DAVENPORT COLLAPSE - FORENSIC INVESTIGATION - Part 2 of 2

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Building Integrity

Building Integrity

11 ай бұрын

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𝙈𝙞𝙡𝙡𝙚𝙣𝙣𝙞𝙪𝙢 𝙏𝙤𝙬𝙚𝙧 𝙥𝙡𝙖𝙮𝙡𝙞𝙨𝙩:
• Millennium Tower
𝘾𝙝𝙖𝙢𝙥𝙡𝙖𝙞𝙣 𝙏𝙤𝙬𝙚𝙧𝙨 𝙎𝙤𝙪𝙩𝙝 𝙥𝙡𝙖𝙮𝙡𝙞𝙨𝙩:
• Champlain Towers South
𝙊𝙣 𝙋𝙤𝙞𝙣𝙩 𝙥𝙡𝙖𝙮𝙡𝙞𝙨𝙩:
• On Point
𝙊𝙣 𝙩𝙝𝙚 𝙅𝙤𝙗 𝙥𝙡𝙖𝙮𝙡𝙞𝙨𝙩:
• On the Job
𝙊𝙣𝙚 𝙤𝙣 𝙊𝙣𝙚 𝙥𝙡𝙖𝙮𝙡𝙞𝙨𝙩:
• One on One
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Disclaimer: Nothing contained within this video should be construed as legal advice. Building Integrity makes no claims of its own regarding the guilt or innocence or liability otherwise of any legal entities mentioned in any of their videos. These videos are made for news/informational and educational purposes only.

Пікірлер: 870
@KathrynsWorldWildfireTracking
@KathrynsWorldWildfireTracking 10 ай бұрын
Sir, you are proof the "these days, people can't pay attention to anything long" is a dirty myth. We are not irritated by length. We are intolerant - of having our time wasted. Know your audience. Tell us what we want to know. And we'll listen - for hours. Because you provide valuable information. No filler. No clickbait. No BS. Just facts. Critical evidence. Clearly communicated. (And that's why we love you.) Thank you!
@andreaberryman5354
@andreaberryman5354 10 ай бұрын
Agreed. WHY neither party put verticle support beams along the inside prior to construction remains a serious mystery...
@Herlongian
@Herlongian 10 ай бұрын
Still always strive for not saying a single irrelevant word. For example, when changing the marker color there is no need to spell out in words that this task is going to be done. I would say in most places in the US, this building would have been red tagged. Ask yourself why wasn’t it. Follow the money.
@johnm9263
@johnm9263 10 ай бұрын
No, the guy is right, but hes being way too cautious, for good reason 1. Gen z wants "time blindness" accommodation (basically work whenever they want, be late whenever they want) 2. People don't listen to the details and listen to keywords only 3. People are too much of snowflakes (im offended over you using the wrong pronouns even though you have no way to know which ones are correct or unoffensive, etc.) 4. And more Trust me, im part of gen z and its awful, they cant keep their attention on something that they wanted (the humor is pretty telling)
@johnm9263
@johnm9263 10 ай бұрын
​@@Herlongianno, because ive learned to "overexplain" things because people inevitably ask stuff because of those (as you feel) "irrelevant" words which would be explained by those "irrelevant" words
@joem1070
@joem1070 10 ай бұрын
It sounds like the engineer that designed the repairs was more than careless. I’m betting the building owners will be going after his errors and omissions insurance. Hard to believe the plans were stamped by a P.E. And that the engineer did regular visits to the site. As a small contractor I worked on 3 brick thick townhouse in Wash DC. And by looking at the window bucks there was no guessing about the thickness of the walls.
@ap70621
@ap70621 11 ай бұрын
Another instance of my thoughts changing from, "How did this building fall?" to "How was this building standing?"
@joerivanlier1180
@joerivanlier1180 11 ай бұрын
To be honest I'm amazed with the original engineering. But no mind is great enough to build something that survives a overconfident idiot.
@ehsnils
@ehsnils 10 ай бұрын
A jenga tower would be more secure and stable
@space_artist_4real138
@space_artist_4real138 10 ай бұрын
Agreed ap70621, I was feeling stressed out all throughout the chronologically ordered photos of the contractors work, I feel like its a miracle it stood while they were doing the modifications. Man that picture at 12:01 is MonkaS, and I feel physically uncomfortable looking at 42:28 in fullscreen, it's being held by these frail sticks, it wants to fall on me lol
@rabidbigdog
@rabidbigdog 10 ай бұрын
and (for me) "people are going to jail..."
@alexlail7481
@alexlail7481 10 ай бұрын
@@ehsnils actually the slow collapse shows that the original structure was built quite well for its era. The fact that the building was violated in the way it was and still remained standing for roughly a month even though it was screaming for help the whole time shows that it was well constructed originally and recent history of poor maintenance, understanding, and possibly indifference contributed to the collapse as much as anything else.
@alexandermckay8594
@alexandermckay8594 11 ай бұрын
Don't apologize for going long. You do it to make sure we get it and it's a brilliant job.
@henryt9281
@henryt9281 10 ай бұрын
my nigga Jesus Christina
@Emily_M81
@Emily_M81 10 ай бұрын
Right? I didn't even notice until I read this, then glanced at the time and went "oh wow" 😅
@SaintBrick
@SaintBrick 10 ай бұрын
100% This is why we are here
@debl9957
@debl9957 10 ай бұрын
Agreed
@randycarter2001
@randycarter2001 10 ай бұрын
I'm not at all unhappy that this video ran long, I LEARNED something new. My take away from this, is they had the wrong people looking at the building. They just didn't understand what it was telling them. Due to either laziness or cost considerations it was to little to late to save it.
@smartysmarty1714
@smartysmarty1714 10 ай бұрын
I've been a carpenter contractor for 46 years, and have worked on many of these old brick buildings, so maybe I have a bit of an advantage when I say definitively that the engineer in charge of this project was a complete and total SCREAMING IDIOT. And his contractor wasn't far behind. I've had to challenge many, many drawings and "game plans" for similar reasons because sometimes what they draw will never work. This catastrophe could have been avoided through simple common sense. They didn't even have to be all that experienced....just smarter than your average bucket of bricks. It's an actual miracle that this thing didn't cave in on the contractors while they were working on it. I'd be willing to bet it was making strange popping sounds all day long...
@rogerwilco2
@rogerwilco2 10 ай бұрын
I fear that like is common in the USA, the individual will be blamed. Everything will be put on the engineer and the contractor. But the real problem is that these people were allowed to do their work with apparently insufficient training, awareness or regulation. The USA is very good at blaming the individual and not fixing the underlying system that put that individual in that position. Laws and regulations should change. Not just in Iowa, but all across the country. Better trained engineers and constructors should be required to prevent this from happening again.
@smartysmarty1714
@smartysmarty1714 10 ай бұрын
@@rogerwilco2 --- While I sympathize with your position and understand what you're implying, there are tens of thousands of engineers and contractors in the US that wouldn't have made these mistakes. In essence, two stupid ones were chosen here, and I can't see how you could have a system in place that teaches away stupidity (and greed). Moreover, an engineer who is confused KNOWS he's confused and should be smart enough to ask for senior advice or walk away from the project, thus making him responsible for his own actions. Blaming "the system" never works. Individuals need to take responsibility for their mistakes.
