Hello can you please tell me how to calculate PGV?
@rathishhegde48453 ай бұрын
Hey. In the last minute of the video, you did mention that you will be doing a video with Damper. But I couldn't find the video? Can you please share me the link?
@rathishhegde48453 ай бұрын
Thank you
@seymurakbarov17424 ай бұрын
Great Video!
@nabindahal80435 ай бұрын
Do you also offer Etabs software class? I would like to know and if yes I like to take courses with you online.
@pinakiadak10256 ай бұрын
Sir in the macro we can not see any rs generate button. Even from macro I can not generate the graphs
@ylmazylmaz222 Жыл бұрын
thx a lot mate u the beast
@zhafranabel6179 Жыл бұрын
i love u, u made my thesis easy
@wazir252 Жыл бұрын
soft soil increases the shaking 5:16
@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 inward 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.¹³ The reason behind this two-phase approach is _finance,_ not engineering. ¹³ For each dollar investors advance for the cost of constructing a 100-unit building unknown to them these funds are sufficient to build twice as many units. The 80-unit addition that effectively costs them nothing accrues to the organizers.
@user-sl1kf1oh4n Жыл бұрын
Dear Sir there is no generate option in the excel sheet even after unblocking macros in the file
@erginulutas54198 ай бұрын
Can you activate the generate option. I could not see
@user-lb9dj4zq2e Жыл бұрын
Hi sir just came across this great video, seems when the excel file was uploaded to google drive the macro was deleted somehow...can't see any buttons or code when open the file on my local folder.
@devashishrajpoot3610 Жыл бұрын
same for me
@a.alperakis45859 ай бұрын
same for me
@lamatoyoda1506 Жыл бұрын
Thank you for the great content. I can not generate the RS as you did.. would you please advise me.
@erginulutas54198 ай бұрын
me to. Is the problem macros. I could not find
@blue_niib Жыл бұрын
Sir can you make a vedio on CSIbridge having damper and laminated rubber bearing
@sheykwaoswin7240 Жыл бұрын
Please why is that when i download the excel file the not everything is inside. No area to generate response as it's in the video
@rabinsonrai2905 Жыл бұрын
Hello sir, can you make another video explaining the reason behind other buildings? As a engineering student, I feel these kind of videos are insightful and motivational.
@kenaizon9621 Жыл бұрын
Do I need to consider the torsional effect on two storey residential building due to architectural reason?
@raminmobini6176 Жыл бұрын
Perfect explaination. thank you
@iWillRun_ Жыл бұрын
is it possible for you to link where you bought raw materials you used for physical demonstration ?
@sreekanth4966 Жыл бұрын
Great Video! Key Take aways 1. Soil_Structure interaction effects 2. Short buildings experience higher acclerations i.e, vigorous shaking while Tall buildings( Flexible buildings with higher natural frequencies) experiences higher displacement demands subjected to the soil on which it is resting. I mean short buildings resting on loose soil experiences lesser shaking compared to Tall buildings on loose soil ( Resonance effect). Thanks a lot for this video it is really great that you have used excel to create these plots which I feel a tedious job👏👏.
@crewley_2 жыл бұрын
Hey, why do you neglect the amortization of the system and why can you do it please ?
@ashokkumardas47812 жыл бұрын
Structurally crazy? Why mad?
@khaledaly70072 жыл бұрын
great informative video for describing Torsional irregularity ....Thanks alot
@sam2wmc2 жыл бұрын
Another engineer commented on a Miami Herald article that hypothesized some reasons for the building collapse. He reviewed a analysis done by professor Dawn Lehman from the University of Washington. I re-watched your presentation, and was taken by your structural "tug of war" analogy. Professor Lehman thinks that it is possible that the perimeter wall was holding up the pool deck through tension, and this was preventing the pool deck / parking punch shear from occurring. She hypothesized that the new building pathway construction directly adjacent to the wall caused additional damage and water intrusion into the concrete perimeter wall, causing the rebar to rust and fail through stress. Another engineer hypothesized that the problem may have been caused by long term thermal expansion/contraction - as the pool deck has no expansion joints running parallel to the portion of the building that collapsed. He stated that the concrete deck temperature change on the day of the collapse probably was somewhere around 65 degrees, resulting in a change in pool deck dimension of over 6", and the reason that the collapse happened in the middle of the night was that this was a time of maximum stress (coolest time of the day). This certainly accounts for eye witness accounts stating that the pool deck collapsed first. As in your tug of war analogy, when the rebar started to snap, it was like the rope breaking and the concrete slab being pulled toward the tower. As the slab fell progressively until it reached the front of the ill-fated structure. The planter reinforcement beams just in front of the building likely dropped down only on one side, putting additional stress on the perimeter building columns that they were attached to, and slab separation likely pulled some concrete away, further weakening the columns. From there, it was just a matter of minutes before the building collapse occurred. I was wondering what your thoughts are on this hypothesis. I can give you a link to the Miami Herald article and the engineer's analysis if you want to look at either of these in more detail.
