Miami Condo Collapse: FAILS Code By 50%! NIST Update

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Күн бұрын

Jeff Ostroff analyzes the latest NIST engineering investigation updates into the Champlain Towers South Condo collapse in Miami, FL. This engineering update was a public meeting of The National Construction Safety Team (NCST) Advisory Committee on June 14-15, 2023. NIST leadership updated the committee on the progress of NCST investigations focused on the Champlain Towers South partial building collapse that occurred in Surfside, Florida on June 21, 2021.
📺 Warning Signs: SHOCKING Condo Damage Days Before Miami Collapse
• Warning Signs: Huge Cr...
💻 Miami Herald Article "Surfside tower was flawed from day one. Designs violated the code, likely worsened collapse":
www.miamiherald.com/news/loca...
💻 Surfside condo was ‘screaming’ as an alarming crack formed just weeks before the collapse
www.miamiherald.com/news/spec...
💻 NIST Public meeting videos mentioned: www.nist.gov/disaster-failure...
00:00 Into to NIST Champlain Towers Condo collapse Update
00:50 NIST Primary Storage Facility moving condo collapse debris
02:02 Rebar Rods crowed in concrete columns
03:54 Update on security camera videos and DVrs from Champlain Towers south
06:55 Code check and under design violations
08:31 Building Demand Capacity Ratio is off by a factor of 2
11:59 what about Champlain towers North Condo?
13:39 NIST focusing on the pool deck from K to M columns
15:56 Conspiracy theories
16:41 Toyota Supra destroyed in Miami Condo Collapse
18:29 Rebar rods buried too deep in concrete slabs
20:01 Palm trees and planters were added to the pool deck in 1996
22:27 Excessive paver sand thickness and installation over old tiles
24:31 Corrosion in column rebars

Пікірлер: 844

@chuckmiller5763 10 ай бұрын

I built bridges in Arizona for ADOT, the engineers were always picky about rebar spacing and explained it this way, if you had a rebar spacing of 6 inches x 6 inches, and 1 bar is off just 1 inch, you lost 20% of strength in that now 7 inch space. It doesn't matter that you added strength where the rebar is closer to another, the space that spread is now weaker. The rebar has to be spaced properly.

@billj5645 10 ай бұрын

I've worked in reinforced concrete for a long time and I'll tell you that this is BS. It is the total amount of reinforcing that counts, not the spacings between individual bars. If you really want to blow your mind, study how the code prescribes placement of reinforcing steel in 2-way slabs such as Champlain Towers, then look at how post tension reinforcing is typically placed these days in banded vs. uniform layouts. In one direction 80% of a floor slab will have no post tensioned reinforcing.

@chuckmiller5763 10 ай бұрын

@@billj5645 This is why you are not the engineer. Obviously the spacing matters.

@billj5645 10 ай бұрын

@@chuckmiller5763 I am an engineer and I've been working on reinforced concrete structures for 46 years. Tests have proven that it is the total amount that matters, not individual spacings. I've seen those tests performed when I was in college. The building codes don't have any requirements of that type for spacings of slab reinforcing.

@chuckmiller5763 10 ай бұрын

@@billj5645 So, the Arizona dept of transportation bridge engineers are wrong? I think its obvious if you move one rebar farther away from another, that space in between is now weaker because it has less rebar, the spot next to it is stronger because it has more rebar.

@billj5645 10 ай бұрын

@@chuckmiller5763 You could ask them how many buildings similar to Champlain Towers they have designed recently. I work on up to a dozen a year.

@chumpchange1846 10 ай бұрын

Funny how the Florida county code inspectors caught none of this...also funny how many engineers and architects stamped the drawings. The county and engineers are just as liable as the condo board.

@user-pf5xq3lq8i 10 ай бұрын

Funny business with NIST told to look at everything except city hall. Stinks.

@TOO_TALL305 10 ай бұрын

Dude as someone who lives in dade county and had family members work honorably for it all I can say is this. Miami Dade County is probably the most corrupt county in all of south florida

@realharrykane2063 10 ай бұрын

My guess is that they don’t even do any regulating in these buildings

@KarynLewisBonfiglio 10 ай бұрын

How did they pass regulations with the renovations? Crazy.

@TheMonkeyNeuron 10 ай бұрын

They’re dead. It lasted long enough for them to get out from under liability.

@ginathacker6207 10 ай бұрын

Since I have a first floor condo, built in about 1962 near 52nd and Collins, I have been following Jeff and Josh with rapt attention. These 2 guys have been generally correct since week one of the collapse. My building is not dissimilar….14 stories, very large pool deck over parking garage, etc. Now, I and others watch every little crack and spall. At the moment, our certification requires a $19M overhaul. Deferred maintenance is a bitch!!

@electrictroy2010 10 ай бұрын

Probably cheaper to teardown the building & make a new one

@katiekane5247 10 ай бұрын

@@electrictroy2010the land is worth 19 million I'm sure. Billion dollar rebuild.

@danr9584 10 ай бұрын

Imagine how nervous the residents of Champlain towers North feel about the NIST findings. They likely have the same flaws.

@nepenthe_gal759 10 ай бұрын

With reports that insurance carriers have left Florida will high-rise condo buildings even be able to get insurance for the HOA, let alone individual policies for homeowners.

