Francis Scott Key Bridge collapsed after ship hit it

In reply to alfadriver :

So I'm seeing that the loss of power that took out the Key bridge and "scared" the Varazzano Narrows bridge is pretty common.  Or at least not as rare as one would think.  They way the Chief described the systems, there are some required back ups to prevent power outages. 

And these redundancies are required.  Curious that they have a pretty glaring single point failure source that still causes issues (assumedly)

Just heard (on NPR *wink*) the City of Baltimore is planning legal action against the shipping company, the ship's operators, and the ship manufacturer, for losses sustained by the people of Baltimore due to the bridge strike and collapse.  

volvoclearinghouse said:

Just heard (on NPR *wink*) the City of Baltimore is planning legal action against the shipping company, the ship's operators, and the ship manufacturer, for losses sustained by the people of Baltimore due to the bridge strike and collapse.  

 

From what I saw they figured out they tried to leave port with known issues, and will claim (rightfully so) that was negligence.

In reply to Steve_Jones :

The size of everything involved is mind boggling. 

Wally (Forum Supporter) said:

In reply to Steve_Jones :

The size of everything involved is mind boggling. 

... she said.

In reply to Wally (Forum Supporter) :

It puts it in perspective when you realize that's a 4 lane highway laying on the boat and it takes up 5.5% of the boat length. 

So a limited access channel will be opened on Thursday- here are some details https://www.youtube.com/watch?v=8IxY31XlFP0&ab_channel=WhatisGoingonWithShipping%3F

Right on schedule.

keybridgeresponse2024.com: UPDATE 21 Multimedia Release: Unified Command to use precision cutting during next phase of bridge removal

Cool Video: Video screen capture.

https://video.wixstatic.com/video/f1b1b7_f935709cca5b491db7149d6a55e5e60f/1080p/mp4/file.mp4

In reply to VolvoHeretic :

Demo charges are by far the safest and fastest way to cut the sections of steel that are under tension. 

I rest my case from the beginning of this thread.

In reply to Toyman! :

Just needed some patience.  

In reply to alfadriver :

I just read they found the 6th and final worker's body so they can proceed faster.

alfadriver said:

In reply to Toyman! :

Just needed some patience.  

Exactly. Looks like it took about a month for the engineers to do the math and modeling to figure out exactly where to place those charges to make the steel fall in the directions they wanted it to. 

In reply to Ian F (Forum Supporter) :

I drafted for 20 years for a Forensic Structural Engineer. We would try to reverse 3D draw and model structures after they collapsed (usually with no blueprints) to figure how they where originally constructed and why they fell down. I can't imagine trying to model a collapsed 3D bridge with over half of it submerged and with only blurry sonic images to go by. Plus having it sitting on a ship.

Am I understanding this correctly? The demolitions team is going to blow the bridge up into smaller sections, and then the recovery team will lift the smaller sections off the riverbed.

VolvoHeretic said:

In reply to Ian F (Forum Supporter) :

I drafted for 20 years for a Forensic Structural Engineer. We would try to reverse 3D draw and model structures after they collapsed (usually with no blueprints) to figure how they where originally constructed and why they fell down. I can't imagine trying to model a collapsed 3D bridge with over half of it submerged and with only blurry sonic images to go by. Plus having it sitting on a ship.

If they found the original drawings it would just be a matter counting the number of truss joints and modeling from there up.  The  Fish Finder on a bass boat could them about the part underwater.

Noddaz said:

Am I understanding this correctly? The demolitions team is going to blow the bridge up into smaller sections, and then the recovery team will lift the smaller sections off the riverbed.

 

 

That's how I hear it. Just took a month to figure out how to do it safely. 

jharry3 said:

VolvoHeretic said:

In reply to Ian F (Forum Supporter) :

I drafted for 20 years for a Forensic Structural Engineer. We would try to reverse 3D draw and model structures after they collapsed (usually with no blueprints) to figure how they where originally constructed and why they fell down. I can't imagine trying to model a collapsed 3D bridge with over half of it submerged and with only blurry sonic images to go by. Plus having it sitting on a ship.

If they found the original drawings it would just be a matter counting the number of truss joints and modeling from there up.  The  Fish Finder on a bass boat could them about the part underwater.

If you're talking about the FSK bridge, I can almost guarantee they have the original drawings. Probably even scanned to .tif or .pdf files. 

Here are a few sonar scans. I would assume they have a lot more than just these 3. This is what they are going to have to model plus what is visible from above the water. They probable have programs that can model directly from the scans.

I wonder where the ship is?

MSN.com ABC News: Striking sonar images show collapsed Baltimore bridge underwater

Well, ship is re-floated and was tugged back to port.  Time elapsed video in the link.  https://www.nbcnews.com/news/us-news/container-ship-set-removed-8-weeks-francis-scott-key-bridge-crash-rcna153005

The delay in using pyrotechnics to break the bridge in smaller pieces was not due to them figuring out how to do it from an engineering standpoint, It was due to the waiting until the last victim had been recovered. 

Remember, always replace your zip ties.

A live 480v reefer cord just flapping around on deck maybe?