@pepelapew27242 жыл бұрын
More BS, one pool deck and 12 stories same amount of columns
@waveisocean2 жыл бұрын
Your demonstration is so well explained! I appreciate that you also took the time to talk about typical solutions to this problem! Fantastic work! I look forward to more videos!
@jasons84792 жыл бұрын
It's nothing short of miraculous that it stood for as long as it did. No wonder it failed in such a sudden and spectacular fashion.
@rushabhsonaiya76012 жыл бұрын
hey. could you please answer this query of mine .how do rcc slabs act in real life structures when lateral forces act on them. do they act as a rigid diapgragm or a semi rigid diaphragm.are they designed for any lateral forces acting on it?
@JinalDoshi912 жыл бұрын
Hello, the rigidity of the diaphragm should be based on the diaphragm deformation compared to the deformation of the lateral system. Rigid or semi rigid are analysis perspective. If the diaphragm is a long span diaphragm, then there will be additional diaphragm deformations which should be accounted for, and it's flexibility / rigidity can also impact the load distribution between multiple LFRS frames. In such scenarios assigning a rigid diaphragm for analysis wouldn't make sense. But if the diaphragm is relatively stiff and short span, then you can assume it to be rigid. Although it is not as simple as this to classify the diaphragm as rigid or semi rigid. It also depends on openings in diaphragm, layout of LFRS system, torsional irregularity, span to depth ratio of diaphragm and so on. ASCE 7 as well as NEHRP design provisions will give you a very good explanation on how to determine the rigidity of diaphragm for analysis purposes. And the diaphragms are and should always be designed for the lateral forces acting on them. That is the primary load path on how the forces get into and out of the LFRS system.
@rushabhsonaiya76012 жыл бұрын
thank you for your response sir.i look upto be like you😃
@lousekoya18032 жыл бұрын
Very interesting Sir ! Apparently , they also added a Penthouse at the last minute that was not supposed to be there and brought extra load !
@pfcoop12 жыл бұрын
Very technical analysis. Well done!
@luisfevel2 жыл бұрын
You can get the book here for free: libgen.is/ LIBGEN
@rickybowen48072 жыл бұрын
So it could be that those heavy planters on the pool deck. No punch sheer rebar on the column = DOOM
@rickybowen48072 жыл бұрын
You can clearly see one of those planters in the garage. Guess what it was sitting over a column and the column is gone it sheered it away.
@maudessen5732 жыл бұрын
Thank you so much for having created this detailed analysis, Jinal. I am wondering if there is a way to correlate a collapse sequence with witness statements from prior to the building collapse at 1:22 AM. Basically, the witness statements can be boiled down into seven observations that we currently know of: 1. ~3-4 AM in 1211, heard unusual, loud cracking sounds 2. At 11 PM in 111, heard ongoing banging sounds that increased in intensity over time 3. 1:10 AM in the lobby and in 111, heard something fall 4. <1:15 AM in the garage by the elevator, heard loud cracking sounds 5. ~1:15 AM in the lobby, saw the parking deck collapse 6. 1:18 AM looking down the garage ramp, saw debris and possibly Column M11.1 was damaged or collapsed 7. <1:22 AM from 410, saw the pool deck had collapsed
@Mark-ct5lq2 жыл бұрын
Great video Jinal! Thanks for your work on this.
@chrisgrunstra18032 жыл бұрын
Do you people ever scope out goggle maps ..you can see rot on every building in florida.you can litterly see the water damage on a sunny day seeping thru the cement and cracks condo scams
@romeoriguer86852 жыл бұрын
Wow. The way you explain it makes the topic easy to understand. Thank you sir for making this video. It greatly helps me understand my report. Anyway, What do you called that magnetic model that you have ?