@lookforitcx 10 ай бұрын

@@danr9584 I was thinking the same. Their building is identical and no doubt with all the same flaws, if not worse. I'd get the heck out of there.

@cjmillsnun 10 ай бұрын

To be fair Josh was spot on. If it is right at the limit of punching shear with its dead weight, then it's probably half that required by code.

@jeffostroff 10 ай бұрын

Yes nist also had access to concrete, while Josh did not, allowing nist to refine their calculations further

@blitzmom2674 10 ай бұрын

and that was before all the residents modern remodeling with heavy tile, granite etc. Before it was probably linoleum or wall to wall carpet, and formica counters, not marble baths, granite or quartz counters, etc.

@MomMom4Cubs 10 ай бұрын

Your comment makes me feel cold inside.

@geoffh4861 10 ай бұрын

@@jeffostroff I think you misunderstood NIST's finding and Josh's claim. Josh said they were at loaded at 100% of their capacity. NIST said they were at 50% load capacity required by code. No doubt the building code requires load capacities substantially more than the dead load.

@rayray11939 10 ай бұрын

@@geoffh4861 So Josh was talking actual load capacity and nist was talking required load capacity. That makes sense.

@PRC533 10 ай бұрын

I did commercial construction for a decade, mostly vertical concrete including post-tension slabs and tilt-up walls. I can tell you that there were areas in some of the pours we did that it was impossible to get the vibrator into for proper consolidation. The biggest problem areas were typically large shear walls, column/slab connections and doorways where the rebar tended to get crowded around the corners. Properly laying structural concrete like that isn't a trivial task, you have to understand what you're doing and why you're doing it. Unfortunately, most companies won't bother with that kind of skilled labor and just use whoever they can pay the lowest wages.

@cremebrulee4759 10 ай бұрын

I have never believed in automatically using the lowest bid. Experience and reputation are also very important.

@catbertz 10 ай бұрын

I'd be a bit nervous living in a multi-story building, wondering if my building secretly doesn't meet code. The regular Joe would never know.

@hopefultraveller1 10 ай бұрын

Jeff, your earlier insights were so well-reasoned that it's no surprise to find them being vindicated by the eventual investigation - thank you, and please keep them coming.

@jeffostroff 10 ай бұрын

Thanks, I'm glad you liked it!

@Darkkfated 10 ай бұрын

I love how this video is basically 20 minutes of Jeff repeatedly saying, "Yep, I was right." I'm here for it.

@kellyname5733 10 ай бұрын

He is a Licensed Engineer, of course he would see the faults in the building.

@Darkkfated 10 ай бұрын

@@kellyname5733 Not only did he "see the faults", he pinpointed the cause mere weeks after it happened based on only a handful of photographs and a couple of grainy cell phone videos. He didn't spend 1000s of hours over 2 years with a hundred people and a massive budget (like the NIST did) and he STILL got everything right, as far as we know right now.

@snaojao8136 10 ай бұрын

To be fair to NIST, they may have known also but have an obligation to rule in or out other causes and find proof for their hypotheses.

@Darkkfated 10 ай бұрын

@@snaojao8136 Yeah, that's their job. They get paid to be ABSOLUTELY SURE (or as close as you can get). I just think it's impressive how much Jeff (apparently) got right with a fraction of the resources and in a matter of weeks.

@electrictroy2010 10 ай бұрын

@Darkkfated NIST is obligated to provide PROOF not just conjecture. That means actually touching the items & measuring them for failure .

@nancylarson7182 10 ай бұрын

Jeff.....you're the best!! I love accountable people who aren't afraid to ask others to rise to their level. That's how we become a better country!!! A better people! Something beyond our own personal gain! 👍

@stevec00ps 10 ай бұрын

Being in the UK and nothing to do with construction, I'm addicted to your videos on this topic and I have no idea why :) Thanks for your updates!

@jeffostroff 10 ай бұрын

Awesome, thank you Steve!

@rottweilertrainingUK 10 ай бұрын

I'm the same! Someone above said that the BBC have a programme coming up covering this which may be interesting, though between Jeff and Josh I think everything is covered 😊

@chrisantoniou4366 10 ай бұрын

From the analysis so far, it seems the investigation should instead of trying to work out why the tower collapsed, try to figure out how it stood up for as long as it did...

@clouddancerss 10 ай бұрын

I am just dumbfounded by this video, it is absolutely criminal. Thank you for another incredible video Jeff, you and Josh Porter are the only guys I trust for accurate information!

@micahpaul20 10 ай бұрын

Damn Jeff you absolutely nailed it on those videos you did. I can’t believe that’s already been 2 years ago. I remember waiting and waiting for your new videos about it to come out. Appreciate those vids and all the others you do brother 👊🏻

@jeffostroff 10 ай бұрын

Thanks Micah, Love doing these videos

@galechicago325 10 ай бұрын

Jeff, you did a phenomenal job in solving so many mysteries right from the start. And you only had access to public evidence: photographs, shaky amateur videos, blueprints, and permit applications for remodels. NIST had all the actual pieces of the structure to pour over for their analysis. Yet their conclusions so closely match what you’ve been showing us all along. It’s always fascinating to watch your videos about this, your knowledge and clearly thought out explanations are exceptional. ⭐️⭐️⭐️⭐️

@jeffostroff 10 ай бұрын

Thanks!

