Surfside Condo Collapse: New Video Proves Garage Column Fell

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Күн бұрын

Your host Jeff Ostroff presents a brand new exclusive video which he shot at the Champlain Towers North condominium in Surfside FL, to duplicate the now famous tourist video of the debris pile in the garage of the Champlain Towers South condominium 5 minutes before the building collapsed on June 24, 2021, at 1:22 AM.
In this video we examine the evidence by using the same external street-view appearance of the Champlain Towers North condo, to show exactly where the columns should appear in the Miami condo collapse building garage, as they share the same garage floor plan, ramp design, and dimensions for the most part. This then helps us narrow down which column or columns had collapsed first when the pool deck collapsed at 1:17 AM and will help us determine from there how a missing column could have caused an entire condo to collapse.
We study closely column 11.1 to determine if it was s indeed the first column to fall before the condo collapsed. Some people dispute whether column M11.1 was missing before the collapse.
Condo collapse Timeline Spreadsheet: CTS Collapse Witness Statements
docs.google.com/spreadsheets/...
⛔⛔ Official Surfside Support Pages, only send aid to vetted support sites! There are scams related to disasters, you should avoid unvetted fundraisers.
⛔ Support Surfside: supportsurfside.org/
⛔ GoFundMe Official Vetted Pages for Donations to Surfside collapse victims: www.gofundme.com/c/act/surfsi...
The Champlain Towers South condo complex collapse was located at 8777 Collins Ave. in Surfside, FL, which is just north of Miami beach.
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⏱ Table of Contents Surfside Condo Collapse (Click on timestamps to jump to a chapter) ⏱
0:00 Introduction to duplicating tourist video of pool deck collapse
1:40 Using Champlain Towers North Parking Garage as a model for collapsed condo
3:13 New exclusive video duplicates condo collapse garage view during daylight
3:50 View into condo garage showing all columns with gate up
4:40 Determining where the rubble pile is, on-ramp? Under building? Under pool deck?
7:05 Collapsed condo garage columns superimposed over the new street video
9:45 What caused the garage column to fail? Evidence from previous garage video
11:00 Overhead condo collapse site photos show the relationship of failed columns
12:20 Closeups of current cleared condo collapse site showing failed columns, M11.1
13:00 Determine real location of pool deck collapse rubble pile in the garage
14:55 Examing ceiling support beam between columns M10 and M11.1
17:10 Ceiling damage in the area of first garage column to collapse in the condo

Пікірлер: 1 500

@galechicago325 2 жыл бұрын

Jeff, you are genius, coming up with the idea of photographing the NORTH tower parking garage from the exact same spot to match the tourist video. In daylight! Your videos are even more riveting as time passes. Thank you for such clear, well presented ideas.

@christopherwasko5948 2 жыл бұрын

You must live in or near Miami. I can't say I really ever follow most of your content, but everytime you talk about this engineering stuff, I'm glued to my seat. You should do this more. I've really enjoyed learning more about this. I'm a Naples resident, so it doesn't hit that far from home. These are very quality videos you put out and it should be appreciated. I just wanted to say thank you for doing all this hard work.

@jeffostroff 2 жыл бұрын

Thank you for watching Christopher! Yes it's a 45-minute ride from my house when I go down there, 45 back, and usually hours on the street when I get there.

@Italian69Boi 2 жыл бұрын

@@jeffostroff cool u are from Boston. I live in Quincy 😊

@pompom11 2 жыл бұрын

@@Italian69Boi hi, I pahk my cah in Danvers. 🦞

@santarosaamandaarmas2561 2 жыл бұрын

Sad we are in Miami and me totally in shock i cant go anyone building totally panic for sure very serious.

@johnbroadwell2603 2 жыл бұрын

I appreciate these videos as well...

@ap70621 2 жыл бұрын

I'm pretty much 100% sure that large object on the garage floor is a planter from the pool deck.

@TheGhettoDebutante 2 жыл бұрын

Yeah me too...now thats the right size for the perspective

@jpgommers7859 2 жыл бұрын

It also explains the sinkhole that was witnessed

@FelonyVideos 2 жыл бұрын

Sure looks like it to me, too.

@AtlantaTerry 2 жыл бұрын

@@jpgommers7859 "widnes"? You may want to edit that line.

@Carolevw 2 жыл бұрын

@@jpgommers7859 witnessed?

@jeffreylewis145 2 жыл бұрын

That back and forth video is fantastic. It was a really great idea.

@jeffostroff 2 жыл бұрын

Thanks so much Jeffrey!

@erichaynes7502 2 жыл бұрын

14:55 wow, it's amazing it does look like the planter fell straight down when the pool deck collapsed!

@jeffostroff 2 жыл бұрын

That's my story and I'm sticking to it!

@DARWINZOO 2 жыл бұрын

A cat knocked the planter over and escaped. I'm telling you whoever had a Go Pro on a cat has the Entire Thing!!! (Except cats sleep around 16 hours a day)

@PatLyoutubepage 2 жыл бұрын

@@DARWINZOO lol must be some kind of superpower cat

@DARWINZOO 2 жыл бұрын

@@PatLyoutubepage I have documented the genetic line of my Egyptian Goddess cat, The Cat Bastet. She assures me that this is possible and that at no point would the failure of human empathy intrude

@Darkkfated 2 жыл бұрын

Since the columns were so thin, EVERYTHING fell straight down in an incredibly clean punching shear. Unfortunately, you NEVER want to see a clean punching shear, it means shit just got REAL bad. Entire Parking Garages have been gutted with much messier punching shears that left big caps on all the columns; there is NONE of that going on here. I have to agree 100% with Jeff. Once 11.1 came down, it took that weird warped beam with it, which weakened or toppled M10, and from there it was a domino effect of punching shears and failing columns as more and more weight starting pressing down on the remaining, already-borderline-overloaded columns, until the whole central building started to pancake as seen in the Security Cam video from the adjacent condo.

@Linda-pg3so 2 жыл бұрын

Your assessment I think is spot on. Thanks for the many hours of work you put into this. Much appreciated.

@jeffostroff 2 жыл бұрын

Glad to help out Linda, and thanks for watching

@cathy8070 2 жыл бұрын

This video is SUPERB. The shaded in columns and contrasting coloured cursors made it very easy to see what you were saying. And your dedication to detail and accuracy is why I so look forward to your videos regarding info on condo collapse. I also agree with your version of events.

@jeffostroff 2 жыл бұрын

Thank you so much Cathy!

@cathy8070 2 жыл бұрын

@@jeffostroff …..no, thank you 😊

@Penguin_of_Death 2 жыл бұрын

@@cathy8070 I think you mean SUPERB!

@cathy8070 2 жыл бұрын

@@Penguin_of_Death thank you. I don’t always notice when my damn phone makes it’s own changes. And I’m sticking to that reasoning lol 😂

@historylover13 2 жыл бұрын

Thank you for your thorough and in-depth analysis. I've watched all your videos on the Surfside condo collapse and I've learned a lot about structural engineering, which I never thought I'd be interested in. It's forensic detective work and I think you're spot on. I hope you can make the official investigators aware of your video series as I think it will be of great assistance to the team.

@ScotFarthing 2 жыл бұрын

Nailed it…. Jeff you are really good. From the moment I saw the still in the video 5 min before the collapse I said there is a planter on the floor. Keep up the good work. The City should be paying you for all this work. Well one can dream anyway..