@doolomer88732 жыл бұрын
Subscribed nd calling others to subscribe
@doolomer88732 жыл бұрын
Are u jinal dhoshi? The one we search more than any other
@juliocampos92182 жыл бұрын
I do believe that only one column was disable ( not supporting a load) the one align with deck column 27 , because it was 7 minutes and cracking of walls was reported several floors above for 3 to 5 minutes yet showing that adjacent columns were also twisting and lateral load by a now much larger span , more than 30 feet. and the failure of three ( 3 ) columns would cause a much more rapid collapsing. basically this building construction could not support itself without a single column.
@James_Bowie2 жыл бұрын
At 34:38 --- that step beam that you show, was that not deleted in a January 1980 drawing?
@StructuralMadness2 жыл бұрын
Hey James, the beams that were removed in plan revision were present at a different location. The revision happened between grid lines J through K and 12 through 14. These step beams and additional support beams have always been present on drawings even after revisions. These are also visible in the Garage video.
@chiefinspector72803 жыл бұрын
You found out about those assholes in the Eng.Tips forum! They are scum
@Kevin-pc6fu3 жыл бұрын
Mr. Madness - I commend you for your professional examination into the tragic Champlain Tower collapse and I would like to express my sincere appreciation for your willingness to mentor the public on these engineering topics. I see that your video has inspired true professionals, such as Bill J and others, to participate by providing additional info and insightful commentary from their perspective. They too deserve to be recognized for their contributions. Hopefully some of the next generation of engineers being pumped out by the universities and NCEES are paying attention and seeing the value of the information being provided here. I also hope that they take the Engineer's Creed to heart as they progress in their careers. Your video is the most relevant to date and it is apparent that you have a thorough and practiced knowledge of structural design and the construction process. I would venture to guess that you have spent some time on job sites with the contractors. That is one element of an engineer's education that I feel may not be occurring as often as it should. Engineers can learn alot from reputable contractors. I have. There are other posted videos on this collapse that are getting alot of views and have accumulated many subscribers. While they do a great job of aggregating historical documents, events, and wittness accounts; they are lacking in their knowledge of fundamental engineering concepts that most certainly played a role in this collapse. A few concepts that I recall from them are; deep foundations, tributary areas, moments, design loads, frame interaction and punching shear. My reason for bringing this up is not to be critical, rather to caution viewers that some of their concept explanations are flawed. My personal favorite was a video that attempted to demonstrate/explain tributary areas and "punking shear". Some of your viewers will know the video I am referring to. A close second was one which alleged that the collapse occurred due to the failure of post tension cables. My hope is that the viewers understand that, even if someone is presenting their self as a professional in the field, it is possible that they are speaking about topics that are outside of their area of expertise. I noticed that a few of your most critical commenters are likely doing just this. All the while, you are still providing responses in a respectful way and practicing the virtue of humility while doing it. Excellent example of living by the Engineer's Creed that I mentioned earlier. Thank you for what you do. I wish the best to you, your family, and the lucky few that get the opportunity to have you as a mentor.
@StructuralMadness3 жыл бұрын
Hey Kevin, thank you for such a meaningful comment. I think humility comes from the religion that I follow since I was born and it is just natural for me to be respectful. Yes you did get it right, the reason behind creating this video was just to educate the wider range of people which I do feel are still mislead by many professional on the KZread platform. I don't want to call anyone out again because I don't want to spark an unnecessary conflict and secondly I don't have time or capacity to answer some of the nonrelated issues and baseless claims. People are worried about Palm trees that were sitting right on top of column below which means they didn't cause any additional stress to slabs, they are worried about modern cars, but 1977 Florida building code specified 50psf as parking load vs 40 psf today. There is also a fine line between the loads that were present during collapse vs the loads that it was designed for as well as there is a significant variability on what the actual strength of section was. Like an element showing demands exceeding capacity doesn't necessarily mean that it will collapse immediately. It just means that the capacity is less than code prescribed limits. The actual capacity is way more based on test bias and actual material strength. It is also greater based on the methods of analysis that we use and the approximations that we have to conduct from reinforcement placement requirements. And it is hard to educate the general population how it all links together. The famous channels do come up with dramatic titles to attract people and they started jumping on conclusion as soon as collapse occurred, but no body bothered doing actual calculations. Even today there is not a single channel that talks about this which is very disappointing because as you mentioned, they are just misguiding people. Again, there is just so much we can do, but we can at least try.
@gregadams5583 жыл бұрын
Look at what "Building Integrity" found today. Changes to plans removed beams that affected parking and planter areas.