@1everydaycooldude
@1everydaycooldude 10 ай бұрын
⁠@@smartysmarty1714 the “bucket of bricks” was literally smart that the two boxes of rocks.
@veramae4098
@veramae4098 10 ай бұрын
Lived in an apt building in this same town, 40 yrs ago. We'd had a massive snowstorm, ceiling kept making weird agony sounds. (Top floor). We called manager with worry that it should be inspected. "It'll be fine" she said. Three days later a wooden beam came thru the dining room ceiling! Since my roomie and I had complained first (it was a big complex and others had called about agony sounds after storm) we were moved into model apartment. Everybody else had to move to cheap apartments or cheap hotel rooms. Apt company did pay rent. 'Cause it turned out instead of solid beams the contractor had somehow connected shorter ones. (Don't remember exactly.) ALL the buildings had to have their roofs rebuilt, about 12 big buildings. We talked to a city inspector who was working, and in a very round about way he gave us reason to think he thought the original inspector was an incompetent SOB.
@RobinTheBot
@RobinTheBot 10 ай бұрын
​​@@smartysmarty1714 An idiot was chosen... By who, friend? By what method (or indeed system) was the idiot chosen over the competent worker? I've worked for a company before. I can guess. Idiots are cheap. Putting idiots in charge though is something the corp needs to be personally responsible for. What you're suggesting goes against what you believe, too. If you think it's impossible to make a system that prevents greed and idiots, then you can't believe that the solution is to make sure every single person makes the smart and wholesome choice. You need to make a system which works even with idiots in it, which verifies and works beyond the individual (which is how regulation works). Personal responsibility only works if you believe every single person is in fact responsible and trustworthy. They're not. So you need more than personal honor. If you think there are engineers who are not responsible and who are not honest, no amount of personal responsibility and honesty will work! You need to look at your society and think hard about how to ACTUALLY do things right. And that almost always means starting with reforming the system. If you believe you can't train out dumb then you also believe in reforming the system. You've just been taught otherwise, somehow.
@bimmaru9542
@bimmaru9542 10 ай бұрын
The ability for brick masonry to shift load paths so far like that is impressive. And it gave so much warning before throwing in the trowel.
@timothystevenhoward
@timothystevenhoward 10 ай бұрын
its amazing it held together so long. also sad that they bulldozed the entire structure, since the other half of the building is not supported this way and was needlessly razed. seems like an emotional decision, not based on any rational analysis.
@1556cm
@1556cm 10 ай бұрын
​@timothystevenhoward trust me, they will be able to spend less for something new that can make them more money than upgrading the original. Probably get twice as many floors at triple the rent. Given the changes in building codes, materials and techniques, they are probably secretly thrilled to have a fresh start.
@othername1000
@othername1000 10 ай бұрын
Trowel
@Frommerman
@Frommerman 10 ай бұрын
@@timothystevenhoward This was an evidence tampering decision. It's pretty clear the owners of this building knew the structure was dangerous and were choosing not to spend money to fix it, evacuate the people they were endangering, or take any actions to uphold their responsibilities as landowners. They are criminals, and should be in prison or hanging from lamp posts. Demolishing instantly prevents any further evidence of their malfeasance from being uncovered.
@michaelhubbard5013
@michaelhubbard5013 11 ай бұрын
Literally the best engineering channel. Always excited for a fresh Building Integrity video.
@BuildingIntegrity
@BuildingIntegrity 11 ай бұрын
Thanks!
@uploadJ
@uploadJ 11 ай бұрын
I will never look at an old multistory brick building the same in the future. There is so much subtlety to recognizing the structural issues associated with an old structure, it takes very careful consideration in the care and eventual remediation (if that is the course chosen) to make these structures safe and useful going forward.
@carlwilliams6977
@carlwilliams6977 11 ай бұрын
You missuse the word "literally", and so does Josh (regularly!).
@ccq6877
@ccq6877 11 ай бұрын
Agree. Not being a structural engineer, I’ve learned a thing or two by watching these videos. I can see that one would have to understand (a building whisperer if you will🤫) how the whole building integrates in order to make a repair such as this.
@the51
@the51 10 ай бұрын
Yes! I was missing the new content so much I went and watched an old episode last night. Now I feel like it was good luck because he released a new one today. Lol
@ruthsteen6943
@ruthsteen6943 10 ай бұрын
That photograph of the deformed window from the inside is terrifying. I don't understand how that didn't trigger an evacuation, it seems so clear that the structure of the building is in major trouble.
@stevehuffman1495
@stevehuffman1495 10 ай бұрын
Tenants were posting images of building deflection within their units prior to the collapse. Any reasonably competent facility manager would have been screaming for an evacuation.
@Garden366
@Garden366 10 ай бұрын
Yeah, there’s something about a melting window that makes me want to leave the building.
@royalnuts
@royalnuts 10 ай бұрын
It's sad but money rules the world. For contracters, for building owners, governments. Btw did you know your last name means brick in Dutch? How is it possible a steen (brick) is reacting on a failing brickbuilding? Probably a coincidence... but lol ;-)
@syx3s
@syx3s 11 ай бұрын
it really is a testament to how strong that building actually is that it didn't just collapse as soon as they started tearing the structure apart at the base.
@Matticitt
@Matticitt 8 ай бұрын
right? relly impressive.
@absurdengineering
@absurdengineering 10 ай бұрын
Your constraint is amazing. I was internally screaming watching this. I’ve had masonry tradespeople who would know what to do with this without any engineering input. I’ve seen them do such jobs. I know that their lead guy would go paper-white-faced upon seeing this. It’s so infuriatingly crazy what went on with all those “repairs”.
@abbyf7610
@abbyf7610 10 ай бұрын
I toured the building two weeks before it collapsed, and would've been neighbors with one of the souls that died if I didn't get accepted at another apartment complex. We can't thank you enough for going into detail about this investigation. We can't let corruption slide.
@pjaypender1009
@pjaypender1009 3 ай бұрын
Years ago I also toured the building and was very close to moving there until I decided to take a place closer to where I work. Even when I looked at it, it was very lipstick on a pig. The apartment they showed me had new appliances and fresh paint on a clearly declining structure.
@abbyf7610
@abbyf7610 3 ай бұрын
@@pjaypender1009 that's the perfect description for it! There looked like there was zero maintenance in the hallways and elevator too...the worst part was how many kids and families I saw just in touring a few apartments
@jasons8479
@jasons8479 11 ай бұрын
It's a miracle the thing didn't collapse sooner given all the structural brick that had already failed (crumbling, pulverizing, falling, etc) and was no longer bearing loads above, forcing adjacent areas (which may not be in much better condition) to carry both loads, thus contributing to their failure, and repeat. There's only so much support that you can remove over time before gravity does its thing on everything above.
@JainZar1
@JainZar1 10 ай бұрын
A toast to pessimistic engineers and their safety factors.
@jasourwnjl
@jasourwnjl 10 ай бұрын
Just to add insult to injury GEICO has twice refused to honor the rental insurance of one of the tenants. The insurance adjuster told her she should have gone back into the building to get her stuff since her part of the building did not collapse. Story is on our local subreddit and a couple of local outlets.
