Miami Bridge Collapse

[BPTactical]

ABC - Accelerated Bridge Construction, Build the bridge next to the highway and then install in 48-72 hours.
Saves up to years of road diversion, etc.

"All progress requires change, but not all change is progress" (Dean Bennett)

"ABC"

Anticipated
Bridge
Collapse

[hollohas]

It is amazing that they would allow people or traffic on or below it before it was completely inspected and approved. If the engineer ordered it be tightened, it wasn't ready yet.

[DenverGP]

The tensioning cables were likely in the top chord. But you'd expect to see them extend out from the ends of the top and anchor somewhere. I haven't seen any pictures that show that.

Tension cables are in the bottom (top is under compression). Saw at least one pic where you can see the tension cable ends. I'll post when I can find it.

[DenverGP]

[hollohas]

Tension cables are in the bottom (top is under compression). Saw at least one pic where you can see the tension cable ends. I'll post when I can find it.

I get that the top is under compression forces. However, tennsioning can be done in the top and bottom. The term is not very clear when you consider pre and post stressed concrete. I see your picture above shows what are likely the round sleeves that contain some sort of post-tensioned tendons.

The top also has them.

What's clear from ALL the pictures, is this bridge was not even close to being done. It's pretty obvious that the anchorage was likely incomplete. The road should have been closed.

[ray1970]

I think we can all agree that physics aside the bridge obviously wasn’t built correctly.

Sometimes there’s a huge discrepancy between what engineering wanted, what purchasing actually ordered, and what the guys in the field actually assembled.

[Rumline]

When my dad graduated from the University of British Columbia School of Engineering (in the 60's) the graduates were given a simple ring made out of the steel from the collapsed Second Narrows Bridge. The bridge collapsed during final construction in 1958, killing 18, because engineers miscalculated the strength of a temporary support. So the grads were given the rings to remind them that if they **** up, people are going to die. My dad wore that ring until he retired.

Clearly some more rings need to be given out.

[BPTactical]

Looking at GP's pics it is clear tensioning cables were present in both upper and lower beams.

[MrPrena]

I am not an engineer, but some engineers said civil engineers should have asked REAL engineers to inspect numbers.

[Grant H.]

The people responsible have a history of sketchy work...

And yet, they're still in business and getting hired for projects...

http://www.foxnews.com/us/2018/03/16...-lawsuits.html