@StructuralMadness3 жыл бұрын
Hey thank you for commenting. I have known about those changes prior to making this video, but the reason why I have just focused on the revised drawings because they were used to build the pool deck. And not just the regions with cars, but in general the pool deck in around 2000-2500 sq feet was definitely under designed.
@cherrylove36563 жыл бұрын
wow this guy's the best of all them other people that up loaded video's about the collapse he knows what he's talking about he's not guessing like the others did and the difference is this guy is a real professional not some know it all bozo like the rest I learned more with this one video then all them others put together
@StructuralMadness3 жыл бұрын
I appreciate your comment! This was such a tragic event that I don’t like to put together insignificant issues on collapse. I just want to let everyone know on a fundamental level why it happened and it is such a rare event. The other channels are just scaring people instead of directly stating that this was a bad design and not every building is like this. A lot of people messed up in this case.
@kevinoverholtzer31263 жыл бұрын
you should look at the twin tower to the north of this is that one going to fail
@StructuralMadness3 жыл бұрын
As I mentioned there were multiple overlapping factors. Since North tower had different management, they would have maintained it differently and could have minor design as well as construction differences. These differences could go a long way in terms of building damages / performance under daily usage. So it is not as simple as simple extrapolating that if South building failed, then north is also bound to fail.
@kevinoverholtzer31263 жыл бұрын
i remember a long time ago a dance floor in India collapsed and after listening to this video it makes since that the floor collapsed they had two people per sq ft on that floor.
Пікірлер
Hello can you please tell me how to calculate PGV?
Hey. In the last minute of the video, you did mention that you will be doing a video with Damper. But I couldn't find the video? Can you please share me the link?
Thank you
Great Video!
Do you also offer Etabs software class? I would like to know and if yes I like to take courses with you online.
Sir in the macro we can not see any rs generate button. Even from macro I can not generate the graphs
thx a lot mate u the beast
i love u, u made my thesis easy
soft soil increases the shaking 5:16
*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 inward 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.¹³ The reason behind this two-phase approach is _finance,_ not engineering. ¹³ For each dollar investors advance for the cost of constructing a 100-unit building unknown to them these funds are sufficient to build twice as many units. The 80-unit addition that effectively costs them nothing accrues to the organizers.
Dear Sir there is no generate option in the excel sheet even after unblocking macros in the file
Can you activate the generate option. I could not see
Hi sir just came across this great video, seems when the excel file was uploaded to google drive the macro was deleted somehow...can't see any buttons or code when open the file on my local folder.
same for me
same for me
Thank you for the great content. I can not generate the RS as you did.. would you please advise me.
me to. Is the problem macros. I could not find
Sir can you make a vedio on CSIbridge having damper and laminated rubber bearing
Please why is that when i download the excel file the not everything is inside. No area to generate response as it's in the video
Hello sir, can you make another video explaining the reason behind other buildings? As a engineering student, I feel these kind of videos are insightful and motivational.
Do I need to consider the torsional effect on two storey residential building due to architectural reason?
Perfect explaination. thank you
is it possible for you to link where you bought raw materials you used for physical demonstration ?
Great Video! Key Take aways 1. Soil_Structure interaction effects 2. Short buildings experience higher acclerations i.e, vigorous shaking while Tall buildings( Flexible buildings with higher natural frequencies) experiences higher displacement demands subjected to the soil on which it is resting. I mean short buildings resting on loose soil experiences lesser shaking compared to Tall buildings on loose soil ( Resonance effect). Thanks a lot for this video it is really great that you have used excel to create these plots which I feel a tedious job👏👏.
Hey, why do you neglect the amortization of the system and why can you do it please ?
Structurally crazy? Why mad?