@JH-lz4dh
@JH-lz4dh 10 ай бұрын
WOW 😡
@rayshideler1193
@rayshideler1193 10 ай бұрын
F that, Whoever at Geico said that should have to go in and get her stuff themselves. I wouldn't go anywhere near that building no matter what any engineer said. This should be made more public. You pay month after month and they expect you to go into a building that's partially collapsed. Would they want someone they cared about to go in.
@gantmj
@gantmj 10 ай бұрын
Renter's and homeowner's insurance are scams from day one. This response is to be expected as standard.
@othername1000
@othername1000 10 ай бұрын
Nice
@FranNyan
@FranNyan 10 ай бұрын
*Wow* I hope the local news manages to get it to pick up enough steam to shame that company into compliance. Pretty sure no one would *let* any of the tenants go back in there due to the risk as that's a fairly SOP for these things..
@TR-wm3sg
@TR-wm3sg 11 ай бұрын
Discovered your channel after Surfside. Your videos are amazing. Detailed and scientific, but explained well enough for anyone to understand. Thank you!
@timothydoyle9635
@timothydoyle9635 10 ай бұрын
This. Impressed by that series of videos. Also impressed the quality is always top notch.
@ysgramorssoupspoon
@ysgramorssoupspoon 10 ай бұрын
This!!! All hail Mr. Josh
@joemehere1151
@joemehere1151 10 ай бұрын
Ditto on everybody's "don't apologize for the long video", comments. I don't know of any other engineering channel able to keep me glued to the video screen until the end like this one does. Very educational. You make things make sense! Thanks!
@CaptainCheezmo
@CaptainCheezmo 11 ай бұрын
No wonder the mayor wanted his buddy's apartment demolished right away. The investigation has clearly turned it from negligence to gross negligence, incompetence, and reckless disregard for human life, causing injury, death, and loss of home/possessions.
@jeannet.9125
@jeannet.9125 10 ай бұрын
I live in Davenport. We've been calling all of this out since it happened. Had we not shown up to protest in front of City Hall (across from the collapsed building, ironically) they would have moved ahead with the demolition before the bodies were even recovered. (Mind you, the stuff really hit the fan when it was discovered, to our horror, that there was still a person inside that building, along with numerous pets - which were, finally, rescued.) The bodies remained underneath the rubble for days.
@veramae4098
@veramae4098 10 ай бұрын
@@jeannet.9125 Agreed. Don't reelect any of these people!
@hooperinaali3989
@hooperinaali3989 10 ай бұрын
And tax payers are footing the bill for the expedited cover up opps I mean total legit demolition
@silvin90001
@silvin90001 11 ай бұрын
As a structural engineer I really love the longer format, detailed videos you produce. This was fascinating, I've heard about multiple-wythe brick construction but I've never dealt with it firsthand. Hopefully other engineers/contractors can watch part 1 & 2 to educate themselves about this method of construction and the dangers of modifying it, hopefully avoiding another similar unnecessary disaster.
@uploadJ
@uploadJ 11 ай бұрын
I as an EE appreciate the 'deep dive' taken in the science of brick and steel beam building analysis and repair ... as mentioned above, I will never look at a brick structure the same again.
@samlevine4863
@samlevine4863 10 ай бұрын
yes, I recall the instructor in my structures class talking about it. There was some ancient reference about how thick to make a supporting wall. I never knew anyone who could do it.. I'm pretty sure that modern structures programs don't have this, do they?
@smartysmarty1714
@smartysmarty1714 10 ай бұрын
@@Lanedl1 -- In my 46 year career, I've seen quite a few of these structural brick walls. Most are keyed together to stay solid and back up to the facade, but I have also seen a few where the inside was basically a dumpster full of brick and mortar chunks with no rhyme or reason. A lot of sketchy stuff went on back in the day, and of course when they were new they didn't give up their secrets. After seeing everything I've seen over the years, I wouldn't take one of these old brick money pits if I could have it for free. There is a reason I say "they don't build them like they used to" but it doesn't mean what most people would think it means. The same applies to old farm houses, and just about everything else. Until modern dimensional lumber came on the scene with span and load ratings, it was like the wild west out there.
@veramae4098
@veramae4098 10 ай бұрын
@@smartysmarty1714 My grandfather, who was a master carpenter, used to laugh about "they don't build 'em as well as they used to". He said only the well built ones were still standing, the bad ones had fallen and we just don't see them.
@arthurmoore9488
@arthurmoore9488 10 ай бұрын
@@veramae4098 The technical term is "Survivorship bias". Same reason why the "Roman Concrete is amazing" myth is annoying.
@dougberrett8094
@dougberrett8094 10 ай бұрын
Classic case of seeing what one wants to see, while overlooking things that should be obvious. Reminds me of years ago when I was presented a problem at my place of employment. There was a tool that, on occasion, when being dismantled, would break. This was costly, like about $10,000/time. All the people who had dealt with this for years attributed it to carelessness on behalf of those taking the tool apart. I investigated. The design engineer had made it virtually impossible to put ANY bending moment on the part being removed. That is what it would have taken, IF it was carelessness, as they thought. I could see that something else was in play. I looked at records of when the tool had been run. There were two conditions that both had to be met, before the tool was broken upon disassembly. High heat, and high pressure. One without the other was not sufficient. Clearly there was something else going on. Turns out an insulator material was not up to the task. It would deform when both high heat and pressure were there, but was strong enough when one or the other was not present. The deformation made it impossible to remove the tool without breakage.
@Anne5440_
@Anne5440_ 10 ай бұрын
I'm just an old woman with zero training. But as I watched your explanation I understood because you were special plain language and show what was happening. As I watched I began feeling physically ill because people were allowed to continue living there. By the end I was having to fight off going into hysteria over the lives lost. From the news at the time this was happening I remember a statement that this was low income housing and some homeless were given shelter to live there. Part of me now wonders if the people were allowed to continue living there because "they are poor ". It is clear that our society doesn't think the poor matter. I am old and sick but I'm trying to figure out out how to determine if the same sorts of situations could be developing in my own area. And also where to inquire about these things in my small town. I thank you for sharing your knowledge.
@ericenfield2193
@ericenfield2193 10 ай бұрын
I could be way off base here, but I think people were allowed to continue to live in the building, not (directly) because they were poor, but because the building owner(s) was a money grubbing slumlord. It costs big money to make these repairs... It also brings big attention when you evac a building (think state/city inspectors) and your building, the thing you own/possibly owe money on could be forcibly condemned and your income/equity is gone and we all know that is far more important than human life /sarcasm.... The problem with most situations starts from the top - management or leadership in the workforce/military and so on. Here it was ownership. It probably started when they bought the lame duck building without doing due diligence on the condition of the building. Would you buy a house without a thorough inspection by a competent party? Their lack of concern and understanding is further shown by firing the first contractor who raised concern/alarm and said that it would cost even more and followed through until the end when after the work was completed and the facade was sloughing off. Any prudent person/group would have the building or at a minimum, the units in that area evac'ed. But no, money/income is more important. I hope that the owner(s) and engineer are made to see consequences for their inaction and/or bad judgement calls.
@veramae4098
@veramae4098 10 ай бұрын
@@ericenfield2193 [gloomy] I doubt any consequences. And no doubt the owner uses the building collapse / demolition as a big tax deduction.