@patricksquires6348 10 ай бұрын

Pool deck was Dead weight plus 40 years of adding sand, pavers, planters, etc. Same for building of adding finishes and tile floors, glass door showers, cabinets, & etc. Also FYI - Why the sister tower added supports so quickly is it was pretty short math to be like… yah…. these columns are not big enough.

@simonscott1121 10 ай бұрын

It's always great when they check the blueprints for code compliance AFTER the building has fallen down.

@laurencebois5119 10 ай бұрын

I see stuff like this all the time in my area, they do sweet FA until someone gets killed. We recently had an apartment block blow up due to a gas leak, killing all residents inside. The awful irony is the fire service had already responded, evacuated and later given the all clear for them to return mere hours before the blast.

@MarkAlbert 10 ай бұрын

Wow, it is quite amazing what you share here with all details. I am glad the NCST and NIST are spending such diligent efforts on unveiling this. Working as a professional handyman for several years now, I have high respect for standard-setting authorities. In my work, I always apply due diligence with regard to local, national and international codes.

@maxmanx1294 10 ай бұрын

That's refreshing. When specs aren't followed, I often hear, "Oh, it will be alright. It was over engineered anyway." That freaks me out because code is bare minimum which doesn't impress me.

@MarkAlbert 9 ай бұрын

@PimpMyDitchWitch Yes, indeed! I am using a wiha torque screwdriver ... and there is a calibration certificate somewhere.

@MikeBMW 10 ай бұрын

Thanks, Jeff, for breaking this down for us in an easy to understand structural analysis. I wish all of us engineers could be as instructive to the everyday individual interested in structural design practices. Well done and, again, thanks! :)

@jeffostroff 10 ай бұрын

Glad it was helpful! thanks Mike!

@kitsapkorner7761 10 ай бұрын

I'm a Structural PE w/ 45 years experience. Jeff is by far the best on failure reporting I have found on YT. Look at how many points he noted that NTSB confirmed. Thank you for translating from Geek to English. Codes have Load Factors applied to Dead Load, Live Load etc that vary individually from 1.0 to 1.7 and in combinations sometimes less as the Design Earthquake is note expected in a Design Snowstorm. On the Capacity side there are factors applied for quality uncertainties etc. Typically, Capacity ends up being around 150% of Demand with nice materials, not nice like Fiberglass, Wood, Composites it can be 10:1. Mobile cranes tip over often because their overturning is at only 115% as construction is only a short period, not 150% structures are supposed to last 50 to 100 years. Live loads vary a lot - offices are designed for 70 PSF for strength (20 PSF partition load snuck in) but testing has found that a column only sees an average of 12 PSF. I've seen framing that should be a pile of rubble that aren't, and things that appear stout that fail. A C/D ratio below 1 should be evacuated NOW, serious temporary if

@nycmermaid3158 10 ай бұрын

I have so appreciated you analysis and commentary since the beginning. As a former PR expert in crisis communication, I’ve had to find the expert to brief me on the issue of the day as the crisis happens. So glad to have found you right away! You are world class, and such a great educator that those of us with no experience have come up to speed rapidly and with authority. Kudos to you!!

@paulnewell927 10 ай бұрын

ALL that time and money spent on the 'investigation' to confirm everything that you identified Jeff. Good job. I agreed with you because i am a retired building certifier in Queensland, Australia. I summed up your early reports wirh my own comment. "Poor design, poor building practice and poor maintenance." Very sad situation for unit owners.

@maxmanx1294 10 ай бұрын

Buyers & residents alike trusted all of those people's decisions with their lives. Its sad & insulting that all involved in the inadequacies didn't respect the importance of their jobs.

@neilkurzman4907 10 ай бұрын

Without an actual investigation, his guess could’ve been just as wrong. You can’t work by guesses you actually have to put in the effort to find out the truth.

@keepitsimple4629 10 ай бұрын

I had an old Supra. No matter how fast you went, the car just seemed to want more. My oldest son bought it, sold it to my youngest son,, then I got it. What a car!!

@jeffostroff 10 ай бұрын

RIP Toyota Supra!

@keepitsimple4629 10 ай бұрын

@@jeffostroff I say it was a car....no it was a hoss!

@billsepmeier8444 10 ай бұрын

I spent three decades in Florida. This is fairly standard shoddy work for the state.

@jeffostroff 10 ай бұрын

I have seen bad construction practices since I was a kid in the 1970s

@wendys7285 10 ай бұрын

@jeffostroff thank you for this!!

@kennethjacobs2151 10 ай бұрын

Love your views on all topics. Thanks Jeff. I lived and worked in the field of construction for five years in Florida, and know how hot the temperatures get down there especially during the day. The closeness of the re-steel that you show may be the problem with it not being tied together properly. If the wire was spun to tight, it is very easily broken loose as the "vibrator is settling it in the form. This is a problem in many different temperature extremes. Especially in Florida where the distribution of the concrete is very slow and the slump was less than desirable for the pour. Most contractors don't have qualified employees that understand that vibrating concrete has to be done in lifts. I am not blaming anyone for fault, but I've seen this over my 40+ years in the business.

