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Started By
Message
re: I-40 MEM bridge a bit serious
Posted on 5/13/21 at 8:32 am to BobBoucher
Posted on 5/13/21 at 8:32 am to BobBoucher
quote:
How is it that there’s so much stress on that beam that it cracks it clean through, but then it doesn’t move an inch after breaking?
Redundancy is called for by code, I think. Done plenty of trusses but no bridges but I'm pretty sure about that.
quote:
Vibration and a flawed beam are all I got. The fact that it’s next to a bracket that likely doesn’t flex might mean vibration?
That should be accounted for. The highest stress in that member is just on either side of the connection so I'm thinking it wasn't designed to carry the loads it received.
Eta:
I didn't even notice the footing. That does look like it torqued the structure and caused a torsional shear.
This post was edited on 5/13/21 at 8:40 am
1
Posted on 5/13/21 at 9:48 am to acr3
Weld it up and get on with it.
Posted on 5/13/21 at 10:32 am to acr3
(no message)
This post was edited on 11/15/21 at 2:16 pm
Posted on 5/13/21 at 10:52 am to Bazzatcha
quote:
This repair can be done very easily and quickly by simply adding splice plates on all four sides. Get some plate, mag drills, and bolts patch that mfker and go on with life.
Yikes. I hope you are not in charge of bridge repairs anywhere...........
Posted on 5/13/21 at 10:52 am to ChineseBandit58
quote:
OR it may be a good indicator that some actual structural component has already failed that is not noticeable without more intrusive examination.
this is what I am thinking
Posted on 5/13/21 at 10:59 am to auggie
quote:
There are a whole lot of other suspension rods that are holding the beam in position, so it can't move much. It's fairly serious, but I think they can repair it pretty fast. The part of the structure that really bears the weight is over the top.
It seems to me that the footing under that pillar has sunk slightly and caused a twist. The suspension rods are still doing their job though.
True, for now.
However, additional stress is now shifted to other areas of the bridge that was not meant for the beams and suspension rods. Now you have to have an integrity check of the parts of the bridge that compensated for the flawed beam.
Off the top of my head, I would look at the beam that is parallel to the sheared beam.
Posted on 5/13/21 at 11:04 am to Bazzatcha
quote:
Get some plate, mag drills, and bolts patch that mfker and go on with life.
My first thought as well. Unless there is an additional issue that caused this break.
Also, why is this affecting river traffic?
Posted on 5/13/21 at 11:07 am to acr3
There is some major rust on that. I would think this has been noted before and ignored or not a priority. Wonder what the other issues on the bridge were priority bc I don't think that looks new.
Posted on 5/13/21 at 11:43 am to LSU2NO
quote:
Off the top of my head, I would look at the beam that is parallel to the sheared beam.
I don't think those are actually considered "beams", meaning they aren't load bearing. The load bearing beams are up above those and should be heavy I-beams, that are in shorter segments and bolted together.
I think the broken part is heavy square tubing and is hollow inside, it's more like bracing to help hold things square. As long as they can make sure that pillar is stabilized, I think they can scab and weld that piece back up and be done.
Posted on 5/13/21 at 12:00 pm to BobBoucher
quote:
How is it that there’s so much stress on that beam that it cracks it clean through, but then it doesn’t move an inch after breaking?
Looks like it moved 3-4" inches in this pic
This post was edited on 5/13/21 at 12:01 pm
Posted on 5/13/21 at 12:06 pm to weadjust
If it's moving around easily, I think that's really a good thing. I bet it was cool this morning, out in the breeze over the river.
Posted on 5/13/21 at 12:26 pm to Big Scrub TX
quote:
Why didn't Trump get an infrastructure bill through? He sure as hell campaigned on it.
Perhaps, the 4 years of daily ridiculous impeachment investigations might not have been what this country needed?
Posted on 5/13/21 at 12:28 pm to weadjust
quote:
Looks like it moved 3-4" inches in this pic
Agreed. Having a baw on the beam for scale certainly helps.
Posted on 5/13/21 at 12:32 pm to Big Scrub TX
quote:Constant impeachment distraction. The HofR had one focus. It wasn't on their job.
Why didn't Trump get an infrastructure bill through?
Posted on 5/13/21 at 12:34 pm to junkfunky
quote:It's a weird place for a break.
The highest stress in that member is just on either side of the connection so I'm thinking it wasn't designed to carry the loads it received.
Posted on 5/13/21 at 12:49 pm to Tarps99
quote:Waiting for the push to pass the Infrastructure Bill that contains 33% of its money for actual infrastructure.
Some TN DOT bridge inspectors have a lot of explaining to do
Posted on 5/13/21 at 12:58 pm to CamdenTiger
quote:
Flex seal, and forget it
What happened to duct tape?
This post was edited on 5/13/21 at 12:58 pm
Posted on 5/13/21 at 1:00 pm to Taxing Authority
quote:
The highest stress in that member is just on either side of the connection so I'm thinking it wasn't designed to carry the loads it received.
It's a weird place for a break.
I think if it was caused by overload and heavy stress, it would have been displaced more after the break.
The odd placement, next to a ridged bracket, makes me think it’s vibration/resonance related.
This post was edited on 5/13/21 at 1:01 pm
Posted on 5/13/21 at 1:02 pm to acr3
Send Bubba over there with his Lincoln 220 and some vice grips... have her good-as-new in a couple hours.
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