The Big Dig Ceiling Collapse: An Epoxy that took down a Tunnel Ceiling
HTML-код
- Опубликовано: 31 июл 2024
- On the 10 of July 2006 the ceiling of the big dig tunnel collapses. This was 9 years after the fort point channel opened to traffic. So what was the cause of this collapse of the ceiling of the tunnel on the I90 in Boston?
I will cover the history around the constitution of the big dig tunnel and what the NTSB uncovered in their investigation into this tragedy. You will find out the causes behind why the ceiling of the fort point tunnel collapsed, what decision led up to the tragedy, and was there warning signs prior to the collapse of the ceiling on the big dig tunnel.
It is important that all engineering understand both the structural mechanics behind the failure, but also understand the decision the led up to the tragedy and how human physiology can play a role in an engineering disaster.
The true cause of the big dig ceiling collapse in epoxy with the same name that had two versions, a fast set and a standard set. These epoxies produced by Power Fasteners had performed similar in a short term loading situation but had drastically different properties under a sustained load. One of these epoxies suffers from an issue known as Epoxy Creep, which means over time under a sustained load the epoxy will stretch and weaken to an eventual point of failure.
What to watch next
How did a Maimi building collapse • How did a Miami buildi...
Engineering Reality Vs Expectation • Engineering Expectatio...
Day in the Life of A structural engineer • A day in the life of a...
Citicorp Center a near-miss • How The Citicorp Cente...
Hyatt Regency walkway collapse • The Hyatt Regency walk...
💡
My name is Brendan and I am a structural engineer with over 15 years of experience based in Australia. I have a wide variety of projects from very small to some of the biggest in the southern hemisphere. I have a passion for good structural design and teaching/mentoring.
This channel is to share my passion for engineering and provide entertaining short clips on:
- tips for young engineers on progressing their careers
- anyone needing a refresher on any design element
- design approaches
- Review past engineering failures to improve structural knowledge
💡
📧LinkedIn Profile: / brendan-hasty-48a40a3b
👍Support the channel on Patreon: / brendanhasty
or Donate Directly via Paypal paypal.me/BHEngineering
🔴
Disclaimer: Some of the below links are affiliate links as an Amazon Associate and other affiliate programs I'll earn a small commission from qualifying purchases at no additional cost to you.
🔴
📚Recommended Books for engineering Communication
Try Audible Premium Plus for free amzn.to/36B4pm0 up to 2 free books
kit.co/Brendan_hasty/recommen...
Concrete Structures Warner geni.us/ConStruct
Steel Designers' Handbook geni.us/SteelHand
Soft is the new Hard geni.us/SoftHard Also on Audible
How to Win Friends & Influence People geni.us/WinFriend Also on Audible
Never Split the Difference: geni.us/SplitDiff Also on Audible
The Subtle Art of Not Giving a geni.us/SubtleArtNF Also on Audible
Books on Structures For anyone who wonder about the engineering behind building design
bringing back the fun to engineering.
Why Buildings Fall Down: How Structures Fail geni.us/WBFD
Structures: Or Why Things Don't Fall Down geni.us/WBDFD
🎥home office
kit.co/Brendan_hasty/engineer...
MX Master 3 geni.us/MXmo
Logitech K580 White geni.us/LogiK580
Samsung 32 Curved geni.us/rAIO
Philips 32 4k geni.us/32Phillips
Zbook Dock geni.us/ZDock
Zbook geni.us/Zbook
🎥Gear and Video Editing
kit.co/Brendan_hasty/youtube-...
Rode VideoMic Pro+ Microphone geni.us/RVMP
Neewer 660 LED Video Light geni.us/N660
Neewer 480 RGB Led Light geni.us/N480
Sony A7 SIII geni.us/2X1kwK
camera Samsung S20 geni.us/SS20
🎥Video Editing
AMD Ryzen 9 3900X geni.us/HVrKeZz
MSI Meg X570 geni.us/kwY70ua
RTX 2080 Super Gaming windforce geni.us/O1AC
Samsung 970 PRO 1TB geni.us/SPR70
Fractal Design Define 7 geni.us/FD7B
🎥SEO tool
Tubebuddy www.tubebuddy.com/BHEngineering
Chapter
00:00 Intro
00:50 Main Structural Elements in a Tunnel
01:43 Type of Post fixed anchors
03:24 Structural issues during construction
05:39 The Investigation
07:05 The Remaining Ceiling
07:27 Was installation at fault
08:27 What is Epoxy Creep
10:17 What did Power Fasteners Know
11:10 NTSB's Conclusions
11:27 Additional findings
If you found this video interesting, you may also like learning about the Hyatt walkway collapse ruclips.net/video/Oqvor82qwzY/видео.html
Amazing Brenden, this case alone shows us the importance and impact of decision making.
Thanks Deepak, decisions can be critical to engineering design. And as engineers we really need to work on our critical thinking, with a scientific approach. Thanks for watching.
im not sure how hammering a dynabolt into a hole is harder than putting 2 part epoxy, then screwing a rod in, then waiting for it to set before applying load and the rest of the drawbacks from epoxy, how is it cheaper and easier to install? either way your drilling a hole thats the hard bit done, hammer a dynabolt in VS mixing, then applying epoxy, dealing with the mess it makes, and the environmental impact.. i could go on, it blows my mind lol. Also when you said "the national beuro of transport safety, or the NTSB" i cracked up. thanks for another great informative film
Hi Chris, Thanks for watching and your support. I didn't realise I miss spoke that is hilarious tho. Also cheers on being the first to point it out. Agree not sure how much harder to install either, the overhead installation is the hardest part and that doesn't change for either option.