@johnbergstrom2931 2 жыл бұрын

KZfaq is paying him. He gets hundreds of thousands of views...

@AtlantaTerry 2 жыл бұрын

@@johnbergstrom2931 How much per view? $1? More?

@TheGhettoDebutante 2 жыл бұрын

Agree. I've really learned a lot from your study of this event. That beam isn't carrying the weight down onto the pillar at space 28. As upgrades continued over the years, and unsafe work practices were left unchecked this weakened section was bound to fail.

@jeffostroff 2 жыл бұрын

It probably is carrying the load because the concrete is all formed and poured as one unit. But were the rebar and connections made strong enough?

@metatechnologist 2 жыл бұрын

No kidding. As Jeff pointed out they drove heavy equipment on it then it looks like they drilled into it weakening it further. Not to mention the waterlogged sand pavers and heavy planter.. What's interesting is that this failure was not anticipated i.e. it appears they never asked the question "how could this building fall down".

@kevinjgillespie 2 жыл бұрын

I just finished watching, Jeff, excellent assessment, as have been all your videos. I think you have done the best analysis of this tragedy available to the general public. Thank you for all the work you have done, great job. I also think you are right on target where this collapse began, column 27/M11.1 and that's right below where they did the exploratory work a few years back and had yet to repair it, (caution sign area). I think the contractor was focusing on what was clearly a very concerning area of the structure. And yes, the cross beam that runs between 27/M9.1 and M11.1 is a huge part of this, when M11.1 collapsed it may have brought that beam with it, which may have condemned the residential side of the structure. Thanks again, Jeff, much appreciated!

@jeffostroff 2 жыл бұрын

⛔⛔ Official Surfside Support Pages, only send aid to vetted support sites! There are scams related to disasters, you should avoid unvetted fundraisers. ⛔ Support Surfside: supportsurfside.org/ ⛔ GoFundMe Official Vetted Pages for Donations to Surfside collapse victims: www.gofundme.com/c/act/surfside-condo-collapse-fundraisers

@josevillanueva1398 2 жыл бұрын

You pointed out a column shearing instead of on top... I wonder if the twin building have that same "possible irregularity". Any other difderences in the twin building?

@ThisJury2023 2 жыл бұрын

Can you tell if beam in question at south building is constructed the same in north building (not on top of column?)

@josevillanueva1398 2 жыл бұрын

Sometimes silence answers the question itself 😱

@WhenImBackInChicago 2 жыл бұрын

Thank you for reminding folks to use only vetted-charity sites, Jeff. 💯

@fredashay 2 жыл бұрын

You're doing an incredibly thorough job analyzing this. Ignore the trolls...

@N1RKW 2 жыл бұрын

Such a incredibly sad and utterly preventable disaster. Jeff, your analysis is spot on, in my opinion. Your video comparison of the two buildings made it very clear to me that the "11.1" column is missing in the tourist video (might be among the rubble). I'm amazed that the building stood for as long as it did after that. Very sad indeed.

@ScotFarthing 2 жыл бұрын

I agree with all you said except “preventable” As Jeff said the inspection of stuff prior to the collapse was not a going to fail conclusion. It’s going to end up being a whole bag of items that together formed the perfect storm. And I whole heartedly agree that the whole mess is very sad..

@N1RKW 2 жыл бұрын

@@ScotFarthing - A lifetime of proper building maintenance might have prevented this, in my opinion.

@ScotFarthing 2 жыл бұрын

@@N1RKW Yes I agree, but I think the failure was due to a lot more such as adding the planters, the pavers, and improper drainage on the pavers. And I don’t like that beam being mounted to the side of the posts. The beam almost seems like an after thought. Maybe Jeff could comment about the beam layout in original plans. Thanks for the comment..

@jeffostroff 2 жыл бұрын

If only they designe the pool deck to be isolated by a joint or space, maybe the is might not have happened.

@Mikefngarage 2 жыл бұрын

WHY was the building not condemned......THey are lucky Im not an engineer I would have red tagged it. OK everyone out.....

@mvedda65 2 жыл бұрын

Thanks Jeff - excellent analysis. It sure looks like M11.1 was crushed from the initial collapse. It explains why the rebar was flattened as well. Keep up the great work!

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@dayelvisdied 2 жыл бұрын

Great diagnosis, as usual! The water-saturated bowing beam and the saturated concrete above just sheered-downwards. Nothing to hold the deck up! The corrugated plastic roofing they used to direct water away from that parking space should have been a red flag to any engineer, not to mention condo officials. (That cut-out on top of the deck next to the planter may have been "funneling" water to that part of the deck since the waterproofing material was gone. That was a point of saturation BEFORE the cut-out and with the many Florida rains per week AFTER the cut-out was done, there was water saturation at least ten-times the amount previous). ...Hopefully, the Surfside tragedy is making experts and everyday people to take a second-look at buildings they encounter everyday and see what water and improper column construction can do to a building and precious lives therein.

@jeffostroff 2 жыл бұрын

All great points Edward

@KayInMaine 2 жыл бұрын

Yes, those tiles cut out seems to be a big catalyst here. Apparently it's been "naked" (no tiles) for 2 years???????

@MajorCaliber 2 жыл бұрын

Never underestimate the SF-SF (South Florida Slacker Factor)... esp. in the 1974-1994 era.

@trevjr 2 жыл бұрын

Such great comments. I have spent the last week watching all the videos about the collapse and there are so many great points as to what happened. I am no expert but so much fits together logically. My question is about the size of the columns. I wish there was more explanation about the 24's and the 16's and why a 12X16 column was put in a critical area. Please don't tell me they used smaller columns so the cars could drive around easier in the garage.

@PrinceBlake 2 жыл бұрын

@@jeffostroff My hats off to you, Jeff for your diligence and also to Fiorella Terenzi, the astrophysicist who paused and announced '17' at the future location of the initial collapse. 17 was her parking space number. Her filming date was July 17th, 2020. In examining the construction of the universe I have discovered something which suggests time, in the form of quantum waves are the key ingredient of what we call substance and shockingly the path they trace out is a regenerative path born of an expanding path and an orbital path. Quantifying this wave has been no small task but through following signs from above and the great scientific minds I have made substantial headway. In the Summer of 2019 I identified '17' as the fundamental identity of time's arrow. 17 reflects the first of a long list of supersymmetric alignments that can be observed in modeling the wave. It's akin to saying 'nucleus'. I can only surmise that her assignment of parking space 17 and her diligence in capturing the garage is a reflection of the best of our ability to read the signs that nature is throwing our way all the time.

@stevephillips6106 2 жыл бұрын

Great work Jeff, all of your analysis has proved to be spot on. Thanks for taking the time to put all of this together and for sharing it.

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@KweeLewis 2 жыл бұрын

Brilliant, Jeff, absolutely brilliant. I can literally see what you are saying, why you are saying it, and where you are going with it. I appreciate that so much about you. Your conclusions are very well thought out, then presented in such an organized, intelligent and clear fashion to make them brilliant. So very well done. I agree with you on what appears to have happened. Thank you for all your time and effort, I’d say it’s worth it.

@jeffostroff 2 жыл бұрын

Glad you enjoyed it Rebecca

@stephenduffy5406 2 жыл бұрын

History repeats itself. A hundred years ago, engineers were examining the hull of RMS Olympic, to discover the weak points of her lost sister ship, RMS Titanic.