@frankmiller95
@frankmiller95 10 ай бұрын
"l am an old woman named after my mother My old man is another child that's grown old lf dreams were lightning, and thunder were desire This old house would have [fallen] down a long time ago" With apologies to John Prine
@rayshideler1193
@rayshideler1193 10 ай бұрын
Whether or not a steel column is in the wall seems like a pretty important detail that the engineer should have been able to determine.
@veramae4098
@veramae4098 10 ай бұрын
Kudos to the contractor who refused to do just a "face" repair. When the owner refused his bid to do it right, he refused the job. I'll bet he's SOOOOOO glad he did!
@rayshideler1193
@rayshideler1193 10 ай бұрын
@@veramae4098 Yeah I bet he's glad the owner refused his bid. That building was a can of worms that somebody already screwed up
@arthurmoore9488
@arthurmoore9488 10 ай бұрын
@@veramae4098He's also the one who documented everything and warned everyone. My feeling is the building inspector was leaned on by the mayor.
@crazedmonk8u
@crazedmonk8u 3 ай бұрын
i'm not even an engineering but it would have taken a few mins to figure that out with a portable x ray machine or more specifically a "through contact wall radar survey device" you see building contractors use to assess stress cracks in concrete , find conduits etc etc and stuff would have given you the answer. or heck probably even a stud finder/metal detector could do it if it was strong enough to get through the brick.
@night_owl365
@night_owl365 10 ай бұрын
Don't apologize for long videos. I didn't even realize it was 50 minutes because I was so engaged in what you were explaining. Thank you!
@BuildingIntegrity
@BuildingIntegrity 10 ай бұрын
I appreciate that!
@roseduste80
@roseduste80 10 ай бұрын
There's a video from two months before this collapse of a facade coming away from the wall of an apartment building in New York. The building was immediately evacuated. I don't understand why this one wasn't also. The negligence from all parties is astounding.
@veramae4098
@veramae4098 10 ай бұрын
There was an evacuation order, but some people refused. It's hard to be poor.
@ct92404
@ct92404 10 ай бұрын
We can criticize the way the building was originally constructed back in the 1900's, without steel columns...but it is impressive that the building actually did give PLENTY of warning before it collapsed. I can't believe it wasn't evacuated.
@jeannet.9125
@jeannet.9125 10 ай бұрын
Six lawsuits and counting...
@SandrA-hr5zk
@SandrA-hr5zk 10 ай бұрын
Future engineers need you as in instructor. I would take a whole semester with you just to go over engineering failures. A) how to spot the failures and B) what could have been done to prevent it. You're an amazing teacher, even if this is just what you do for work. Being smart doesn't always mean people can convey it to others. You do a phenomenal job of explaining it.
@patriciapetersen904
@patriciapetersen904 10 ай бұрын
Exactly my thoughts. A gifted communicator!
@rcpmac
@rcpmac 10 ай бұрын
Isn't that exactly what these videos are?
@SandrA-hr5zk
@SandrA-hr5zk 10 ай бұрын
@@rcpmac But it's different to sit in a classroom and to be able to have conversations with the professor and fellow classmates. I absolutely love his videos. But we need engineers that are as smart as him entering the field, and not learning from the ones that like to take short cuts that cause these catastrophes.
@arthurmoore9488
@arthurmoore9488 10 ай бұрын
@@SandrA-hr5zk In my experience, it's the difference between undergrad and grad school. Undergrad is closer to high-school where the instructor knows you didn't read the text book, so has to go over what's already there. Meanwhile, in one of my grad school classes the instructor had us read 100 pages of "The Goal" before our next class so we could talk about it.
@TheColinputer
@TheColinputer 10 ай бұрын
In short, due to a lack of proper shoring while doing the repair work. They took a structure that was designed to handle vertical loads. And made it take diagonal ones. Shearing the structural brick and causing to crumble
@TexanMiror2
@TexanMiror2 10 ай бұрын
I hope the city officials, engineer, and owner, all of whom are responsible for this murderous idiocy, go to jail. No care for their craft, for their responsibilities, and for the human lives their decisions affect. Thank you for making these videos, you are amazing at explaining complex topics and breaking them down into understandable chunks. Still, no matter how good you are at explaining - it's disturbing how intuitive this structural problem here is. It should be obvious to any random person, that you cannot just assume a 100-years-old brick wall is supported by beams, and that you cannot just leave entire brick wall segments largely unsupported, and that the failure signs shown in the images are obvious indications of a major structural issue.
@Keirnoth
@Keirnoth 10 ай бұрын
Creators have proven long form works if and only if they are good at being a great teacher or provide something interesting and worth listening to or learning about. You are an example of that. Take as long as you need.
@Odontecete
@Odontecete 10 ай бұрын
This was amazing especially about the load shifting and I'll tell you why. I lived in an older building with a partially exposed underground parking structure held up by steel ibeams connected to brick walls. We got a blizzard that dumped 2' of snow. The garage roof had roughly 50' of it down the length covered in 8' of snow (drifts..etc), plus all the snow on the roof. During that storm three of the support steel pylons fell OFF their support due to the weight of the snow and the rust that had eaten them. The entire corner of the 2 story building fell about 4" when the supports fell. The apartment management company (truly shady operation) called out a structural engineer, I was there and heard him say: this needs to be addressed immediately. Was it? No. I left as soon as I could. Found out later the management company collected the insurance money and their fix was to put up 2 floor jacks. Nothing was said to the residents ever. Despite the concrete falling off the walls of the stairway that led to the underground parking garage.
@andrewtaylor940
@andrewtaylor940 10 ай бұрын
I'm not an Engineer. Well I have some Firefighting Engineering Credentials. Including some classes and lots of training on inspecting a building, reading a building and knowing when to get the hell out of a building, or to not go in. I've spent some light duty time doing Code Enforcement and inspections. So by no means a Civil or Structural Engineer. But a fairly well educated layman. These pictures scare the hell out of me. And I think what scares me more is there would have been a real Engineer standing there telling me that I was worrying over nothing. One of the tricks I was always taught for fast assessment of a building when pulling up on a scene is to quickly look for the buildings lines. Find the corners, find the window frames and doors. Is everything still plum? At proper straight lines and perpendicular to each other. No Curves is a big one. Do all the windows line up as expected are door frames straight? This is just the quick 123 test you do as you are walking up to any unknown building on a fire call. And boy would this fail my quick test. Setting eyes on the interior face of the supporting walls. That's the point where you very gently get your crew to take careful babysteps to the nearest exit while you have the trucks start blowing the evacuate alarm. That stuff going on at 34:10 I would have spotted that, in the dark. And I'm a complete idiot with structures.
@stillraven9415
@stillraven9415 10 ай бұрын
My experience in college was that 2/3rds of the people in my classes only passed because people who understood things helped them. They could never figure out anything on their own, yet they passed anyway.
@royalnuts
@royalnuts 10 ай бұрын
My experience from civil engineering class 10yrs ago was about 90% of the students were already happy when they made it on the skin of their teeth while studying less as possible. Mostly lazy and uninterested, not doing more than asked or necessarily. Most were addicted to side jobs for earning just a bit money and party afterwards. lol
@fiedwards2462
@fiedwards2462 10 ай бұрын
Thank you for answering my question, the lack of analysis by the engineer is a consequence of lack of knowledge & depth of understanding.
