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re: I-40 Bridge at Memphis closed until further notice
Posted on 5/12/21 at 6:50 pm to BourreTheDog
Posted on 5/12/21 at 6:50 pm to BourreTheDog
quote:
Just off the top of my head, the Tappan Zee over the Hudson River (I -287) and the I-95 bridge over the Delaware River have at least double the freight traffic over this one.
Y’all think Semi Traffic is bad on I-40, spend a day between Newark - Baltimore. It’s nuts
Curious if you combined i55 and i40 Memphis bridges how they would compare...Memphis's industry is warehouse and distribution...I40 between Little Rock and Nashville sucks and should be 6 lanes
1
Posted on 5/12/21 at 7:13 pm to hubreb
For comparison sake, the I-65 bridge just west of Louisville KY (aka Sherman Minton) was closed for two years because they found a crack.
LINK
The link includes what they did for repairs to the only non-toll bridge crossing the Ohio River in Louisville.
LINK
quote:
determining the severity of this crack and others found on the bridge, and determine whether the bridge could be saved.[4][5][6]
It was initially feared the bridge would remain closed from several months to up to 3 years, and that the entire span would have to be either completely replaced or extensively renovated before the Sherman Minton Bridge could reopen to traffic. However, engineers determined the crack that initiated the bridge closure dated back to the bridge's original construction in the 1960s, but had not been discovered until the summer of 2011 because another structural component was covering it. On September 23, 2011, Kentucky Governor Steve Beshear and US Secretary of Transportation Ray LaHood announced the 2.5-inch crack has been repaired, but the bridge would remain closed until crews completed an inspection of the remainder of the bridge.[7] Five to seven additional cracks were discovered during the following inspection in welded areas in a load-bearing steel beam. "The fissures were discovered in a type of steel frequently used in the 1950s and 1960s that is now known to be susceptible to cracking. ...". This necessitated the bridge being closed for an extended period of time for repairs. Repairs cost $20 million and ultimately took four months to complete.[8]
In a news release from the Indiana Department of Transportation, dated October 18, 2011, Governor Mitch Daniels announced that Louisville based Hall Contracting of Kentucky had been awarded the repairs contract in the amount of $13.9 million. A time frame of 135 work days was announce with an incentive of $100,000 per day to finish early. Likewise, a penalty of $100,000 would be deducted from the contract payments for each day over. Repair cost were covered by the Federal Highway Administration, who announced on September 30, 2011 that it would contribute 25% of the cost, with the remaining 75% being equally split between Indiana and Kentucky.
The link includes what they did for repairs to the only non-toll bridge crossing the Ohio River in Louisville.
Posted on 5/12/21 at 8:30 pm to real turf fan
As structural engineer who has inspected hundreds of bridges including 3 that go over the Mississippi River, this is crazy. The fact that bridge and all the vehicles did not end up in the river is insane.
Edit: Having only looked at the localized pictures before I commented above, I assumed this was a giant truss bridge. Being a cable-stayed through truss makes this completely different and not as serious (still a big issue) because of the way the bridge loads are distributed and what the fractured member was doing.
Edit: Having only looked at the localized pictures before I commented above, I assumed this was a giant truss bridge. Being a cable-stayed through truss makes this completely different and not as serious (still a big issue) because of the way the bridge loads are distributed and what the fractured member was doing.
This post was edited on 5/13/21 at 8:52 am
Posted on 5/12/21 at 8:47 pm to Lsupimp
Yeah and you guys are getting a loop too.
Posted on 5/12/21 at 9:18 pm to Mr Reality
not sure if its been posted but a few hours old.
Posted on 5/12/21 at 9:18 pm to OBReb6
quote:
it looks like a clean shear from fatigue
That does not look like a clean shear due to fatigue. Fatigue usually results in ductile fractures, if you look at the cross section of a test specimen in ductile fractures, the metal elongates a bit and gets thinner near the point where the initial yield occurs. I don't see any deformation in the piece. The clean break looks to me more like some sore of embrittlement had happened, which resulted in brittle fracture, more like a sudden snap.
I'm not a materials expert by any means, but I did a fair share of failure analysis and that break looks 100% brittle to my slightly educated eyes.
ETA - after seeing a couple other pictures, I'm not as sure as I was before. I do think there was some embrittlement, particularly in the top of it, but the sides do look more ductile in mode.
This post was edited on 5/12/21 at 9:28 pm
Posted on 5/12/21 at 9:26 pm to wheelr
quote:
99% that crack didn't suddenly appear
The lack of rust on it indicates to me that it's fairly recent.