@jeffostroff 2 жыл бұрын

Yes, great point Stephen!

@TheSoundmanPete 2 жыл бұрын

Did you see the special on the fires that were burning in the coal bins on the Titanic ? The hull and one of the bulkhead doors was compromised by the excessive heat.

@newcarpathia9422 2 жыл бұрын

@@TheSoundmanPete That theory has been thoroughly debunked. That was a fairly common occurrence on ships in that time and yes, it happened on the Titanic. Ships of the time were built to easily withstand such a thing and it did not contribute to the iceberg damage in any way. However, there was an interesting side effect. The act of shifting the coal from the starboard to the port side resulted in Titanic taking around twice as long to sink than it would have normally.

@joannwill9748 2 жыл бұрын

And in both cases there was no single thing that caused the catastrophe

@lindaterrell5535 2 жыл бұрын

@@joannwill9748 It’s almost always a cascade.

@sevendyseven4090 2 жыл бұрын

Repeating my comment from a month ago: "Jeff, start doing garage walk thru's like you did on you vacation"..these are mesmerizing, glued to the seat vids!

@manrajchinjar7352 2 жыл бұрын

The quality and depth of this video is incredible. Thank you for helping us better understand this tragedy.

@jeffostroff 2 жыл бұрын

Thanks for watching, glad you liked it!

@thecollapseofchamplaintowe7199 2 жыл бұрын

Jeff Wow ! Mic drop 🎤 you absolutely nailed it. No one can even refute this at all . Even the positioning of the cones are interesting. That car exiting was perfect timing . Those overlays are brilliant. Lots of questions answered. Bravo.

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@getx1265 2 жыл бұрын

Thank you Jeff!! I appreciate your hard work getting this together for us!

@jeffostroff 2 жыл бұрын

My pleasure!

@Lv-nq9qz 2 жыл бұрын

I think your assessment is right on, I commented on another channel (I think it was called Building Integrity) that the beam spanning spot 27 looked bowed back when the garage tour video came out. I also called out the large crack in the slab that ran the whole way down the building in front of the ramp, and considered that to be a cause until the site was cleared and it showed the slab was more or less undamaged, even after the collapse. The thing is, the building started collapsing further west than where that column would have been. It could be explained that when that first column fell, the surrounding columns had to pick up the load and failed as a result. One column fails, the structure is compromised, two columns fail, the structure is risking collapse. But if a third column also failed, that would bring everything down. So I think what happened is that column 27/28 was the first failure in a series of failures that led to the collapse of the building.

@youtbe999 2 жыл бұрын

That column 27/28 in question is thin 12x18" and was designed to hold the loads of pool deck. Then, 27/28 has a beam connecting to a column 27 that holds the loads from the south edge of the building. Apparently, part of the loads from 27 were transferring to column 27/28 which was designed to hold only the pool deck.

@jeffostroff 2 жыл бұрын

That is the $1milliosn dollar question

@christianduval9067 2 жыл бұрын

Can't wait to see the real footage by the camera pool and also the garage camera.......great video Jeff appreciate your time and effort

@jeffostroff 2 жыл бұрын

Man, you got that right I am chomping at the bit just going crazy waiting for that video, I have put in a Freedom of Information act request into the Miami Dade PD but they have not gotten back to me, and I think it's because this is still considered a crime scene so they're not going to give up information like that yet. But they did give me the 911 calls when I asked for them

@mattbrawner7888 2 жыл бұрын

@@jeffostroff The only that footage would exist is if it was a cloud based security system.

@preston3698 2 жыл бұрын

@@mattbrawner7888 not actually it could have been in the main building that didn't collapse 🤔🤷🏼‍♂️

@CapStar362 2 жыл бұрын

@@mattbrawner7888 yup, and as it looks, no offsite or cloud based is available. even by chance a displaced backup would have been discovered if it was in a part of the tower that did not collapse before they condemned the remaining structure or was also contained in a portion that did collapse. but since we have not heard a single peep of a hint concerning it, either we have been fully gag ordered by a judge and LEO, and the media have been suppressed from revealing it.

@mattbrawner7888 2 жыл бұрын

@@preston3698 I wonder if they retrieved it. Seems like everyone was too scared of the remaining building.

@jmcenterprises9591 2 жыл бұрын

Jeff, great job on the video and the overlay clearly showing the missing column. Continuous water damage probably rotted and rusted the rebar into oblivion in the missing column, making it the weakest link and leaving almost no evidence that it ever stood there. Fabulous investigative work on your part.

@jeffostroff 2 жыл бұрын

Thanks JMC!

@avlnavybrat Ай бұрын

I watched everything that I could on TV about this collapse. I absolutely enjoyed your video.

@terranempire2 2 жыл бұрын

Basically the ramp ends at 14. Every thing beyond that is the floor. The “washing machine” you are circling in the center of the Screen is the letter C. If you look at the gates in a daytime photo. Both towers have a iron gate with a four pointed star motif. The South tower gate clearly has a iron “C” on the gate (presumably for the Champlain) well the North doesn’t. In the night footage it doesn’t appear until the image is enhanced. The telephoto effect and seeing through it makes it look like it’s behind the gate around the missing beam when in reality it’s on the gate.

@williammcbrayer3277 2 жыл бұрын

Yah, you can see the C and diamond (not star) at 14:30. The Street View on Google Maps shows this clearly.

@OK.Graycie 2 жыл бұрын

@@williammcbrayer3277 I went back to that timestamp and yes, clear as day that is a C.

@johnbergstrom2931 2 жыл бұрын

Wow, awesome catch. I just 'street view' Google mapped it. It's amazing how people see a washing machine when it's so clearly just a gate adornment... Good job!

@1965Beans 2 жыл бұрын

Wow great analysis again! Thank you for your insight. The shear column and 11.1 is definitely worth looking at. Also the point you raise with the people claiming that is a washing machine, if you note the gate, you will see the "C" for Champlain. I think that adds to the confusion. Keep up the good work!

@hoppy6141 2 жыл бұрын

Great comparison that is spot on..you’ve solved the question of how this happened. I have learned so much from your videos ❤️

@brianmahnke4720 2 жыл бұрын

Close but wrong

@leellendaddazio8389 Жыл бұрын

Jeff just found your channel. I always had a respect for older building. I have a 1929 built house. Your work is wonderful. I will keep you in my most watched list.

@Svartr.HrafnSvartr 2 жыл бұрын

IMO, your analysis has consistently made the most sense overall. When I first saw the tourist video, I immediately pondered why there seemed to be a column missing. When all the floorplans started coming out, they really do confirm it. It's hard to think that it couldn't be the first domino that started this catastrophic collapse. Such a sad, preventable event that has happened.

@jeffostroff 2 жыл бұрын

that was one valuable piece of intel, getting that tourist video

@RGJubilee 2 жыл бұрын

like always another great video. I think you hit it right on the nail.

@alexaltrichter1597 2 жыл бұрын

I feel you've done a fascinating overview of this collapse. I stumbled across your videos and find them so interesting, thank you. Sadly the building should have been condemned and either demolished or repaired many years ago.