@bookcat123
@bookcat123 10 ай бұрын
That’s because schools always rely on memorization rather than understanding. Don’t ask me what this formula means or why it works! Just memorize it and regurgitate when told to!
@stillraven9415
@stillraven9415 10 ай бұрын
@@bookcat123 😆
@ZGryphon
@ZGryphon 10 ай бұрын
As several of my classmates in various eng tech courses used to remark philosophically when test grades came back, "Welp, Cs get degrees!"
@lindsayrixon7402
@lindsayrixon7402 10 ай бұрын
Breaking down a complex situation for those of us that don’t have your qualifications, into something we can fully understand, is what makes these dissections so interesting. Thank you for your time and effort. Regards from OZ 🇦🇺
@thatclintguy
@thatclintguy 10 ай бұрын
You should be teaching at a top engineering school. I'm an electrical engineer with an interest in civil and structural engineering. This video was a great "lesson" on load transfers and stress flows. Well done!
@Julia-543
@Julia-543 10 ай бұрын
Josh, if one of your clients is willing to allow you to share your process in your day to day practice, I think it would be extremely educational. How do you keep an open mind and avoid confirmation bias? What errors by other engineers do you most commonly run into? @thatclintguy If you have an interest in civil and structural engineering and haven’t watched his videos on the Champlain Tower collapse, I highly recommend watching them. I understand Josh has his own firm that is busy due to the new rules put in place to prevent another CTS from happening, but whatever can be done for Josh to teach the most engineers is what I want for the sake of my own safety!
@michaelimbesi2314
@michaelimbesi2314 10 ай бұрын
This was an excellent video. It’s like a case study happening almost in real time. And as a naval architect, it’s always interesting to learn about how structures on land work, especially because masonry structures behave so differently from steel. Thank you!
@auroran0
@auroran0 10 ай бұрын
This video is giving me Hyatt Regency walkway vibes. Great work and a great explanation.
@ninjaneerk5601
@ninjaneerk5601 10 ай бұрын
Hopefully the consequences to the engineer will be the same.
@fiedwards2462
@fiedwards2462 10 ай бұрын
The engineer's failure to acknowledge what was happening is infuriating & incredible. How did he not understand the building at all?
@davidaxe7635
@davidaxe7635 11 ай бұрын
Another fantastic video, Josh. Gripping. Am always excited when I get a heads-up you’ve posted something new. Don’t apologise for the length - I love your clarity and focus and your measured delivery. Thank you.
@lorettavanhaasteren2776
@lorettavanhaasteren2776 11 ай бұрын
Wow you did it again! This presentation is like what you did for me with the Champlain Towers collapse. It made me see how complex and detailed analysis is needed BEFORE the building falls down in addition to after. Thanks.
@aday1637
@aday1637 10 ай бұрын
Interesting that you and I reached the same conclusions. Having worked for a company that did sheeting, suring, pile driving and underpinning, I got to see the correct ways to consolidate loads without losing the structure or damaging it. As I see it the only way to accomplish the necessary work was to vacate all the apartements in the affected area so as to allow for installation of temporary support from the ground all the way up, then to replace existing support. In my mind there was a reluctance by the owner to do this correctly as it would have caused a loss of cash flow from those apartments where work was required. I don't see any other way to correct the decay without this procedure. And it might have entailed doing this along the entire perimeter of the building wherever support columns existed. Essentially, rebuilding the structure with new support, throughout. And at that point you have to ask yourself, as the owner, is it worth saving the building at all. But to allow occupancy until the demise occurred is criminal, in my mind. Don't know who paid the engineer who made recommendations but there seems a bias in his opinion or even worse, perhaps a lack of knowledge.
@user-bu2mn8do6v
@user-bu2mn8do6v 10 ай бұрын
I run a small business in underpinning, mini piling(restricted access), foundation repair, structural steel and concrete work and i have seen some bad situations but seeing the picture of the windowframe bulging inwards would put me in "shit is hitting the fan, big time" mode and steel props and shoring would be going in the same day. And all the plasterboad and everything infront of the structural brickwork would go out to see whats happening
@DeirdreSM
@DeirdreSM 10 ай бұрын
Dude, I *love* your long explanations. I know nothing about structural engineering, but as a mathy person who's fascinated by how things fail (and thus secondarily how they work at all in the first place), this, like all your videos, was awesome.
@kravenscroft4133
@kravenscroft4133 11 ай бұрын
I always come away from Josh's videos so much smarter. You truly one of the best teachers I have ever witnessed and you have ignited my interest in engineering and desire to forensically analyze these building failures. Thank you Josh.
@solarnaut
@solarnaut 10 ай бұрын
BUILDING INTEGRITY ! This is the kind of thing the internet should be doing ... sharing REAL information and cogent analysis of what went wrong so that WE THE PEOPLE can LEARN from mistakes and IMPROVE going forward. Sadly too much of the internet is cluttered with false and misleading babble.
@PrincessPattyPumpkin
@PrincessPattyPumpkin 10 ай бұрын
I'm not an engineer or anything of the sort, but I find all this fascinating. Thanks for explaining it so an average person can understand.
@ryanwhelan6874
@ryanwhelan6874 10 ай бұрын
The negligence/incompetence here is stunning
@jeannet.9125
@jeannet.9125 10 ай бұрын
As a citizen of the United States, and of Davenport, Iowa, I just want to thank you for the time and effort that you put into this excellent presentation, particularly regarding the failure of providing adequate structural supports. A sixth lawsuit has recently been filed; I suspect it will not be the last. (The warnings, and shoddy workmanship have been noted.) Parts 1 & 2 have been shared to one of our local pages dedicated to the collapse and the corruption.
@SteamCrane
@SteamCrane 10 ай бұрын
No apologies. The video was as long as it needed to be. No unnecessary filler. Absolutely clear analysis.
@ebenezersasquatch4597
@ebenezersasquatch4597 10 ай бұрын
I didn't realize how complex this entire incident was. This was very eye opening.
@peterhughes3648
@peterhughes3648 10 ай бұрын
I am an engineer and I love this channel. Brilliant, clear, and honest explanations of physical facts. What happened to the engineer that designed the repair that apparently lead to the subsequent colapse?
@ninjaneerk5601
@ninjaneerk5601 10 ай бұрын
My guess is that he will not be an engineer for much longer. I'm betting that he will have his license pulled in every state that he has a license.
@captiannemo1587
@captiannemo1587 11 ай бұрын
Makes me value my old 1903-1910 International Correspondent School books covering construction and wall design.
@JH-tc3yu
@JH-tc3yu 10 ай бұрын
Really sad we will be seeing less of you in the next few months, but I'm super thankful for all the time you spent to put these together. Really makes a huge difference even as just a homeowner, I'm now constantly aware of structures I'm in and paying close attention to how my own house moves or shifts.
@SteamCrane
@SteamCrane 10 ай бұрын
I missed that Josh will be taking a break? Hope it's for something good. Any more info on this?
@mhh7544
@mhh7544 10 ай бұрын
I m construction worker from Finland , and your channel have been a reason why I ve taken interest in building engineering.
@ericcox6764
@ericcox6764 11 ай бұрын
Thank you so much for this video and all of your hard work producing the content on your channel. My construction is basically limited to decks and small projects. I’ve always tried to do the best job and give my clients a quality project. Your analysis of building failure is really helpful as you point out many factors that a lot of contractors might not see. Because I tend to slightly overbuild, I’ve never had any issues with anything I’ve built. Hopefully everyone in the construction trades can learn from these very educational videos. I’m looking forward to the next episode.