@jeffostroff 10 ай бұрын

Yes I never thought of that. Did they have these winders in 1980? Milwaukee just introduced a good one last year on their Pipeline announcement

@kitsapkorner7761 10 ай бұрын

Lap splices have the bars touching to assist the worker, ACI allows contact to 6" apart to be effective with say slab bars. Outside of splices it is around 3x the rock size to be sure there is good flow. 1x the rock size is the worst because air bubbles replace concrete that should be there. In an 8" slab having the bars further from the face by 1 inch reduces the bending strength by 5.5/6.5 or 85%, killing the Factor of Safety.

@kennethjacobs2151 10 ай бұрын

We had them in the mid 80's in the Detroit area, but I don't think that they were approved right away.@@jeffostroff

@somethingelsehere8089 10 ай бұрын

@@kitsapkorner7761 As a layperson this is something I always wondered about. I live in the salt belt and always wondered why they didn't just embed the rebar a little deeper to protect it better from corrosion.

@kitsapkorner7761 10 ай бұрын

@@somethingelsehere8089 They do change the concrete cover of rebar - indoors dry is 3/4", 1.5" to weather, 3" to casting against earth. In seawater it is 3" + either galvanized or epoxy coated. But increasing cover makes the slab or beam deeper for the same strength, thus heavier making the beams all the bigger. An 8" slab with 3/4" cover, needs to be 9.5" with 1.5" cover. Suddenly the slab costs 20% more.

@sparty94 10 ай бұрын

you and josh at building integrity have both done a great job on this topic. great analysis without getting out over your skiis.

@Khanfuzed1 10 ай бұрын

Great recap man. You made this great. Im glad there’s seemingly obvious things that were wrong. This is such a quality education

@jeffostroff 10 ай бұрын

Thanks, there was a lot of info to curate for this one

@danr9584 10 ай бұрын

This is the first time I had heard that there was so much sand. I wonder if the deck was already sagging, and they added extra sand just to even out the surface.

@Khanfuzed1 10 ай бұрын

@@danr9584 i bet that’s a probability. Instead of fixing just paint the pig

@ZiggyTheHamster 10 ай бұрын

The DVR was in the standing part of the building. It could have been removed by anyone with the skills and dexterity of a child or better at any point prior to the implosion of that building. The fire panel at least had some screws holding it in, but the fire panel guy offered to come by and remove it for evidence. At the very least, I hope that NIST's findings/recommendations after this is all over is that there are procedures to identify the location and take custody of the fire panels and security camera DVRs immediately after an incident like this.

@ZiggyTheHamster 10 ай бұрын

Also I would love to know ... is there some Jeff/Josh feud I'm unaware of, or is there a third YTer who I have no clue exists? Both Jeff and Josh like to talk about some other person and I have no clue whether they're talking about one another or if they're talking about the same third person and it's driving me crazy.

@aralornwolf3140 10 ай бұрын

@@ZiggyTheHamster, Well... considering Jeff used Josh's video as a key part of this video, I am going to assume he doesn't consider Josh to not know anything, lol. So, that leaves "suspect(s) unknown"...

@gorak9000 10 ай бұрын

@@ZiggyTheHamster I think there's some other guy - I seem to remember looking for it when he was mentioning some other YT'er in the videos a long time ago, and the guy's theories were out to lunch. It's not Jeff and Josh feuding - it's some other guy entirely

@maxmanx1294 10 ай бұрын

@@ZiggyTheHamsterI doubt it. Josh is cool & comes off as mature, intelligent, and respectful. It must be someone else.

@kellyname5733 10 ай бұрын

@@ZiggyTheHamsterThere was some other man that was making vids at the time the CTS failed. Im trying to remember his name but I cant. He was kinda negative to Josh and Jeff right from the start.

@LakeNipissing 10 ай бұрын

25:19 . . . If you recall, the column with #28 painted on it remained more or less intact (as seen in the photo). The column between 27 and 28 disappeared, and there didn't seem to be any trace of it or the rebar at the basement floor, when you took photos of this when you were at the site once much of the cleanup was done.

@Davemak4944 10 ай бұрын

Thanks for keeping us in the loop on the continuing new info!

@jeffostroff 10 ай бұрын

You bet!

@maryg4551 10 ай бұрын

I've been watching your videos since the initial collapse and looks like you were spot on. Thank you for your very informative and well-explained videos.

@melaneymattson3733 10 ай бұрын

I love all your analysis videos. I'm surprised that that article in the paper 3 days before the collapse didn't alert them to evacuate the residents! Thanks Jeff, Melaney from SoCal

@comaspace3 10 ай бұрын

I believe the article came out after the collapse. The photos were taken by an inspector 3 days before. Still so many red flags. It's a shame that people didn't get out before this happened.

@lukehess2360 10 ай бұрын

The photo was taken 3 days prior, the article came out after the collapse.

@electrictroy2010 10 ай бұрын

@melaneymattson3733 LOL the residents knew about potential collapse for YEARS but consistently voted “no” at condo maintenance meetings. They flatout refused to repair their home building as it rotted away. I honestly think they got what they asked for (no maintenance & collapse) .