@jeffostroff 2 жыл бұрын

At least now they know what to look for. 2 years ago there probably isn't a structural engineer in the world that would have walked in there and said yes this building is coming down but now people will have 2nd guesses about it when they see damage like this

@JohnVanDerDoe 2 жыл бұрын

Great video, once again. Been following and seen all previos. Keep up the good work. Greetings from Sweden.

@beboboymann3823 2 жыл бұрын

Your overlays of the still standing building are brilliant. It paints a clear picture that early in the collapse that column probably blew out at the base and toppled. Tremendous unequal loading took it out.

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@chiefinspector7280 2 жыл бұрын

Listen people.I am a state license combination inspector and i can tell you this sloppy work is everywhere, especially since Florida allows private inspectors. When I was a County inspector I went to final inspections done by private inspectors that had no inspections prior to the final. They flipped the script and said I forgot to do them. They attack and threaten the inspectors if they fail the wrong jobs. There are hundreds of other stories. Hire your own inspector to check everything that is inspected!

@jeffostroff 2 жыл бұрын

I've told my condo friends to have a Licensed structural engineer come in and check property every 3 to 5 years, and any major fixes that need to be made, they should have a second independent engineer peer review it.

@chiefinspector7280 2 жыл бұрын

@@jeffostroff yes and licensed trades also.

@gregwilliamson3001 2 жыл бұрын

Another piece of great investigative work, Jeff. Combining your video analysis with those of Josh (Building Integrity), really helps us understand this disaster. Extremely glad that you took the time and effort to visit the other apartment block and film a matching video of the witness's one. Keep up the great work. Looking forward to your future instalments on this subject. 👍🏻

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@mrmelmba Жыл бұрын

*A simple exercise:* For _each_ 100 pounds of _horizontal_ component of wind force directed against a north wall, each of the east and west outside walls that are at right angles to it takes up 50 pounds of force. If a third interior wall is added parallel to the east and west walls then each wall will take up 33.3 pounds of force. The floors that also transmit this horizontal component of force to the outside walls prevent concave deflection of the north wall. Horizontal force transmitted by the floors that is taken up by the footings of the columns and rear wall may be ignored for this analysis. Is a third interior wall of solid concrete required? (Referred to in some discussions as a shear wall). After calculating the force that the east and west walls must accommodate it is a matter of design choice. It is likely that the minimum thickness and strength of the east and west walls already greatly exceeds the horizontal force that these must hold back. Thus, for each 50 pounds exerted horizontally, the walls as a result of their strength to function as a wall supporting the vertical downward load from weight, are already capable of sustaining a horizontal component several times that amount, which is why the contribution of the footings was ignored. A building is designed so that the entire structure remains standing. That a collapse is only partial appeals to emotions, not logic. An interior wall of solid concrete that is not connected by rebar to the adjacent part of the building is in effect an _exterior_ wall to which an abutting structure has been added that encloses it making the whole thing appear to be a single building. Pre-construction-sales enabled raising capital for a much larger structure. The reason behind this two-phase approach is _finance,_ not engineering.

@islanderbyrd1881 2 жыл бұрын

I think you are absolutely right about M11.1 column, has already fallen in that photo taken by the tourists. Been following you since you began and check back frequently for updates. Thank you for all your hardwork.

@jeffostroff 2 жыл бұрын

Thanks for sharing

@LakeNipissing 2 жыл бұрын

Once again, super work, Jeff. Overlaying the north and south building parking areas for comparison was a great idea.

@derekmarshall6332 2 жыл бұрын

It would be interesting to see if the same column in the other building is also built in a shearing style.

@jeffostroff 2 жыл бұрын

yes, I'm desperately trying to get video from in there.

@d.t.4523 2 жыл бұрын

@@jeffostroff Fly a drone in there, when nobody is looking that is.

@kevinoverholtzer3126 2 жыл бұрын

@@jeffostroff i bet they have it guarded to keep out everyone I heard an interview with some of the residents and they fear being evacuated more than being crushed

@PatLyoutubepage 2 жыл бұрын

Is it a private garage with key access only and no visitors allowed in? If that's the case then it would be completely irresponsible.

@LakeNipissing 2 жыл бұрын

@@jeffostroff Be on a bicycle and ride in when the gate opens when a car drives out, waving to them in a friendly manner!

@MajorCaliber 2 жыл бұрын

Jeff "Sherlock" Ostroff doesn't miss a tick! Kudos sir!

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@PathosBedlam 2 жыл бұрын

Your assessment of the incident is spot on mate. Keep up the great work. Here's hoping the actual investigator is doing their job and looking at all sides of the evidence, including your video's. so that this never happens to any other people again.

@jeffostroff 2 жыл бұрын

Thanks Pathos

@jahunk300 2 жыл бұрын

Video overlay and analysis...very nicely done! Ironically the beam that was added for additional support to the pool deck may have transferred terminal stress to M9.1 collapsing the entire building. Arguably the exposed pool deck vulnerable to weather should have been deliberately disconnected from the tower structure.

@jeffostroff 2 жыл бұрын

Good call!

@markwonders3485 2 жыл бұрын

Jeff -- thanks for another great video. Comparing the images from the North building really helps. Regarding the "washing machine" at around the 14:50 mark -- if you're talking about the circular object that's plainly visible, then it's not actually anything inside the parking deck. It's the letter "C" (for "Champlain") in the diamond logo at the center of the gate of the parking deck. (If you're talking about something else that's visible behind the "C" then yeah, I guess it could be anything.)

@jeffostroff 2 жыл бұрын

yes we pointed out a few people see parts of the gate and get confused.

@ninjab952 2 жыл бұрын

I would have loved to see the area near the lobby that Josh from Building Integrity focused on that had the design change removing the step down and beams supporting that critical area to see if the same design flaw is present in the North towers.

@kineahora8736 2 жыл бұрын

Yes exactly-did they initially design the north tower with the step-down and associated beams? If so, did they remove that design feature before building?

@pammccallister553 2 жыл бұрын

I was thinking just that as I watched this video! Something else along this line is the eyewitness account of the survivor that was in the lobby and saw the parking area disappear. She obviously was hearing serious disintegration below her condo before that. Can anyone speculate as to the timing of the order? Pool deck, parking area, building? Or parking area, pool deck, building? And how does this tourist video fit in that overall timeline? Thank you.

@kineahora8736 2 жыл бұрын

@@pammccallister553 pool deck & parking area-They are one and the same. “pool deck” is a bit of a confusing term-it’s really the entire “lobby level” whether it happens to be ground-level parking or “pool deck”, it’s all one thing. So this slab (whatever you call it) failed before the building, that is clear. What isn’t entirely clear is what structural members failed first. Jeff seems to think it’s column 11.1, bringing the beam down, and then 9.1. I kinda am thinking it was the beam first, followed by 11.1 and a large portion of the “pool deck/parking area” that was witnessed, and then finally stress was too great on 9.1 which was a building column…

@TechandTools1 2 жыл бұрын

@@kineahora8736 Yeah, Building integrity did a good video about that beam and the column, if they failed then what forces would be applied to the other half and the bowed beam connects the column under the pool deck to the column under the front of the building (it's the column numbers you're talking about I'm pretty sure). If that column or beam gave out, it's tied directly to the front of the building, which would explain why it failed possibly. That definitely does seem to be the start of it all, with the core sample not repaired, planters, the pool deck was already at 99.xx something shear load (static) already according to building integrity's calculations, added palm trees and planters to that. It was a compounding effect in my opinion of all these that brought the building down. (Not to mention design flaws, older codes, shortcuts/cost savings, lack of maintenance, condo HOA in charge of a 12/13 story building looks like the president was an older woman probably not a structural engineer so doesn't know what to look for really, cost of repairs ect..). Unfortunately sometimes these things all come together and create the perfect storm. Can happen with anything, like they've said "not an engineer would have walked in there and said this building is coming down any minute". Sorry for the long response, I like structural engineering and physics.

@larrybe2900 2 жыл бұрын

@@kineahora8736 Does your theory hold up when you consider there being little rebar at the base of the one that failed first? It that one failed and brought the one end of the beam down and twisted the one it was attached to as the rest of the deck came down it (the second column 9.1?) became too tall of a column and easily buckled starting everything off. I am confused by the numbers.

@motorTranz 2 жыл бұрын

Superb analysis Jeff! Thank you!

@jeffostroff 2 жыл бұрын

Thanks, Motortranz!

@michaelshansen7070 11 ай бұрын

I love your channel, you do a great job! Lots of work I know.

@oldschoolkcaudits2382 2 жыл бұрын

If you look at the column behind the one that’s missing, you can see that it has major damage to it.

@jeffostroff 2 жыл бұрын

The column behind the collapsed column was actually in pretty good shape as we have seen in other pictures after the collapse outdoors at the pool deck any of the columns that were in the pool deck area were pretty much intact and still standing vertical

@oldschoolkcaudits2382 2 жыл бұрын

@@jeffostroff in the video 5 minutes before the collapse you can see the damage to that column behind the one that’s missing. It’s leaning and partially shattered

@MCDreng 2 ай бұрын

@@oldschoolkcaudits2382I'm going to trust photos taken in broad daylight after the collapse showing it's in good condition over grainy video from inside a parking garage

@robi4387 2 жыл бұрын

@jeffostroff Great image clean up and overlay. Your previous videos showing the condition of the underside of the pool deck suggested a punching failure. But one or two missing columns and images of very little rebar poking out of the ground between fluorescent cones suggests the columns crumbled, shattered/split somehow. I did say IMHO there were not enough main bars in these columns but that is comparing to current UK codes this was built in 1980. Without these columns the slab then had to span not one but two or three bays in catenary action.

@7YBzzz4nbyte 2 жыл бұрын

Must be a very useful analysis for the inhabitants of the north tower, to decide which beams need reinforcement etc. Very convincing with the overlay of the two garage gates, and especially thanks to the owner of the car who decided to drive out of the garage at the moment you shot the video so we, all the rest of us here on KZfaq, got a clear view.

@jeffostroff 2 жыл бұрын

I would love to buy that person lunch!

@QSSCEO 2 жыл бұрын

When any building is demolished...they blow out the columns first...The rest of the building fails under it's own weight. Your video nailed it...27/28 went first...the bowed beam failed and took the other columns with it... you end up with less and less support and down it goes. Great video Jeff!

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@NanageneBrenda 2 жыл бұрын

I’ve followed your analysis and appreciate the thoroughness. This event haunts me and breaks my heart. I keep wondering if/when will there be accountability…..I don’t believe this was a freak accident.

@jeffostroff 2 жыл бұрын

Some day, but probably 2 to 3 years away NIST will likely take 12 months, and remember architect is dead, builder is dead

@remotecontrol1082 2 жыл бұрын

Very few "accidents" don't have some combination of fairly minor problems that all kicked off when one failed and set off the catastrophe.

@johnbergstrom2931 2 жыл бұрын

Just chalk it up to a 'hit and run' job: A shitty design, shoddy construction and an absolute neglect of maintenance over decades. Architect, developer, inspector(s) and probably a lot of the construction workers who did this are already taking a dirt-nap, so there's no one 'bad guy' to blame. At least it will change things, raise awareness about inspections and keeping up on vital maintenance and repair.

@dutcha.4991 2 жыл бұрын

@@jeffostroff - yeah, NIST will get to the bottom of this collapse, just like they did with WTC Building 7. Although it took them many, many years to figure it out. They said the failure of one girder slipping off it's seat at column 73 led to the free fall collapse of the whole building in less than 7 seconds. It's probably true because the laws of physics didn't apply on September 11th, 2001. The day three modern steel framed high rise buildings comprising 267 stories were wiped out in less than 30 seconds by two airplanes.

@trishagail353 2 жыл бұрын

Great video!!! Love your analysis!!! I have a 'dumb' question regarding the beam. Was it part of the original architectural plans or maybe added later? Forgive my lack of knowledge, I'm just curious.

@jeffostroff 2 жыл бұрын

The beam was in the floorplan, along with many other beams

@richardburguillos3118 2 жыл бұрын

Nicely done… fascinating information and evaluation. Enjoying the series. Prayers for the families involved and impacted by this disaster. 🙏

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@The01sportster 2 жыл бұрын

This was mind blowing to watch how all the evidence came together. Due diligence, my friend.

@jeffostroff 2 жыл бұрын

Glad to help Paul!

@JRS2248 2 жыл бұрын

I think your assessment of the collapse is spot on. Thank You; for your time and insight; we would never get it from the powers that are examining this. If you know what I mean.

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@jacksons1010 2 жыл бұрын

I don’t see how or why you seem to assume there would be a cover-up. Maybe wait for the report before being so cynical?

@JRS2248 2 жыл бұрын

@@jacksons1010 The condition there has been looked at for three years prior to the incident. And no one noticed anything. Just looking at the ceiling in the parking garage should of rattled the bells somewhere. 50 years building, never have I seen a mess as big a mess as what I've seen here in all the videos presented by jeff ostroff. Yes people get cynical from work experiances.

@PMChic 2 жыл бұрын

Great job Jeff! Impressive work explaining the photography aspects in comparison to the columns. Can you look up the permit drawings for the landscape planter upgrade? It seems like the palm trees in the planter, the removal thereof and equipment weight may have been the root cause. Can you figure out the weight of the palm trees based on the height? And, how long the trees lasted (based on historical imagery)? Thanks for your time putting this together. ⭐️

@jeffostroff 2 жыл бұрын

We covered all of this in my videos from mid to late July we talked about all of this including the forklifts being brought onto the pool deck to possibly mount those palm trees, we showed the building permits in the engineering drawing we showed all of it

@williamsnyder6514 2 жыл бұрын

You covered it better than anyone thanks bro!

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@mattdomenic4814 2 жыл бұрын

I believe you’re right on track with your assessment. Excellent job! The people that shot that video 5 min. Before the collapse were hearing sounds that prompted them to take that video. What they heard is key to what was going on for sure. The broken water line must have been damaged from something falling that was very heavy. Great job!

@jeffostroff 2 жыл бұрын

They likely heard chunks of concrete starting to fall from the ceiling onto the floor that's the only thing that can make that kind of noise that would attract their attention. They were sitting pretty much directly across the opening into the garage ramp that is where the pool from the hotel next door is yeah. So you gotta figure they were about 120 feet away from where M 11.1 is and where likely most of the patio was dropping down there. But if you can imagine that huge sized area of the entire pool deck dropping down with that kind of nine inch thickness and weight of concrete, and all the planters, that's gotta make a heck of a noise. and that is probably what Sarah near in unit #111 was hearing she kept hearing what she thought was construction banging it was probably just chunks here and there falling down off of the ceiling until it all finally came down.