@wtmayhew
@wtmayhew 10 ай бұрын
Thank you for taking time to share the analysis. It is too bad the contractor was not in a position to have more input into the design of the remodeling. I’ll bet the laborers on the job could easily look up and intuitively understand that several stories of unsupported layers of brick between the new CMU wall sections wasn’t going to stay floating there for long. This disaster shows that bilateral communication channels need to be built into projects like this so that oversights don’t become disasters.
@philnichols5611
@philnichols5611 10 ай бұрын
Excellent as usual Josh. I have followed your KZfaq presentations for some time now, starting with the Surf side collapse. What I'm also looking forward to is any follow-up on the Milleniuim Tower in San Fransisco. As a retired consulting electrical and mechanical engineer I worked with several different structural engineers in the design and construction of commercial buildings. I remember during my early years I worked with a structural engineer in North Dakota. As a young inexperienced engineer I asked him if his design would "work". His answer was " I hope not". He patiently explained to me that work was force through distance, and he " didn't want anything to move". Keep up the good work.
@mikapeltokorpi7671
@mikapeltokorpi7671 11 ай бұрын
I watched this video hair raised in my head first 30 minutes straight. Maybe this is why we got building tecnology history classes in our HVAC engineering classe (🇫🇮). It really looks like the design engineer here did not understand how 100 years old wall works. Cotractors were more alert, so I would not blame them. Most likely result here is, that the engineering design company is found 100% at fault in court. You should not pressure wash the brick walls (at least full speed and perpebdicular to the wall) as you saturate the bricks' cavities with water. And you should not paint the brick (at least with modern plastic based paints) as those are functioning as steam barrier and screws up hygroscopic operation of the wall. The collapse was so fast, that rhis was not factor for the collapse - but may of been cause of the earlier damage.
@_PatrickO
@_PatrickO 11 ай бұрын
It is a shame if the building owner gets to use their bottom dollar engineer as a scapegoat. It took a long time of neglect for this dangerous issue to exist. That engineer is not solely responsible for the years of neglect. The owner is responsible for relying on a single person's assessment and is responsible for the lack of maintenance that led to this. People tell you to get a second opinion on any major repair to your own home. A building owner doesn't get more than one assessment for something this critical? I would put blame 50% on building owner, 25% on engineer, and 25% on the contractor that finished over clear issues. Had the building been maintained properly, this cannot happen.
@LTVoyager
@LTVoyager 10 ай бұрын
Not sure where any steam is coming from. It serves as a vapor barrier, but not a steam barrier.
@myoldvhstapes
@myoldvhstapes 10 ай бұрын
(Sees your avatar photo) Hair?
@jezackr3500
@jezackr3500 10 ай бұрын
@LTVoyager I am fascinated to hear what you think steam is xD
@littleponygirl666
@littleponygirl666 10 ай бұрын
We do? I'm a fellow Finn and currently studying HVAC engineering and we sure as shit don't have that kind of classes.
@jakebrodskype
@jakebrodskype 10 ай бұрын
I learn more from your videos than I do from most Professional Engineer education videos. Thanks!
@akarhu
@akarhu 11 ай бұрын
Thank you so much for these videos! My background is in engineering (BEng in IT & MSc in EE; structural and mechanical only by practice), however, I've spent most of my professional career so far in administrative and financial roles. Nothing wrong in them, I don't mean that, but this drive you show, the need to understand how things work, and how we may or may not make them work, really makes me to want to get back into my roots.
@bobjohnson2172
@bobjohnson2172 10 ай бұрын
The engineer who was having the Building get away from him, he needed to ask other engineer friends to take a fresh look at the Building. He needed fresh sets of eyes to look at these escalating problems.
@edwardbrooks661
@edwardbrooks661 2 ай бұрын
There was recently a partial building collapse in a neighboring county, and the building is constructed similar to this one, with the beams (wood, in this instance,) bearing directly on the brick wall, which collapsed. This is a fantastic video series about this incident in Iowa, and you've absolutely earned yourself another subscriber!
@judydenver5362
@judydenver5362 10 ай бұрын
Josh, this was very engaging, and highly detailed and entertaining, I learned so much!! Please never apologize for length. When things are important, and great info, it is limitless and fascinating. I hope you submit this to the city, over there to take a look at it, because they seem to not have the capability in their local builders, inspectors, and contractors, to know what they are doing. this is everything that happened, that they need to know, and they did not need to tear the rest of that building down, like they did. This incident is horrific, as folks have died. so terrible.
@Rekless70
@Rekless70 11 ай бұрын
Excellent content! I commented about your conretes worst enemy video earlier this year, and you replied. It was a pleasure to chat with you. I recommend your channel all the time, and have learned alot from you! Thank you.
@BuildingIntegrity
@BuildingIntegrity 11 ай бұрын
Thanks!
@quesoestbonne
@quesoestbonne 8 ай бұрын
​@@BuildingIntegrityone thing that stands out is the hollow bricks (at 42' 24") used in the "structural" part of the wall. Those hollow facing bricks should never be in the structural part of any wall especially of multiple stories.. It explains why as they fracture the broken pieces no longer fill the space and collapse leaving a cavity - that was initially very puzzling, where did the space come from?. Solid bricks would have cracked/ shifted but still filled the space. It could well be this building was catastrophically doomed from these hollow bricks failing before the repair process. Another thing to note is the new addition of what looks like new steel studding to support drywall inside (at 40' 52"). This means drilling or more likely shooting anchors into the "structural brick" part of the wall to install it. Such drilling/shooting will severely weaken those thin walled hollow bricks over the whole wall. That would be another aspect to examine in detail.
@danielboyd4079
@danielboyd4079 11 ай бұрын
Fantastic video, as always. Definitely one of my must-watch channels on KZfaq. Have a thought for a 'Part 3' in this series: At various points during the timeline leading up to the collapse, what would your recommendation have been to repair the building correctly? And at what point do you think the building passed the proverbial "point of no return?" And also at what point should the building have been evacuated?
@johnburgess2084
@johnburgess2084 10 ай бұрын
Oh, those were STRUCTURAL bricks? (Sorry, I could not resist. Thanks for the wonderful video!)
@KatrinaGressett
@KatrinaGressett 11 ай бұрын
You analyses are always so thorough and excellent. While I don't hope for disasters, I look forward to your analyses when there is a collapse.
@Byzmax
@Byzmax 10 ай бұрын
It's exactly this sort of analysis that should have been done before starting work. This sort of half arsed approach is far more common than people realise. People often think they know more than they do. Great video
@theborg6024
@theborg6024 11 ай бұрын
been waiting for this! can confirm it was worth it as well, detail is what makes this channel special :)
@timgerk3262
@timgerk3262 10 ай бұрын
Info note, on west coast we'd use terms "unreinforced masonry" and "veneer brick." Seismic considerations would have put this project in front of a specialized engineer and had the full attention of building department. Likely the building would have a yellow tag (unsafe to enter, do not occupy, repair immediately) or red tag (demolish as matter of public safety) when eyes were laid on that rotten bearing wall. Florida wins most-cautious award, though, for the required periodic reinspection.
