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.
I was 6 when this happened and my father always brought us to New Hampshire to go camping every summer. I clearly remember not long after this accident, entering the tunnel on our way up to Nh and all of us being pretty uneasy. And the big cheers when we finally got through to the other side.
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.
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.
👍. I was union laborer for concrete flatwork+ foundation sub contractor, I had to squirt that😮 epoxy a few times, that is some nasty 😳 fumes!! Common a nut and bolt 🔩 is so more environmental. Epoxy is a toxic brew uncured
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.
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.
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.
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.
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.
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
If you found this video interesting, you may also like learning about the Hyatt walkway collapse ua-cam.com/video/Oqvor82qwzY/v-deo.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.
I was 6 when this happened and my father always brought us to New Hampshire to go camping every summer. I clearly remember not long after this accident, entering the tunnel on our way up to Nh and all of us being pretty uneasy. And the big cheers when we finally got through to the other side.
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.
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 for the video, informative and easily digestible.
Hi Sambo, glad that you found the video informative. Thanks for your support.
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.
👍. I was union laborer for concrete flatwork+ foundation sub contractor, I had to squirt that😮 epoxy a few times, that is some nasty 😳 fumes!! Common a nut and bolt 🔩 is so more environmental. Epoxy is a toxic brew uncured
Amazing video Brendan, keep up the good work!
Hi Brooks thank for watching. Hope to keep impressing.
Thanks Brendon. Such a minor detail.
It was and something the little details are critical so you shouldnt overlook them.
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.
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.
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.
Great work as usual!
Hi Tonio, thanks for watching. Your continued support is greatly appreciated.
these videos are great !
Hi Metamorposis, glad that you enjoyed the video.
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
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!
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.
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.
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.
if they cast the anchors into the top of the tunnel they wouldn't have been a way for them to fail
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
Good old creep, the reason not to accelerate the set times
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
find the music is really distracting
Thanks for the suggestion to improve.
Tofu dreg happens not only in china !