@lukehess2360 10 ай бұрын

@@electrictroy2010 cite your source, please. Fun fact: this has a condo board, and the board had deferred maintenance for years, NOT the residents. In fact, just prior to the collapse is when they informed residents of a massive repair bill and tried to levy $10,000+ from each condo owner all at once, which is of course preposterous.

@lyndavandusen1540 10 ай бұрын

Thanks for keeping us updated. Always look forward to your videos. You always make the information easy to understand.

@ReflectRx4u9809 10 ай бұрын

Thanks so much Jeff. Watching your coverage and repeatedly checking for new videos was my intro to KZfaq. So thanks for getting to the why, and doing it well!!

@kathym5307 10 ай бұрын

Thanks for sharing the update. Great job!

@erichaynes7502 10 ай бұрын

Great update as always Jeff! South Florida, anyone remember Hurricane Andrew? all those houses flying apart because they were constructed so fast/cheap they didn't even hammer nails into the beams.

@maxmanx1294 10 ай бұрын

Gable sheathing wasn't nailed to framing or was merely tacked in place. People don't care or don't think about their work killing people. Everyone had to know sheathing must be fastened (among other things). I'm glad the building code was overhauled mandating that roofs are securely fastened to the wall framing. Many roofs simply folded over on the homes.

@VedaSay 10 ай бұрын

Love your narration! Awesome effort with the channel.

@Melaniexb1 10 ай бұрын

Thank you! That is a wonderful presentation you shared with us! I have been watching the Champagne Tours w your videos ! So again thank you!

@ws_m 10 ай бұрын

Thanks again for updating us, Jeff. I haven't seen this story covered as well or as thoroughly anywhere else!

@jeffostroff 10 ай бұрын

My pleasure!

@jatdesign4495 10 ай бұрын

This reminds me the Hyatt Kansas City 1980 incident, where design changes weren’t caught or flagged but then look at the citi group Tower of New York, where an engineering student saw a very huge problem and warned of it just in time before it was a disaster. Sometimes you have to get a better set of eyes. I work around architects and engineers and I too myself look and look to assure nothing is noted improperly. It’s scary honestly.

@GunnarKennedy 10 ай бұрын

My Spidey sense keeps steering me back to this kind of fundamental misrepresentation of as built vs planned shenanigans is part of the weirdness for the WTC pair. That period of time in construction in the States was very fly by night.

@gregorycerven3484 10 ай бұрын

Reminds me of the one SE that I used to work with - 6 bolts at 3" spacing is very different than 3 bolts at 6" spacing.

@electrictroy2010 10 ай бұрын

@jatdesign4495 BZZZ we studied the 1980 in engineer college. THE DESIGN was 100% correct. But the construction company did not follow the blueprints. “Oh we’ll simplify it” said the construction foreman. Now you know… the rest of the story.

@dawnvanderende7584 10 ай бұрын

Thanks Jeff for all the great analysis and updates!! I have binge watched all the Champlain Tower videos!😊👍

@cmichellesummers 10 ай бұрын

Thanks for keeping US up to date on how the collapse of the towers was allowed to occur. Your analysis is well thought out and obviously accurate. The nerds thank you!

@craigsymington5401 3 ай бұрын

Well presented again Jeff. Its been said "the wrongest you can be is dead", but enginering fails make others dead!

@jeffostroff 3 ай бұрын

Very true!

@theraptorsnest5891 10 ай бұрын

Love your videos Jeff. I found your channel during the Davenport, IA apt. building collapse and have binged watched all your vids. You're coverage of the Titan sub debacle was really good as is your coverage of the condo collapse. Keep the vids coming!

@K1OIK 10 ай бұрын

WTF are vids

@electrictroy2010 10 ай бұрын

@K1OIK shorthand for videos.

@Zalley 10 ай бұрын

Another great video breaking down the findings for us! Thanks- you do a great job. 👏👏👏👍

@yesprincessjessie 10 ай бұрын

Thanks for this well put together update!! Love all your videos Jeff!!

@NAVYSEABEE 10 ай бұрын

I wouldn't want to be one of those condo owners at Champlain Towers North!

@jeffostroff 10 ай бұрын

They don't seem to be worried

@bascomnextion5639 10 ай бұрын

Ignorance is bliss! After this though would the authorities be demanding temporary props be installed or deeming the building too dangerous to live in? @@jeffostroff

@rayray11939 10 ай бұрын

Don't think North had 9 inches of sand and palm trees but they still could be at half the required capacity as built.

@paulrasmussen8953 10 ай бұрын

@jeffostroff well i think their board spend the fee money smarter. Instead all the fancy remodels they woeked on issues

@motorTranz 10 ай бұрын

Great job Jeff! Thank you for this update!

@jeffostroff 10 ай бұрын

Thanks for watching!

@jonclassical2024 10 ай бұрын

Great Report Jeff and you were very on track with all of this...Cheers to Mr. Toolman!!!!

@vernaselander8276 10 ай бұрын

Good job Jeff!!!! Have you seen the animation version of the collapse? It’s basically everything you have said in animation. 🇺🇸👌

@jeffostroff 10 ай бұрын

Yes there are numerous animations

@davidsimmons586 10 ай бұрын

thank you for the update.

@paulazemeckis7835 10 ай бұрын

Thank you Jeff! With love from sunny and warm St. Petersburg, FL.