great informative video for describing Torsional irregularity ....Thanks alot
Another engineer commented on a Miami Herald article that hypothesized some reasons for the building collapse. He reviewed a analysis done by professor Dawn Lehman from the University of Washington. I re-watched your presentation, and was taken by your structural "tug of war" analogy. Professor Lehman thinks that it is possible that the perimeter wall was holding up the pool deck through tension, and this was preventing the pool deck / parking punch shear from occurring. She hypothesized that the new building pathway construction directly adjacent to the wall caused additional damage and water intrusion into the concrete perimeter wall, causing the rebar to rust and fail through stress. Another engineer hypothesized that the problem may have been caused by long term thermal expansion/contraction - as the pool deck has no expansion joints running parallel to the portion of the building that collapsed. He stated that the concrete deck temperature change on the day of the collapse probably was somewhere around 65 degrees, resulting in a change in pool deck dimension of over 6", and the reason that the collapse happened in the middle of the night was that this was a time of maximum stress (coolest time of the day). This certainly accounts for eye witness accounts stating that the pool deck collapsed first. As in your tug of war analogy, when the rebar started to snap, it was like the rope breaking and the concrete slab being pulled toward the tower. As the slab fell progressively until it reached the front of the ill-fated structure. The planter reinforcement beams just in front of the building likely dropped down only on one side, putting additional stress on the perimeter building columns that they were attached to, and slab separation likely pulled some concrete away, further weakening the columns. From there, it was just a matter of minutes before the building collapse occurred. I was wondering what your thoughts are on this hypothesis. I can give you a link to the Miami Herald article and the engineer's analysis if you want to look at either of these in more detail.
More BS, one pool deck and 12 stories same amount of columns
Your demonstration is so well explained! I appreciate that you also took the time to talk about typical solutions to this problem! Fantastic work! I look forward to more videos!
It's nothing short of miraculous that it stood for as long as it did. No wonder it failed in such a sudden and spectacular fashion.
hey. could you please answer this query of mine .how do rcc slabs act in real life structures when lateral forces act on them. do they act as a rigid diapgragm or a semi rigid diaphragm.are they designed for any lateral forces acting on it?
Hello, the rigidity of the diaphragm should be based on the diaphragm deformation compared to the deformation of the lateral system. Rigid or semi rigid are analysis perspective. If the diaphragm is a long span diaphragm, then there will be additional diaphragm deformations which should be accounted for, and it's flexibility / rigidity can also impact the load distribution between multiple LFRS frames. In such scenarios assigning a rigid diaphragm for analysis wouldn't make sense. But if the diaphragm is relatively stiff and short span, then you can assume it to be rigid. Although it is not as simple as this to classify the diaphragm as rigid or semi rigid. It also depends on openings in diaphragm, layout of LFRS system, torsional irregularity, span to depth ratio of diaphragm and so on. ASCE 7 as well as NEHRP design provisions will give you a very good explanation on how to determine the rigidity of diaphragm for analysis purposes. And the diaphragms are and should always be designed for the lateral forces acting on them. That is the primary load path on how the forces get into and out of the LFRS system.
thank you for your response sir.i look upto be like you😃
Very interesting Sir ! Apparently , they also added a Penthouse at the last minute that was not supposed to be there and brought extra load !
Very technical analysis. Well done!
You can get the book here for free: libgen.is/ LIBGEN
So it could be that those heavy planters on the pool deck. No punch sheer rebar on the column = DOOM
You can clearly see one of those planters in the garage. Guess what it was sitting over a column and the column is gone it sheered it away.
Thank you so much for having created this detailed analysis, Jinal. I am wondering if there is a way to correlate a collapse sequence with witness statements from prior to the building collapse at 1:22 AM. Basically, the witness statements can be boiled down into seven observations that we currently know of: 1. ~3-4 AM in 1211, heard unusual, loud cracking sounds 2. At 11 PM in 111, heard ongoing banging sounds that increased in intensity over time 3. 1:10 AM in the lobby and in 111, heard something fall 4. <1:15 AM in the garage by the elevator, heard loud cracking sounds 5. ~1:15 AM in the lobby, saw the parking deck collapse 6. 1:18 AM looking down the garage ramp, saw debris and possibly Column M11.1 was damaged or collapsed 7. <1:22 AM from 410, saw the pool deck had collapsed
Great video Jinal! Thanks for your work on this.
Do you people ever scope out goggle maps ..you can see rot on every building in florida.you can litterly see the water damage on a sunny day seeping thru the cement and cracks condo scams
Wow. The way you explain it makes the topic easy to understand. Thank you sir for making this video. It greatly helps me understand my report. Anyway, What do you called that magnetic model that you have ?
Subscribed nd calling others to subscribe
Are u jinal dhoshi? The one we search more than any other
I do believe that only one column was disable ( not supporting a load) the one align with deck column 27 , because it was 7 minutes and cracking of walls was reported several floors above for 3 to 5 minutes yet showing that adjacent columns were also twisting and lateral load by a now much larger span , more than 30 feet. and the failure of three ( 3 ) columns would cause a much more rapid collapsing. basically this building construction could not support itself without a single column.
At 34:38 --- that step beam that you show, was that not deleted in a January 1980 drawing?