Thanks Brendan for your content...always exciting...am not following any series now other than this page
Hi Martin, thanks for watching. Hope I have enough content to keep you hooked.
I like you videos about structural failures. What I find helpfull is to analyse the safety of a design by means of the four safety principals: robustness, redundancy, progressive collapse and plasticity. They can be applied to a new design or to analyse the issues with failed designs (collapses). Robustness: the ability of a structure to resists a totally unexpected situation. Redundancy: the ability of a structure to carry loads by an alternative load path. Progressive collapse: occurs when a structure is damaged to a large extent as a result of an initial (small) local failure. Plasticity: the ability of a structure to anticipate to a sitution, for instance by adapting another structural scheme. At uni, we got the assignment to choose a collapse and apply these principals to find out what went good/wrong. Very interesting.
Hi Henri, thanks for your support. That is an excellent way to approach the review of a structure and thought process in the view. I may use your approach in a future video to help others if you don't mind. Thanks for sharing your thoughts.
Amazing video Brendan, keep up the good work!
Hi Brooks thank for watching. Hope to keep impressing.
Thanks for the video, informative and easily digestible.
Hi Sambo, glad that you found the video informative. Thanks for your support.
This was a good video, can you make more videos similar to this? Structural disasters. I’d love that series!
Hi Karim, Thanks is the plan to do them correctly they take time to script. hope to impress with future videos in this serries.
Great work as usual!
Hi Tonio, thanks for watching. Your continued support is greatly appreciated.
You deserve so much more subs and views!!!! Keep up the good work!
Hi Aldoser, thanks for watching. They will come with time, hopefully sooner rather then later. Just need to workout how to be discovered more.
@@BrendanHasty your welcome! I reallyy hope everyone finds u soon !!
Thanks Brendon. Such a minor detail.
It was and something the little details are critical so you shouldnt overlook them.
these videos are great !
Hi Metamorposis, glad that you enjoyed the video.
Truly enjoy your knowledge. Thanks and pass this on to like minded people. Peace.
Hi Drac Ula, your comments made my day. Thank you soo much for your support and sharing my videos.
These are deep knowledge issues that require critical thinking of someone very well informed to find value in them. You have given engineers and the world at large more than you know. In my experience (am from a 3rd world country so this might be different for most people) structural failures are normally a result of economical aspects of the project. Usually the contractor wants to save more money by going the cheaper way or the client wants to pay for the cheaper options in disregard of the structural engineering implications. From this i suspect a collusion between the epoxy company and the contractor though the epoxy supplier has more to explain.
Hi Mukasa, thanks for you support agree care need to be taken when cheaper solutions are proposed not all alteratives are the same.
The tragedy you refer to is a person! Maria Devale of Jamaca Plain died as she and her husband were headed to Logan. MARIA should be remembered. I'd like to see a plaque. I think of and often speak her name when I pass that spot. I'm an Uber driver so that happens several times per day.
Think she was an illegal
Piss poor design. Bolts could be thicker with wider and deeper threads and/or could be installed at 45 degree angles so the bolts can't just slide straight down.
What type of anchor did they use in the repair?
Hi FreeOnGoal. It was likely a undercut mechanical anchor.
@@BrendanHasty thanks for the response, great video as always!
if they cast the anchors into the top of the tunnel they wouldn't have been a way for them to fail
I remember when this happened, I had just got my license and drove through that tunnel frequently
Must have been concerning driving through the tunnel after.
If those panels weren't doing anything other than creating a false ceiling why make them out of heavy concrete ?!?!
The original design was for light gauge metal sheets to be the ceiling, the need for a concrete ceiling to protect the roof of the tunnel from the heat of a fuel Tanker fire ( terrorism) was realized after the tunnel sections were already built.
@@digger105337 Ahhh! That makes it more clear 👍🏾
Hi!
Hi Amos thanks for watching
Your audio sounds incredibly distorted
Unfortunately, you don't have all the information. I worked with the guy who was the crew boss who installed the bolts. The contractor found it was too expensive to use the correct drill bits, which left a swirl groove in the hole. They also used a third epoxy product that was not mentioned, a version of the epoxy that was way cheaper, but was designed for down anchors, not overhead. The true cause was covered up and Powers fastener took the blame. All their products were than banned for use in all Ma highway projects for a couple of years. The true culprit went un punished because of political connections. The guy( the installer) testified in court these facts and his reports about concerns of using the wrong drills and the wrong epoxy product were sealed and buried in the records. NTSB is a political creature like most government agencies.
Good old creep, the reason not to accelerate the set times
find the music is really distracting
Thanks for the suggestion to improve.
Tofu dreg happens not only in china !
sorry - - I tried to watch this, but could not - - I was driving commercially in Boston that day and was affected by this - - - could not watch - - - too much YOUR FACE