Posted on 5/12/21 at 9:28 pm to weadjust
shite, a pocket full of 7018’s and a come-along I’d have that bitch fixed in a couple hrs.
Posted on 5/12/21 at 9:34 pm to White Bear
This bridge went through an extensive seismic retrofit back in the 2000s. The retrofit could have transferred forces to members that weren’t intentionally designed to handle.
Posted on 5/12/21 at 10:07 pm to pioneerbasketball
What am I looking at?
Posted on 5/12/21 at 10:09 pm to East Coast Band
quote:
If you track the vessels across the United States, closing the waterway at the I40 bridge is a big deal. I hope it is opened soon!
Posted on 5/12/21 at 10:18 pm to OBReb6
quote:
This is bad. That bridge is the most heavily trafficked freight bridge in the country. Now all that traffic will be diverted to the 55 bridge which was either built by the Romans or aliens, no one knows for sure
The I-40 bridge in Memphis sees 38,000 cars per day on average.
By comparison, the I-10 bridge in Baton Rouge has about 108,000 cars per day on average with the same number of lanes.
It doesn't even see as much traffic as the Huey Long bridge in Metarie (43,000) or Memphis's own I-55 bridge (62,000). I doubt I-40 was even in the top 100 most congested bridges in the country. It's not even the most congested bridge in Memphis.
This post was edited on 5/12/21 at 10:40 pm
Posted on 5/12/21 at 10:36 pm to member12
Posted on 5/13/21 at 7:29 am to member12
quote:
The I-40 bridge in Memphis sees 38,000 cars per day on average.
By comparison, the I-10 bridge in Baton Rouge has about 108,000 cars per day on average with the same number of lanes.
It doesn't even see as much traffic as the Huey Long bridge in Metarie (43,000) or Memphis's own I-55 bridge (62,000). I doubt I-40 was even in the top 100 most congested bridges in the country. It's not even the most congested bridge in Memphis.
From article previously posted...I'm sure traffic is higher than 16 years ago
According to that study, the average daily traffic in 2004 across the I-40 bridge was 54,420 vehicles and 49,800 vehicles for the I-55 bridge. That study said traffic had increased 50% over the previous 10-year period.
Posted on 5/13/21 at 8:00 am to Wtodd
quote:
I-10 between Houston and El Paso would like a word with you
I mean once you get past San Antonio, it gets super wide open and traffic gets super light
Posted on 5/13/21 at 8:11 am to beebefootballfan
To all the Memphis baws, can we get a traffic report this morning?
Posted on 5/13/21 at 8:17 am to Splackavellie
From what I've heard and seen on traffic maps, the biggest issues have been in Arkansas for east bound traffic...took my neighbor 3 hours yesterday to cross
Posted on 5/13/21 at 8:25 am to hubreb
I posted this on the poli board thread but I thought I would leave this here as well....
People are dumb. This bridge deck is not being supported by that longitudinal outer member, its held up from the cables that are connected to both the top arch truss structure at the top and a beams that run perpendicular at the bottom under the roadway, just like sitting on a swing. Now imagine trying to walk across a series of swings without the seats being connected together. The swings wouldn't collapse, they would just want to swing. Well this series of swings actually has multiple connections that prevent them from swinging, including the actual bridge deck itself. This one broken member just puts a little more load in the other members but in no way puts this bridge in jeopardy of collapsing. Traffic has been traveling over it with this issue for at least several weeks to months without any problems and all the sudden some bridge inspectors see this broken member and it's all the sudden unpassable? GTFO.
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.
People are dumb. This bridge deck is not being supported by that longitudinal outer member, its held up from the cables that are connected to both the top arch truss structure at the top and a beams that run perpendicular at the bottom under the roadway, just like sitting on a swing. Now imagine trying to walk across a series of swings without the seats being connected together. The swings wouldn't collapse, they would just want to swing. Well this series of swings actually has multiple connections that prevent them from swinging, including the actual bridge deck itself. This one broken member just puts a little more load in the other members but in no way puts this bridge in jeopardy of collapsing. Traffic has been traveling over it with this issue for at least several weeks to months without any problems and all the sudden some bridge inspectors see this broken member and it's all the sudden unpassable? GTFO.
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.
Posted on 5/13/21 at 8:32 am to Bazzatcha
quote:
Bazzatcha
Did you happen to stay at a Holiday Inn Express last night?
Posted on 5/13/21 at 8:35 am to Splackavellie
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