@jlw184 2 жыл бұрын

These videos have made me look at my own home where I found one area of rusted and expanded rebar due to a leaky drain on the 2nd floor. It was repaired sharpish I can tell you. Also my beams are 12" x 10" and that's just for a 2 storey house.

@jeffostroff 2 жыл бұрын

good beams!

@jlw184 2 жыл бұрын

@@jeffostroff Lol

@TofuInc 2 жыл бұрын

I think this is the best theory so far that anyone has presented. That beam almost looks like it was an afterthought or maybe part of a repair. I just don't see how it would have been designed in that way.

@gordonv2456 2 жыл бұрын

The beam looks like it was in the deck area and it looks pretty deep. Too deep/impractical to hide in the original pool deck slab. Many deck area beams got deleted possibly for vertical clearance issues in the basement parking area.

@christhomason3936 2 жыл бұрын

You have done such a Complete Job, we are sure all your videos will be entered as "Evidence". Thanks So Much for All Your Hard Work. EYL Chris and Rick From Chicago❤

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it!

@pchelloo 2 жыл бұрын

Well done! Thank you for great visuals. Much appreciated.

@jeffostroff 2 жыл бұрын

Thank you too!

@joeschmoe7221 2 жыл бұрын

Jeff, Love the channel and I think you’re really on to something. I’m curious; what do YOU think that large square block from the tourist video really is? Could a planter really have sheared thru the pool deck? Whatever it is, it looks largely intact. It’s hard to imagine that that’s actually the remains of the beam/column- I would think they’d be more pulverized (like the rubble on the floor).

@Lv-nq9qz 2 жыл бұрын

What was above the parking garage in that area? I think it was a fitness center, could it have been a large piece of equipment?

@jamesdavidson7135 2 жыл бұрын

I've looked at many of the comments... And I agree with the majority which mostly says THANK YOU. I believe (from benefit of watching many of your videos) that many mistakes were unfortunately made in that one area. No beam should be bearing any load when stubbed into the SIDES of pylons or jacks. No one should have been given authority to install that planter... And such profound bad luck that THAT ditz stuck it in the weakest part of the design/construction. No one should have been allowed to vote for their destruction by kicking the improvement can down the road.

@jeffostroff 2 жыл бұрын

yes, I think that 24" columns would have survived

@lenb9037 2 жыл бұрын

It is normal for most beams to be connected to a column "side". The main and basic consideration is whether the shear reinforcement is correctly specified, detailed and installed. The other problems in this case are whether the area was overloaded which seems likely from the information available and then whether it was maintained adequately which is in doubt.

@karenwhitley7211 2 жыл бұрын

Riveting!!!! Really enjoy hearing you explain the possible fault. Great job.

@jeffostroff 2 жыл бұрын

Thanks 👍 Karen!

@christinegilbert5082 2 жыл бұрын

I've fallen back into the rabbit hole of following the Southside condo collapse after having a break. Great content 🎩🎓🗽

@jeffostroff 2 жыл бұрын

Welcome back to the hole!

@dianev6180 2 жыл бұрын

Pleeeze go back video the beam in North Champlain. Great job!

@jeffostroff 2 жыл бұрын

If only I could get inside there. I am trying to find someone to get video

@Mikey-vx3yz 2 жыл бұрын

Great video as usual. To my eye, column 40 in the north tower is not in the same position as the one in the south tower. It would be really interesting if you could find a plan of the north tower's car park so that it could be superimposed over the one for the south tower - that would then take away all doubt about the similarity of column positions in the two car parks.

@jeffostroff 2 жыл бұрын

Interesting! might try that

@joannwill9748 2 жыл бұрын

Great video! The next thought that comes into my head is what columns compromised next and why. Keep the great videos coming!

@jeffostroff 2 жыл бұрын

That's the plan!

@DARWINZOO 2 жыл бұрын

Of Course you're from Boston. Of course. Cambridge girl here has now stopped scratching her head at why you have this presentation of self. You have a "Voice-over pro" voice. You speak clearly. You bring your audience to you and your curiosity. Your scientific knowledge brings us to the edges of our seats. You have technical prowess and motivation. I had No idea that this condo collapse would enthrall me for months. Monetize your talents. I'd watch tons of similar. Thanks so much for this Fun Ride with you!!!!! Claire

@jeffostroff 2 жыл бұрын

Thanks, I'm glad you liked it Claire!

@mjohnson9563 2 жыл бұрын

Jeff, I have watched hours and hours of videos from 4+ different engineers with each pointing out some interesting things (two minds work better than one). One question had to do with water in the garage coming from underground but when the building fell, the garage floor was still fully intact so that would eliminate corrosion between the pylon caps and the garage floor which was suspended about a foot above the pylon caps. Also, the pool deck leaked like a suive when it rained and it rains a ton in Miami. It appears that people were parking on the parking deck on the other side of the building right before that side of the pool deck fell. A parking car produces a lot of shifting movement and the planters on that side of the pool deck had no beam under them even though there were enhanced columns under that side of the building. Jeff, you visited that hotel in Ft. Lauderdale to show proper construction to ensure that nothing externally can bring down a building. It is very clear now that the pool deck fell and then brought the building down over a period of minutes. The building was poorly designed and constructed and poorly maintained. Yet, it was issued a COO back then and within a span of 40 years the engineering industry missed it big time. Sure, there was tons of talk about the pool deck failing but nothing on the building collapsing. Sure, buildings are generally built much better these days but still where is the accountability from the industry. A great example of improvements over time is the airline industry. Hopefully we don't see something like this again. Thanks for your hard work on all of this and thanks to all of the other engineers who also contributed on this disaster. A great team effort. Hopefully NIST can release their findings in the next 6 months but I think we have enough info on all of this. Thank you!

@jeffostroff 2 жыл бұрын

Likely NIST will release in 12 -18 months

@roycem4945 2 жыл бұрын

Totally dangerous design - as the collapse/failure of the deck and one, two or three columns should have not have taken down the building. There was no redundancy in the design. More deaths would have occurred if it wasn't for the stair shaft holding up / supporting a portion of the building.

@windsofmarchjourneyperrytr2823 2 жыл бұрын

You mean the shear wall? It's why portion 3 (front, back of front, tottering last piece) held on a few seconds. It was very inadequate, but had there been more there. It might have held longer

@Lv-nq9qz 2 жыл бұрын

Removing even one column from the equation is enough to cause a structure to collapse (depending on how it was built) nevermind if 2 or 3 also progressively failed.

@roycem4945 2 жыл бұрын

@@Lv-nq9qz the experts state the building lacked shear walls (it only had one that held up the part of the tower which survived) and a tiny useless one that for a few moments, held up part of the other side before collapsing. (Building's pool deck collapsed, then the center of the building collapsed, and then the side with the useless shear wall collapsed). AND - the building had some a huge section of columns well under the size needed. While the surviving side had the proper size. The experts have stated the building lacked redundancy in its structural design to prevent collapse from failed columns.

@Lv-nq9qz 2 жыл бұрын

@@roycem4945 the tiny useless shear wall you refer to actually made up the stair core in that part of the building. It wasnt useless, per say, just smaller by design because it only had to support the staircase.

@Ena48145 2 жыл бұрын

Incredible video and such a detailed analysis as always Jeff

@jeffostroff 2 жыл бұрын

thanks MM

@brianpurves5691 2 жыл бұрын

Extremely well done analysis... I am a caretaker who worked in a school with two huge trees in the three story atrim. We used to leave the hose on while watering and walked away. Many, many pounds of earth and water after a watering. My take. Take a dried potted plant and feel the weight before and after watering and multiply your results to a large planter holding a palm tree.

@jeffostroff 2 жыл бұрын

Thanks for sharing!

@JoeDurnavich 2 жыл бұрын

Jeff, is it possible there is stuff hanging down from the ceiling that is blocking the missing column from view? I see all sorts of grayish material seemingly coming down from the ceiling, but it is rather difficult to make sense of all that debris in the enhanced video image.

@jeffostroff 2 жыл бұрын

This is a possibility.

@theperfectpaintertoolreview 2 жыл бұрын

I agree with u. But what if the beam fell first since it was sagging, and hit the column and knocked it over.

@jeffostroff 2 жыл бұрын

That is entirely possible the beam could have fallen first, dragging M11.1 with it.

@barb963 2 жыл бұрын

Thanks for the information I have learned so much by watching your videos on the towers please continue to present the information in the same way you do as you are a great teacher and i like that how you explain things and I will continue to follow your cursor thanks again

@jeffostroff 2 жыл бұрын

More to come!

@fullraph 2 жыл бұрын

Fantastic analysis as always! I really appreciate your work. I hope were gonna get to see some security camera footage from inside the building some day...

@jeffostroff 2 жыл бұрын

I hope so too

@rager1969 2 жыл бұрын

Looks pretty compelling. I forget, where is that column in relation to that inspection hole near a plater that the engineering company ordered? It's near there, too, isn't it?

@KayInMaine 2 жыл бұрын

Yes, that is the area Jeff is talking about.

@jeffostroff 2 жыл бұрын

Yes look at 16:22 in the video, I reshowed you that screenshot from my July 18th video where I showed how it was interesting that made that 3x3 foot cut out up against the planter which is over column M11.1, see Test Probe A on the screenshot it shows you where it is there, and you can see the square column on the floorplan inside the planter box.

@MajorCaliber 2 жыл бұрын

Jeff, I don't think that dubious "shear" beam is _bowed,_ rather it appears that--being an afterthought (i.e. no cap/capital)--it's just _sloped_ from sloppy formwork (and lax inspection). Either way, with a just a bit better design and construction, it would've been a lot stronger... and many lives might've been spared.

@jackgoff4859 2 жыл бұрын

Everything else looks nice and straight in that video, other than that beam. How does a beam get sloped from sloppy formwork? I don't know how that process is done.

@jeffostroff 2 жыл бұрын

Yes It would be a sagging frame bottom

@johnbergstrom2931 2 жыл бұрын

Yeah, that's a good point. If it had bowed that much over time, you'd see some major crackage happening. Concrete has negligible elastic modulus.

@hotsoup1001 2 жыл бұрын

Does the other garage have the same overhead beam layout?

@gilzor9376 2 жыл бұрын

@@jeffostroff Was there any signs that this was repaired due to spalling? They may have pinned a form against the ceiling and pressure pumped in hydraulic cement with hand pumps. I have seen cases where the center was intentionally gapped larger to get more cement in the area that typically has more damage. This makes it look like the beam is deflecting.

@rondadams 2 жыл бұрын

Great work, and it seems your spot on. Thanks to these videos I'll never look at another multi-story building again without an inspecting eye looking for water damage.

@jeffostroff 2 жыл бұрын

This is good maybe going forward more people will pay attention to the buildings that you're driving into in can alert the decision makers when they spot trouble areas

@grege9601 Жыл бұрын

Great job analysis. Thanks for your efforts.

@jeffostroff Жыл бұрын

Much appreciated Greg!

@ronniecardy 2 жыл бұрын

Very good I bet you nailed it !!!! Some good luck catching a car as it left

@jeffostroff 2 жыл бұрын

Actually the Lord doubly blessed me, what you didn't really notice, was that there was two cars that came out within a few minutes so I got to have extended time with the gate open and to be able to zoom in to get better video.

@DARWINZOO 2 жыл бұрын

@@jeffostroff forget the lord just chat up one of the car drivers next time. Boston boy does that in his sleep

@ldhawthorne 2 жыл бұрын

Jeff- I can't thank you enough for these videos. I wish someone from Champlaign Towers North would allow you to walk the building with them. I know that an engineer said it was sound, but I'd love to know the process. Were they cutting into a lot of the columns to see if they were made with rebar too tightly or not enough? It looked like Champlaign South had 3 different general contractors. Hopefully, none were used at North!!!! And hopefully they didn't use the same width of columns in some areas. Thanks for all you do Jeff!

@preston3698 2 жыл бұрын

I'd love for someone to go video the parking garage in the other building so we can see if it's built the same and if the put brick pavers on top of the pool deck and is it leaking as well?

@simonbone 2 жыл бұрын

I'm surprised no-one living there has invited him. (I suspect more than a few CTN residents have been watching this, if only out of self-interest!)

@ldhawthorne 2 жыл бұрын

I agree @SimonBone. There's got to be residents of that building or someone who knows residents of that building watching Jeff's videos. I sure hope word gets over to someone and they bring Jeff over. He's been spot-on since day 1!!!!

@AtlantaTerry 2 жыл бұрын

@@ldhawthorne Lawyers.

@AtlantaTerry 2 жыл бұрын

@@simonbone Lawyers.

@QmeteK 2 жыл бұрын

nice one. great video as always

@debispilker4392 2 жыл бұрын

Thanks for the videos!

@jeffostroff 2 жыл бұрын

Glad you liked it Debi!

@larrybe2900 2 жыл бұрын

Jeff, has any engineer calculated the additional weight that was added to the pool deck with the addition of the sand and tile (trapped water)? How much weight would have been extra on the one column you are referencing as the first to fail beyond what it was when built without that material?

@jeffostroff 2 жыл бұрын

No, but josh at building integrity has calculated the pool deck as designed, and was shocked to see it was near 100% load with no people even on it.

@historylover13 2 жыл бұрын

@@jeffostroff When new tiles/pavers and planters that were not in the original design were added, I think that set disaster in motion. The deck had to be over 100% load and when weakened by water damage and corrosion, there was no chance for that building. Leaving the open tile cutout for two years right in the most vulnerable spot was a terrible mistake, and I don't understand why it was left that long...water was gushing down there. The whole incident is so very sad. I hope that buildings all over the state and especially near the ocean are having thorough inspections. I saw the video you did at the Marriott and it showed the peeling paint on the ceiling just like Surfside, so I suspect a lot of the buildings in the area have similar issues. Hopefully, this tragedy serves as a wake-up call and future disasters are prevented.

@Darkkfated 2 жыл бұрын

@@historylover13 I know modern design tends to worship concrete as the Miracle Building Material, but it still boggles my mind that all these places have underground parking garages (read: a literal basement) when they're only a few hundred feet from an entire saltwater ocean. Insanity.

@carschmn 2 жыл бұрын

@@jeffostroff I remember watching that video and thinking the deck could have been taken out by a big party.