@blitzmom2674 10 ай бұрын

I really enjoy your videos, on this subject, the millennium tower in SF and the Titan submersible. I'm so glad you gave us this update on Champlain South, and I'd be interested in what, based on this, is going to happen with Champlain North. Also please keep us updated with the Millennium Tower in SF and the Titan.

@K1OIK 10 ай бұрын

SF?

@blitzmom2674 10 ай бұрын

@@K1OIK San Francisco. This is the tower that is tilting and sinking

@K1OIK 10 ай бұрын

@@blitzmom2674 What did you do with the time you saved not typing an rancisco.?

@glennsmusicchannel 10 ай бұрын

Well done, Jeff! Can't wait for the next one.

@karenwhitley7211 10 ай бұрын

Just wow!!! You were spot on Jeff in your analysis. Thanks for all you do.. love Titan videos also.

@jeffostroff 10 ай бұрын

Much appreciated!

@stuartegner4032 10 ай бұрын

Fantastic stuff, love your video's...

@compactc9 10 ай бұрын

Everything I've watched where you talked about this, you backed up your ideas well enough that it just made sense to me, so I'm not terribly surprised that NIST's findings are going in the same direction.

@lookforitcx 10 ай бұрын

Always a treat to see you've uploaded new videos, especially if it's on CTS. Thanks for the great update, especially the part on those security cameras. Let's hope those harddrives give us some more mind-blowing videos and insights. The suspense is killing me!

@K1OIK 10 ай бұрын

cts?

@electrictroy2010 10 ай бұрын

Judas Priest… if you don’t know what CTS is, then you cannot read the title of the dam video

@K1OIK 10 ай бұрын

@@electrictroy2010 dam? What does a dam have to do with anything?

@brandigirl747 10 ай бұрын

Thanks Jeff, We really appreciate you!!

@jeffostroff 10 ай бұрын

My pleasure Brandi!

@KelseyDunlevy 10 ай бұрын

Thank you for your videos. I know nothing about structural engineering, and every time I watch one of your vids, I leave more informed.

@jeffostroff 10 ай бұрын

Thank you kelsey glad to help

@Angelenowithacamera 10 ай бұрын

Yep you seemed to know what you were talking about all these years! I am sooooo grateful there are finally some answers! Please keep them coming! I am excited.

@rogerwilks7512 10 ай бұрын

Another fantastic informative video, thank you for continuing with this story👍

@tigq1430 10 ай бұрын

Your video popped up randomly. I stayed, watched and listened to it all.👍

@jeffostroff 10 ай бұрын

Awesome, thanks for stopping by!

@imaner76 10 ай бұрын

Thank you. There are very few who can be trusted for not only an initial opinion, but also a detailed post report explanation. Blancolirio is another that comes to mind on the aviation side of things. You deserve the success of this channel, you had very few subscribers when the tower collapsed. Well done you.

@markn8866 10 ай бұрын

Once again, thanks for sharing your insights and research - much appreciated!!

@CB-vt4ic 10 ай бұрын

Thank you for your continued analysis of this tragedy

@Martins_Musings 10 ай бұрын

You are the best Jeff! Keep it up!

@rickh6963 10 ай бұрын

Very good video Jeff, very good!

@mariafusco7899 10 ай бұрын

Thank you, Jeff, for following through on this. So glad you are being vindicated! I do appreciate your experience and wisdom.

@DallasNatureLover 10 ай бұрын

Good point about the laborers. They go out to do a job and their supervisors want it done as quickly as possible. Not surprised that new pavers were laid over old pavers as that’s faster and easier than removing the original pavers.

@gregorycerven3484 10 ай бұрын

I'm sure it was more the HOA / condo board trying to cheap out on the reno. They probably had an idea to refresh the pool deck and went with the cheapest option someone presented to them, which was throw some sand over the old stuff and put new pavers down. I'm sure no one thought about doing a structural analysis to verify the pool deck could hold the weight. Most tile guys / paver guys would think "well it's holding the weight of what's there, what's a little more going to hurt".

@maxmanx1294 10 ай бұрын

@@gregorycerven3484Right! And I've heard things like that said most of my life. Sometimes I explain, but they don't care.

@MoneyManHolmes 10 ай бұрын

They probably put 9 inches of sand in some areas because it was already sagging, breaking and popping up the original tiles. Maybe by several inches.

@mikelemoine4267 10 ай бұрын

The columns when built had only 50% of the capacity that they should have had, and that was before they added those heavy planters and tiles, and before decades of water damage had eaten away at the rebar. If anything, it shows how much redundancy the code provides for, but only if the builder follows the code. It's angering that so many people were either corrupt, incompetent or lazy (the old drive by structural inspections) and families had to suffer such tragedy because of it.

@billj5645 10 ай бұрын

It's not the COLUMN that has reduced capacity, it is the slab where it connects to the column. The columns had much more capacity than necessary which is why they still tend to be intact after the failure and after the implosions.

@cyphi474 10 ай бұрын

Capacity was in limits when condo was build. That added weight, extra concerete, sand and pavement, was added later making it down to just 50%. Its hard to believe they didnt consult it with engineer who would make maths and told them it simply too much. There was no reserve to add extra weight.