Hey James, the beams that were removed in plan revision were present at a different location. The revision happened between grid lines J through K and 12 through 14. These step beams and additional support beams have always been present on drawings even after revisions. These are also visible in the Garage video.
You found out about those assholes in the Eng.Tips forum! They are scum
Mr. Madness - I commend you for your professional examination into the tragic Champlain Tower collapse and I would like to express my sincere appreciation for your willingness to mentor the public on these engineering topics. I see that your video has inspired true professionals, such as Bill J and others, to participate by providing additional info and insightful commentary from their perspective. They too deserve to be recognized for their contributions. Hopefully some of the next generation of engineers being pumped out by the universities and NCEES are paying attention and seeing the value of the information being provided here. I also hope that they take the Engineer's Creed to heart as they progress in their careers. Your video is the most relevant to date and it is apparent that you have a thorough and practiced knowledge of structural design and the construction process. I would venture to guess that you have spent some time on job sites with the contractors. That is one element of an engineer's education that I feel may not be occurring as often as it should. Engineers can learn alot from reputable contractors. I have. There are other posted videos on this collapse that are getting alot of views and have accumulated many subscribers. While they do a great job of aggregating historical documents, events, and wittness accounts; they are lacking in their knowledge of fundamental engineering concepts that most certainly played a role in this collapse. A few concepts that I recall from them are; deep foundations, tributary areas, moments, design loads, frame interaction and punching shear. My reason for bringing this up is not to be critical, rather to caution viewers that some of their concept explanations are flawed. My personal favorite was a video that attempted to demonstrate/explain tributary areas and "punking shear". Some of your viewers will know the video I am referring to. A close second was one which alleged that the collapse occurred due to the failure of post tension cables. My hope is that the viewers understand that, even if someone is presenting their self as a professional in the field, it is possible that they are speaking about topics that are outside of their area of expertise. I noticed that a few of your most critical commenters are likely doing just this. All the while, you are still providing responses in a respectful way and practicing the virtue of humility while doing it. Excellent example of living by the Engineer's Creed that I mentioned earlier. Thank you for what you do. I wish the best to you, your family, and the lucky few that get the opportunity to have you as a mentor.
Hey Kevin, thank you for such a meaningful comment. I think humility comes from the religion that I follow since I was born and it is just natural for me to be respectful. Yes you did get it right, the reason behind creating this video was just to educate the wider range of people which I do feel are still mislead by many professional on the KZread platform. I don't want to call anyone out again because I don't want to spark an unnecessary conflict and secondly I don't have time or capacity to answer some of the nonrelated issues and baseless claims. People are worried about Palm trees that were sitting right on top of column below which means they didn't cause any additional stress to slabs, they are worried about modern cars, but 1977 Florida building code specified 50psf as parking load vs 40 psf today. There is also a fine line between the loads that were present during collapse vs the loads that it was designed for as well as there is a significant variability on what the actual strength of section was. Like an element showing demands exceeding capacity doesn't necessarily mean that it will collapse immediately. It just means that the capacity is less than code prescribed limits. The actual capacity is way more based on test bias and actual material strength. It is also greater based on the methods of analysis that we use and the approximations that we have to conduct from reinforcement placement requirements. And it is hard to educate the general population how it all links together. The famous channels do come up with dramatic titles to attract people and they started jumping on conclusion as soon as collapse occurred, but no body bothered doing actual calculations. Even today there is not a single channel that talks about this which is very disappointing because as you mentioned, they are just misguiding people. Again, there is just so much we can do, but we can at least try.
Look at what "Building Integrity" found today. Changes to plans removed beams that affected parking and planter areas.
Hey thank you for commenting. I have known about those changes prior to making this video, but the reason why I have just focused on the revised drawings because they were used to build the pool deck. And not just the regions with cars, but in general the pool deck in around 2000-2500 sq feet was definitely under designed.
wow this guy's the best of all them other people that up loaded video's about the collapse he knows what he's talking about he's not guessing like the others did and the difference is this guy is a real professional not some know it all bozo like the rest I learned more with this one video then all them others put together
I appreciate your comment! This was such a tragic event that I don’t like to put together insignificant issues on collapse. I just want to let everyone know on a fundamental level why it happened and it is such a rare event. The other channels are just scaring people instead of directly stating that this was a bad design and not every building is like this. A lot of people messed up in this case.
you should look at the twin tower to the north of this is that one going to fail
As I mentioned there were multiple overlapping factors. