contributed to the collapse again IMHO.
The bridge was only supported by the ends placing it in a catenary position (a downward parabolic position), now you pull tension and what happens? You pull the camber the wrong way. They may have been pulling above spec to try and camber the structure the proper way and instead caused the failure.
Just speculation mind you but the whole thing is a cluster and people are in deep doo doo.
No I haven’t, thank you.
I don’t think this was a Hyatt style deal. There was no live load and no dynamic live load. If you recall the Hyatt incident was precipitated by a high live dynamic load ( people at a party filling the spans and dancing).
The mechanism of failure was structure fatigue of the horizontal members at the vertical tie-ins. The vertical support members were to be continuous so each individual span was supported independently, instead the erectors hung the verticals from the flanges of the channel above, meaning the flange on the top span carried the load of all the lower spans and the flange failed. That was a failure induced by the constructors.
IMHO the Miami failure was an engineering failure. The engineering firm must have specified the methodology here and that was lacking safety margins.
The Hyatt changes to the vertical were approved by the engineers when they reviewed the shop drawings. The engineer was eventually found guilty if I remember my ethics courses correctly.
You may be correct, it’s been a long time.
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