@billj5645 10 ай бұрын

@@cyphi474 I assume you have done your own calculations to back this up and you are willing to share them? I have done my own calculations and they gave a different result.

@mikelemoine4267 10 ай бұрын

@@billj5645 Agreed, really meant the assembly itself which included the columns and the deck/slab connection. I do wonder if the columns were thicker if they might have been able to survive the punch through better. Probably not, but it makes me curious.

@mikelemoine4267 10 ай бұрын

@@cyphi474 I may have mis-understood but I thought Jeff cited NIST claiming that they were under code limits at the time of construction? But yes I agree that they should have consulted with an engineer before loading the place up with pavers, granite and tons (literally) of other materials. I saw a prior video where Jeff pointed out tile on the balconies, which is also against code due to moisture retention. Lots of bad decisions, although most people have no concept of concrete being as permeable and vulnerable to moisture intrusion as it is.

@CarolReidCA 10 ай бұрын

This is scary. Who let them do this? From what I recall, the original contractor passed some time ago. I hope they check out the other buildings in the area. Couldn't get me to live in any high-rise. Thank you, Jeff. Very interesting. Have you ever thought of teaching basic engineering classes here? Everyone interested in building should have knowledge about construction and code minimums, as well as best building practices and best ways to build buildings for longevity, strength, and durability.

@jeanetteshawredden5643 10 ай бұрын

The developer who was a crook & Jewish man from ?New York, is dead so they couldn't sue him. died recently

@Koroodetto 9 ай бұрын

Jeff, you are a very smart guy and know your stuff. I have learnt so much from you and I know nothing about engineering. 😊

@jeffostroff 9 ай бұрын

Awesome, thank you!

@nancydarling4918 10 ай бұрын

Excellent video. Thanks.

@BBRocker75 Ай бұрын

Mr Jeff. I checked many of your vids about this case. U NEED CONDENSE ALL THIS INFO in a GOOD LONG VID OR A VID SERIES talking about signs of danger, warnings and final tought about all the things u discovered and analyzed. Not only to show engineers what will happen in the future with their buildings, but to SHOW ANY OWNER ABOUT KEEP ON EYE IN THEIR BUILDINGS STRUCTURES AND ANY MAINTENANCE PROCEDURE. It is amazing this tragedy wasn't a big structure suddenly fail, it was little mistakes after little mistakes made it year by year for decades. From building structure designs to apartment renewals all those things were stacking and then the tragedy happened.

@jeffostroff Ай бұрын

yes, when nist completes the final root cause analysis, I will do a complete video

@skwervin1 10 ай бұрын

Back in 1993 I was building my first house and we were about to have the concrete poured and the rebar etc has to be inspected on the day of the pour and during the start of the pour (so they don't get it ticked off, then removed the rebar and pour it without any rebar in the slab - some dodgy builders got caught doing that) and I was there as the owner and being a bit of a sticky beak! One of the builders took the time to explain to me why there were all these little hat things holding up the rods. I used to drop by at least once a week during the build and drop off a few 6 packs of ice cold soft drinks, beer and some mixed (jack and coke for example) in the afternoon particularly during summer. It gets hot here in Australia and I know the guys appreciated a cold drink or two during work hours. I spoke with the guy in charge and they got the soft drinks during work hours and the beers etc to take home - I even asked them what they preferred. I worked in the food industry at the time and would also drop by with cakes, slices etc for them eat on site or take home. When finished our house was spotless, no cracking aparting from a tiny bit of settling which is normal in our area, the grounds were spotless, they left us a heap of unused bricks and tiles neatly stacked in the garage and roof tiles as well instead of dumping them or selling them on. We were able to make a matching letterbox from the bricks which was cool and they even left some extra phone cable etc as well. The builder also gave us some tips about where NOT to hang things or similar and showed us on the plans where the best places to put hooks for planters etc were. Showing your builder and his guys a little TLC can go a long way to saving you money in the long run. Cost us maybe $200 for beers etc back then and we have the house for 20 years.

@user-pf5xq3lq8i 10 ай бұрын

Is it possible to scan the columns to see where the rebar is inside, or if it's there at all? Might be useful for those living in CTNorth.

@rocketrider1405 10 ай бұрын

Jeff, you’ve really been an essential knowledge source for people trying to learn about this and other events (including the sub Titan). Thanks! ❤

@user-pe4xf6hd5q 10 ай бұрын

Jeff…you’re good! Many thanks

@hayleyqueen987 9 ай бұрын

Hey Jeff, love your work 👍. I think the smoking gun is the “white vehicle” sitting in your picture next to 13.1. The engineer hasn’t allowed for, not only the weight of the planters, but also the “Live” loads of the cars next to that area. This combined with the extra weight of the sand, tiles, palm trees, heavy machinery, and the offset and longer span from 13.1 to the columns to the south (to allow the car park level to work better😐) all combined to the calapse of the deck and then pull the building with it 😕.

