Who Broke The Bridge?

   / Who Broke The Bridge?
  • Thread Starter
#51  
"CBS Memphis affiliate WREG-TV obtained audio of what it described as two frantic calls to 911 after the crack was found.

In the first, a man said, "We just found a super-critical finding that needs traffic shut down in both directions on the I-40 Mississippi River bridge."

When the dispatcher pressed the man further to determine what was going on, the inspector tried desperately to explain how serious the problem was, saying, "We have critical findings in one of the members that has split. We need to get people off the bridge immediately."

Another woman with Michael Baker placed the second call to 911. In it, she can be heard talking to other people on the bridge as she tries to get help.

"We have spoken with Arkansas because they hired us. We just need police cars out here. To get the traffic off the bridge," she said.

"This fracture had the potential of becoming a catastrophic event that was prevented by our staff's diligent effort in managing our bridge inspection program," Tudor said.

"Engineers were also investigating the cause of the crack. Fatigue from having tens of thousands of vehicles pass daily over the bridge could be a contributing factor, Degges said.


"It's fortunate that routine inspection averted a potential disaster, but the state of our crumbling infrastructure is deeply troubling," said U.S. Representative Steve Cohen, a Democrat whose district includes Memphis.""





They don't say and may not even know yet exactly when the crack opened up enough to separate.
 
   / Who Broke The Bridge? #52  
I drove over that bridge more than a few times. It held nicely for me ! :) It has been a while though.
 
   / Who Broke The Bridge? #53  
There are photos floating about purporting to be from 2019 showing that fracture. I'm not sure I believe it.
 
   / Who Broke The Bridge? #54  
The articles are blaming the center of the M as a flex point. Will be interesting to see if that is really the cause.
If so, quite a few bridges will need to be more thoroughly checked.
I took statics and dynamics in college, why I originally became and electrical engineer, not mechanical o_O
Unequal stretching of the suspension cables due to their varied lengths is one potential cause. Kinda makes sense to this old farmer. Gonna be a lot of bridges looked at pretty carefully.
 
   / Who Broke The Bridge? #55  
Also surprised it didn't break at that last row of bolts next to it. Looks more like a geological stress event than a duty-cycle fracture to me. (Not an engineer, but I play one on TV.)
 
   / Who Broke The Bridge? #56  
Ooops! I knew I gained a bit of weight, but that's ridiculous!
 
   / Who Broke The Bridge? #57  
I’m a retired land surveyor but my degree is in civil engineering and I had structural design classes. I am by no means a structural engineer. I’m pretty sure they will say it’s a fatigue failure. It’s also a bolted connection and they put plates there to make up for the fact they drilled holes in the beam, the plate makes it stronger.

If you have ever walked on a bridge they bounce quit a bit when trucks go across.

There going to go around inspected a bunch of bridges now? I doubt it unless they are of a similar design. They already inspect bridges now, even little ones, they how they catch problems.

After things like this happen there is a sudden screaming for more money on infrastructure. Will things change? I doubt it.
 
   / Who Broke The Bridge? #58  
Me stupid also.
But now, are those self tapping?
or is there an access backside to attach nuts not that it matters much as the break is well past those plates.
The box beam is hollow with access holes
 

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