@chiefinspector7280 2 жыл бұрын

@@jeffostroff add the moment applied when the slab sheared off

@trevorstewart8 2 жыл бұрын

From my observations it would appear that column M11.1 has exploded into dust from excessive weight, literally disappeared into fragments which concrete under compression load is known to do. That would explain the lack of debris on that floor and the rebar largely disappeared and notice the few rebars left were splayed like a flower. This would happen once the concrete no longer supported the rebar. Steel rebar's only duty in a column is to prevent this compression as steel has it best strength in tension, not compression.

@jeffostroff 2 жыл бұрын

Yes I'm still holding onto my theory that it didn't necessarily turn into a bunch of bits because simply the rebar won't allow that. I think that when the pool deck collapsed, part of it collapsed at an angle that then pulled on the column, causing it to rip apart from the ceiling and toppling over so I believe it was mostly intact where it fell onto the ground.

@mommachupacabra 2 жыл бұрын

@@jeffostroff I'm no engineer, just someone who's done renovation as a private person on my own place, with someone to teach me what goes where and why. From my work in tearing things out as well (stick built not concrete) I've been sitting here wondering what fell _against_ that column that just knocked it out from under the ceiling. That would have ripped that water pipe out that the tourist video shows gushing. You answered that for me in your reply above. Water damage is insidious, and people just don't take it seriously. It's just a little water, right? You should have seen what the water heater support "box" looked like when I got that far. I swear it was held up by the water line and coincidence.

@peppywood01 2 жыл бұрын

Great video! Thanks!

@casperchazz 2 жыл бұрын

🙏🏼 for all involved

@jeffostroff 2 жыл бұрын

Yes many prayers!

@WellsLarry 2 жыл бұрын

The core sample from the pool deck showed delamination. And, some of the rebar was cut. Maybe that is the key. Without the rebar tying things together, well..

@jeffostroff 2 жыл бұрын

Those guys screwed up the core in my opinion, you are supposed to use radar first to scan the area to avoid hitting rebar.

@johnbergstrom2931 2 жыл бұрын

The deterioration wasn't just in one small area. As far as I can tell, the pool deck was NEVER adequately waterproofed and there was corrosion, spalling and delamination in virtually the whole thing. Ticking time bomb.

@WellsLarry 2 жыл бұрын

@@johnbergstrom2931 Yes, but where they cut the rebar is where very near the center of ground zero.

@johnbergstrom2931 2 жыл бұрын

@@WellsLarry 'Ground zero' is a stretch. Nobody knows at this point where the first failure took place. I tended to believe the punching shear started on the pool deck, at the columns near the upper level parking (that white minivan in the photos) and progressively failed towards the building, taking out the exterior wall columns on the section that collapsed first. According to Josh @ Building Integrity, that was the "most overloaded" place in that entire building, in terms of punching shear. He did the difficult calculations and he knows his stuff. But I'm not completely sure. It seems to me that likely failure would occur at a compromised column supporting 12 stories of building above it, not one just holding up an empty slab. I don't know. Someday we will know, though...

@WellsLarry 2 жыл бұрын

@@johnbergstrom2931 I believe Jeff has got it right. The debris in the garage is a fact along with the missing column. All of which is damn close to where they cut the rebar when they took a core sample from the delaminated concrete. And, they did not repair the exploration.

@scottjohnston1028 2 жыл бұрын

First, if a car sped down and hit that column, those tourists across from the parking entry certainly would have heard such a calamity. Second, the car likely would still be in the spot where it hit the pillar. Those things are normally very solid and would not move if a car hit it. There was no report of a significant car crash sound from anyone. Second, if the deck anywhere around that planter/column area started to shear, the rebar and the planter and that beam would certainly be enough to pull that column down as it all started to collapse. Then, on the other end of that beam that certainly fell, the top of the first column under the building would have been compromised. Even if the top of that column stayed in place, it was likely very cracked and weakened and the vertical load at that point likely allowed the building above to start to drop by inches which would have caused structural cracking all the way up that vertical load and resulting in the eventual collapse. The building collapsed from tension all around that vertical load that shifted downward over that one column and the weight of the subsequent pancaking spreading out would do just as we witnessed for the full collapse. That bream being tied into the first building load column is significant. The pool deck weakening and collapsing started the event and very likely due to overall spalling, rusting and water saturation in the deck itself.

@jeffostroff 2 жыл бұрын

Good analysis Scott!

@keithschneidly3922 2 жыл бұрын

What about the eyewitness who said she heard noise "like a machine gun and then the building fell". Hey that's just like shape charges on columns during demolition. 😐

@Dr_KW 2 жыл бұрын

@@keithschneidly3922 you seem like the type of person who hears their house settling at night and swears it's a ghost 👻 👻👻

@keithschneidly3922 2 жыл бұрын

@@Dr_KW I'm not but I'm prepared for interlopers of any kind. Just relaying info I saw that's no less valid.

@begging4music 2 жыл бұрын

Good to hear Your voice Brother Jeff. Thank You for the video.

@jeffostroff 2 жыл бұрын

My pleasure

@mandog2142 2 жыл бұрын

After this you'll never look at condos, hotels or parking garages the same way. Good analysis.

@jeffostroff 2 жыл бұрын

Exactly! I already don't

@skipd9164 2 жыл бұрын

Its an eye opener

@williamralph5442 2 жыл бұрын

Amazing stuff. I agree, That beam collapsed and started a sequence of events. Maybe parking should be on ground level only. Thanks.

@jeffostroff 2 жыл бұрын

They can still do this as an underground parking lot it's done all the time successfully some of the things they could have done better was isolate that pool parking deck from this parking deck, and make some water columns instead of these skinny little 12 inch by 16 inch columns under the pool deck they should have all been 24 inch.

@Darkkfated 2 жыл бұрын

@@jeffostroff In terms of scale, they were basically holding up that pool deck with popsicle sticks.

@johnbergstrom2931 2 жыл бұрын

@@Darkkfated Not just the pool deck. The building too. They were 'holding up a refrigerator with popsicle sticks'. And it was all interconnected, so one failure would destroy the whole thing.

@Darkkfated 2 жыл бұрын

@@johnbergstrom2931 I agree, although (most) of the beams that were actually under the buildings themselves were larger and less rectangular than the ones that were closer to the pool itself. Those "pool deck only" columns were particularly egregious and when you add in the weight of all those unplanned, always-wet planter boxes and sand and pavers, well...

@johnbergstrom2931 2 жыл бұрын

@@Darkkfated Well, they should have had lots more shearwalls, too

@richardmorton1310 2 жыл бұрын

I wonder, viewing the tourist video that looks into the garage that shows the water cascading, what was the water source? Was it the stored water from the faulty renovation of the pool deck? Could that water, when draining from the pool deck, add to the instability of the structure? I do get it's less weight, but water is also not compressible but...

@jeffostroff 2 жыл бұрын

Richard, If you look at 17:08 into the video, and you'll see the man standing in the garage there that open space in front of him and next to the two black vehicles you'll see that giant white pipe up on the ceiling that is for the sprinkler system is my guess. And I believe that is the pipe that we're seeing hanging down and spewing water everywhere because once the pool deck collapsed it would cut right through that pipe

@TomDotCom2 2 жыл бұрын

@@jeffostroff Possibly irrigation or domestic water pipe. I think most high-rise automatic fire sprinklers have an alarm that is triggered by water flow through the system. If this building had a functioning sprinkler alarm, it should've been heard by residents or picked up in the audio of the tourist video