@randalrobinson3424 10 ай бұрын

I'm not an expert in design of reinforced concrete structures, but I know that corrosion of rebar always occurs to some extent unless an effective anodic protection system is used (to my knowledge this is only done in concrete bridges). Since the rust has a greater volume than the original steel, it can cause the concrete to spall off, weakening the structure. I assume this is why residential building codes now require rebar in footings be covered by 3" of concrete instead of 2" as stated in older codes. So, I am puzzled by the drawing requirement here that the deck rebar be covered by only 3/4"(?). I understand that this would make the original construction stronger, but it seems susceptible to degradation over time

@ZiggyTheHamster 10 ай бұрын

This got covered in like one sentence at some point, and perhaps Jeff's experience working with trades can elucidate it some more, but there's the structural slab, and then they added a "topping" layer, which I think resulted in the finished depth to rebar being 2-3". I'm not sure why the topping layer is a separate pour, but I think it's for waterproofing since it's a wet area - that's where Jeff probably has experience and can explain it.

@clee8768 10 ай бұрын

3/4" cover to rebar is common in elevated slabs. If they are exterior, I would provide more cover or use galvanized rebar to add extra protection. Footings are 3" for bottom bars cast against dirt to account for uneven grading. The sides of footings are 3" unless you form the footings in which case it can be reduced to 2".

@electrictroy2010 10 ай бұрын

Old 1977 standards didn’t have rebar as deep. Just a guess

@clee8768 10 ай бұрын

I just checked a copy of ACI 318-71 which would have specified these requirements in the early seventies. All the requirements are the same as we use today.@@electrictroy2010

@Paulburnard 10 ай бұрын

Thanks Jeff. Another great video.

@rondadams 10 ай бұрын

Jeff, your videos are amazing, informative and have taught me SO much. Thank you! The failures in this building are shocking, horrific and criminal. It’s a shame none of the original criminals who built this are alive to be punished. Hopefully the lessons learned here can be applied in all current and future buildings.

@ap70621 10 ай бұрын

You and Josh are my go-to sources on this topic.

@jeffostroff 10 ай бұрын

Yes he has a great channel too!

@nothanksguy 10 ай бұрын

I have been following your videos along with other engineer's channels about this disaster. Thank you for spreading this info in a way that is understandable to the common folks. NIST analysis is great as well, because it is very important for the base of information to be slowly, agonizingly, and throughly vetted and refined.

@amcdonal86VT 10 ай бұрын

I feel like I should be getting CEUs for watching your videos

@jeffostroff 10 ай бұрын

LOL I will start issuing CEUs

@CopperValor 10 ай бұрын

I can't believe I have been watching you for 2 years! Nuts! Don't let that guy bother you I have no interest in engineering yet I watch all your engineering videos! Enough said.

@maxmanx1294 10 ай бұрын

Calling him "Tool Boy" 😂 & rolling my eyes.

@mariemccann5895 10 ай бұрын

Superb work Jeff, virtually everything you have said has turned out to be correct through excellent analysis.

@donnarice9965 10 ай бұрын

Good job, Jeff!! Your intel throughout all of this has been spot on!!

@jeffostroff 10 ай бұрын

Thank you so much Donna!

@adamjudis 10 ай бұрын

Great analysis, I knew you were spot on from the beginning.

@nononsenseBennett 10 ай бұрын

Thanks for keeping on top of this story.

@annem7806 10 ай бұрын

Great call👍👍

@snaojao8136 10 ай бұрын

Another home run video, Jeff. Thank you.

@jimgraham6722 10 ай бұрын

Thanks, very interesting. I have experimented with setting concrete pavers on fire proof foam. It works amazingly well.

@dminner 10 ай бұрын

Best one stop shop on YT!

@nerolicompletecreme 10 ай бұрын

Keep ‘em comming can’t wait to watch the south towers video ❤❤❤

@jeffostroff 10 ай бұрын

Thanks glad you come back for more

@robertfarrimond3369 10 ай бұрын

As a retired construction worker, I can give you the perspective of one. First of all, when the boss hands you a set of plans with a stamp of approval on it from the building department, we have to have a certain amount of faith that the people with the slide rulers did their job, before we do ours. Just from what I've seen in the evaluations in this video, I'm struck by questions of; was it built per plan ( never mind the later stuff). If it's per plan, how did they get the plans approved with the deficiencies built in? What ever was done later with the coatings, sand, pavers, and planters was probably farmed out by the HOA without permits or planning approval.(to save money)

@jeffostroff 10 ай бұрын

It looks like it was mostly built to plan, but the plans were underdesigned.

@kate2create738 10 ай бұрын

It’s interesting how one of your most talked about photos was the Ford stuck in the basement that resulted in being crushed by the final demolition of the tower. There was a tragedy of multiple lives forever lost, people lost finically security, and another tower potentially could be faced with a similar outcome, but that Supra manages to be brought up. The priorities some people have been interesting, especially when looking historically of other tragic events of what catches people’s eyes, such as when talking about the Titanic most people are mainly focused on the 1st class passengers perspective, or the beauty the ship had. Just an interesting side note you shared.

@davef.2329 10 ай бұрын

Thanks, Jeff.

@KJPartyof6 10 ай бұрын

Jeff, I love you videos & insight. With so many empty commercial buildings (WFH bring the new norm), there is talk about converting them to affordable housing. I recall in the Champlain series you taking about adding weight (granite, etc) that compromises the building. This may be a boom on the horizon that will lead to an increase in collapse in 10 years! It's love to hear your perspective!