@slingerland3g
@slingerland3g 10 ай бұрын
Your content shows the dire need of competent structural engineers, as they save lives!! It is sad with news of buildings falling over, that all of that could have been prevented. Very sad.
@brianam7471
@brianam7471 10 ай бұрын
Incredible video. Thorough, not long, extremely informative and evidence based. It’s a shame that every municipality doesn’t have a building engineer like you on staff to catch these tragic oversights.
@farsicalspeaking3356
@farsicalspeaking3356 10 ай бұрын
As always, a thorough and believable analysis of what went wrong in this collapsed building and in the professionals (private and city) responsible for this disaster. I just watched the short but detailed KZfaq video by Mike Bell and he was able to slow down the video of the building's final 9 minute slow-mo collapse. This showed two major things: 1) that second-by-second you could see the silly wooden "braces" were actually moving and zinging before the fall, and 2) that there were about 6 other noticeable puffs of dust indicating bricks as they turned into powder and the building load shifted to other bricks that then powdered and crushed. One news article I read on-llne indicated that the actual repair work on the building was done by a masonry company owned by the building's owner, Andrew Wold,. Wold is being sued by at least 6 parties for negligence...a real "bad actor" as you say Josh.
@timgerk3262
@timgerk3262 10 ай бұрын
The psychological/political issues deserve some attention. An engineer is paid (sometimes) to write a report that suits the client. The paragraph the began "The main takeaway..." is a screaming code word for what the unsophisticated client demanded to hear. Integrity is corrupted by magical and complacent thinking. Paraphrasing: A man will believe anything if his paycheck depends on it.
@schumannresonanceswithverte
@schumannresonanceswithverte 10 ай бұрын
prayers to anyone who lost their life here. relative to the construction, OMG, what crappy construction methods. looks like the best thing to happen to that building was for it to have collapsed. Thank you for taking the time to go through all the details. Your knowledge is fascinating. keep up the good work.
@terry94131
@terry94131 10 ай бұрын
Another fine post Josh! Thank you so much. A few blocks away from me, the entire brick side of a masonry 2-story house peeled off last week; a similar situation where material was falling into the void between the structural block and the brick facade.
@alisonwilson9749
@alisonwilson9749 10 ай бұрын
We heard a rumble one evening, thought it was a rather loud roll of isolated thunder, and a few days later I walked past the cause- the top 2/3 of the outer sandstone layer on one end of a terrace of houses had fallen off. Onto a few cars, which were rather squashed. The terrace was 2-storey and would probably be about 100-120 years old. It took some time to rebuild it, one hopes they put some hefty stainless steel ties in it to tie it to the existing wall...... The inner wall, mostly brick, with chimney masonry that was rather interesting, looked in excellent condition, didn't look to have moved at all.
@TheDuglas63
@TheDuglas63 10 ай бұрын
Josh, never apologize for going long on your videos, us less than knowledgeable folks love your in-depth explanations. This forensic investigation is some of your finest yet, Thank you.
@Odin029
@Odin029 10 ай бұрын
On a much smaller scale, I called in some contractors to look at a house built around 1898 and got a quote for some work. The price wasn't too bad, but something didn't sit quite right with me. So I called out a retired contractor friend who'd done a lot of work on older houses. His estimate of repairs was triple what the original contractor's was and it wasn't because he was trying to be expensive. It's because his eyes saw things that needed fixing that the contractors who work on more modern houses didn't even notice or didn't know about.
@piast99
@piast99 10 ай бұрын
Excellent analysis! I am shocked at the original repair design. I am an engineer from completely different field but I can follow the logic. I am also amazed by the lack of the attention by the repair design to the loads. My neighbour has his brick wall little two storey house modified and they put more attention to transferring the loads from the wall above while modifying the window opening. And here you have the huge, complicated building and design that doesn't take the wall thickness into account.
@Joel-st5uw
@Joel-st5uw 10 ай бұрын
Incredible analysis. This kind of rigor and detail is what separates good content from "most everything else". I usually relax through 45+ minute videos, but this one had me on the edge of my seat, the *whole time*. Terrific video, thanks for doing this hard work.
@wgmskiing
@wgmskiing 10 ай бұрын
Quote from the mason that warned people about the imminent collapse: ""Andrew contacted us to give them a bid on the back of the building to repair the exterior masonry that was crumbling and falling," Shaffer said. "Our bid was to support the building all the way up, replace the section of wall on the inside that was missing and then redo the façade of the brick on the outside." So it appears that the (higher bidding) trades were aware they needed to properly shore the whole load, it's bizarre to me that an engineer wouldn't understand or recognize that. Actually, I think if you took a random person off the street and explained that you wanted to cut away an entire section of a large building wall at the base, their first question would be "how do you support it so it doesn't fall down?"
@zachansen8293
@zachansen8293 11 ай бұрын
Where's the followup on the "did I find a $100000000 mistake" video? What did they say when you reached out to them?
@BuildingIntegrity
@BuildingIntegrity 11 ай бұрын
Nothing. Myself and other engineers that reached out to the SF building department and officials never received any response.
@zachansen8293
@zachansen8293 11 ай бұрын
@@BuildingIntegrity Did you do a FOIA? Did you reach out to any local news stations? That process would be super interesting, too.
@KR-hg8be
@KR-hg8be 10 ай бұрын
​@BuildingIntegrity the news about the leaning tower of Frisco sure doesn't instill confidence in how the entire process works in that city.
@ColorfulHalo
@ColorfulHalo 10 ай бұрын
I don't know how I even landed here (thx yt algorithm?) but have been binging your videos for days now. Really awesome content: informative, understandable for a layman (not a native speaker, I've been learning loads of new words haha) and straight to the point. Very educational. Subscribed and looking forward to more!
@billrimmer5596
@billrimmer5596 3 ай бұрын
I certainly miss your videos. I hope no one pressured u to stop. I also hope u can make money in this forum.
@bertmacdonald337
@bertmacdonald337 10 ай бұрын
Well, what to say here. This looks like Amateur Night for Engineers. This is what happens when jobs are carried out to save cost. I`ve done many such refurbs in my time and I wouldn`t go near this without a custom made steel support structure to take all the floor loads away from the brickwork. Doesn`t need to cover the whole facade, it can be carried out in sections. Trying to do this with strongbacks and props tied together is possible if you know what you are doing and have a capable engineer on board. I`ve dropped the spine wall on a ten storey building but I relied on more than good will to hold it up till the new structure was in place. The photo with those lightweight props under the window heads tells me all I need to know. Thanks again for a very interesting two parter!
@worawatli8952
@worawatli8952 10 ай бұрын
31:20 I'm not an engineer, but a designer, this is something new I learnt today, caught me by surprise of how these brick building works, it isn't like regular steel structure or re-enforced concrete structure, the loads aren't transferred point to point, but more of flowing around.
@heathwirt8919
@heathwirt8919 11 ай бұрын
After viewing the first part of the investigation, I questioned why the original structural engineer didn't use a full steel frame as opposed to relying on a thick brick wall for load bearing. Then realizing the build lasted 106 years and didn't fall down until an improper repair was made makes the case for the brick load bearing wall. Perhaps this design was standard practice at the time it was built.
@dandydenni1615
@dandydenni1615 10 ай бұрын
I love the long videos! Never apologize for the length Josh. Many of us want long form content vs short videos! You rock!
@lindseydejesus1877
@lindseydejesus1877 10 ай бұрын
this continues to be one of the most thoughtful and well-researched channels I've ever found. thank you for making amazing videos!
@pulaski1
@pulaski1 10 ай бұрын
The lack of awareness of the engineer of building techniques in the early 20th century seems bizarre to me - I am neither an engineer, nor in the construction business, but even I am aware that 100-120 years ago, it was common for buildings up to 10 storeys to be built with a load-bearing perimeter wall. I don't even know _how_ I know, but I had assumed it was common knowledge that that was how buildings were built back then.
@flaminica88
@flaminica88 10 ай бұрын
Have you looked more deeply into the early history of the building? Because I suspect those bricked in windows on the west face were originally loading bay doors. The tall thin profile fits the shape of a turn of the last century horse-drawn cargo lorry. The location in the building, at the rear and immediately below the less desirable service quarters also fits. Then, as now, a loading dock area would have been noisy and smelly and not something you would have wanted around the guests. It would also explain why they, and none of the windows around them, were bricked in when the area went out of use. If this is the case, there could have been very old cumulative damage in the area from decades of minor collisions, and cargo and trash being hauled in and out.
@snaredude56
@snaredude56 10 ай бұрын
I have worked with very well degreed engineers with very impressive resumes: mechanical, electrical and optical, who lacked basic common sense and any sense of urgency so unfortunately this situation doesn't surprise me. People have asked me why it is so hard to find a good contractor. People would often cite Norm and Bobby and the other contractors on This Old House as being what they expect. I tell them that for every Norm or Bobby, there are at least 100 numbskulls who don't have a clue working as contractors. The same goes for engineers. For every Josh Porter, there are probably 25 that are just passable at doing their job. I give that a lower ratio because to be an engineer, you have to at least be able to obtain a degree so that will weed out a bunch of people.
@McTroyd
@McTroyd 10 ай бұрын
Geez. I guess it's a testament to how well the building was built that this collapse didn't drag down the rest of it. What little I know of structural engineering comes from your channel, Josh, but I have a feeling that a more modern building would still be standing after this. (Maybe CTS illustrated this?)
@TaraTheFox
@TaraTheFox 10 ай бұрын
Fascinating!!! Never would I have imagined the problems with the single vs multi story shoring, it's excellent to be able to learn from an expert in the field. Thank you :)
@gabrielalamberti5860
@gabrielalamberti5860 10 ай бұрын
Brilliant analysis and investigation sleuth. I'm in construction and this an amazing lesson from you. I learned a lot. If I ever see a droopy window I will run ada fast as I can. 👏👏👏👏
@rcpmac
@rcpmac 19 күн бұрын
Missing your contributions to this KZfaq channel. Hope everything is going well for you.
@JustMeUpNorth
@JustMeUpNorth 4 ай бұрын
Excellent and comprehensive as always. Thank you so much! It’s so frustrating that people were hurt and killed because the OBVIOUS signs of impending collapse were ignored. Even if the building/repairs done at first were poor, there’s no excuse for ignoring the cracking and slow collapse of the wall that happened afterwards. We had a patio door out in the back wall of our red brick house. The shoring was unbelievable, even if it was only there for a short while, and it took three huge lintels to transfer the loads. I’m no building engineer, but seeing the ‘repairs’ here it seems obvious that the load bearing hasn’t been considered at all by the original repair designers? Or did they believe the arched brick over the window would somehow magically hold everything up? It’s insanity. They just blocked up windows, no structural repairs at all!
@MegaMech
@MegaMech 10 ай бұрын
It's a testament to the buildings original design that it held out for as long as it did despite the beating it went through.
@klonik79
@klonik79 10 ай бұрын
We had same issue, when we were doing reno and adding floor to our building (built 1908). Young architect (early 30') thought he can remove about 2m (7')of brick for elevator where there were originaly narrow windows. Older structural engineer (architects can work only on 2 floor buildings without one here) had him fired on the spot. (There was host of other issues on top this one) Thing is, most younger people in industry have no idea on how bigger than small 1 or 2 floot brick buildings work. A lot of them thinks it is reinforced concrete skeleton infilled with bricks. And I know for fact, that on architecure course they mentioned these like on one short lesson (45min) from a friend. And there are a lot of these (several hundred) in city center here (built between middle ages up to 1940's) including some palaces built in 1200's and 1300's. Our office for preserving National historical (and cultural) artefacts, since added requirement of having done some knowledge test or experience working on these for architects and structural engineers to lower their workload. Building does not to be marked As of national historic importance (like palaces), it just needs to be on their list , pretty much everything bigger than family house built before 1914 and most up to 1950 is on the list. Office has their own engineers that need check and approve any permits for these including such minor things as replacing doors and windows as on most of these you need to keep visual appearance for example.
@jackielinde7568
@jackielinde7568 10 ай бұрын
I know in accident investigations, groups like NTSB try to recreate the mindset of the people at the time of the incident. We know after the fact that the wall was much wider and designed as the primary conduit of structural load from analysis. I'm interested in how the engineer got this so wrong? Wouldn't they have gone into the building to look at the site from both sides? Wouldn't they have noticed the width of the wall? And isn't pulling the building's drawings on file with the city part of the process to come up with the repairs they were planning? Is there a situation where these wouldn't need to be done? While I think we can agree that the engineer may be inept and this isn't a work of malice, what would cause them to ignore things like building plans when they had basic questions about structure?
@marcgarrett4401
@marcgarrett4401 10 ай бұрын
This rapid acceleration of collapse had to have made scary noises people in the building heard.
@kkim4106
@kkim4106 10 ай бұрын
Thanks for making this video. I am always a fan of your videos. I learned many new things as a structural engineer. Just a quick opinion. From 31:15, what I understood was that replacing the old structural brick part with post shoring affects the loading path of the above floor. However, if we solely consider this loading path change, and set aside all other aspects of this building, if the post shorings on the first floor are sufficient to replace the demolished structural brick, the loading path above shouldn't change significantly. If you want to modify a corner column on the first floor of the 10-story building, you don't need to post shore all the way up the 10 stories, but rather provide enough shoring to the adjacent area of the column on the first floor during construction. I am happy to hear different opinions.
@jagmarz
@jagmarz 10 ай бұрын
This was a really interesting analysis. I didn't really get why the loads for the upper parts of the building wouldn't transfer to the new CMU until you reviewed it a second time, and I realized that the structural load will ALWAYS be there (even when the CMU isn't), so just filling the remaining space with the new CMU will leave the building in the distorted condition (from when the CMU wasn't there), with the loads shifted.
@PuckDudesHockey
@PuckDudesHockey 10 ай бұрын
I can't believe it -- despite all of its problems, this building was literally screaming the warning signs of its imminent collapse to anyone who bothered to listen. As a non-engineer, I don't feel like some failure events (such as Surfside) appear quite as obvious in terms of the warnings to a layperson. But in this case, you don't even need an engineering degree to see how dire the situation was. Can't believe they weren't closing the building up at least until they could get it stabilized.
@scofab
@scofab 10 ай бұрын
Agreed right down the line... you've *got* to get the load off first. Well done as always, thanks again Josh.
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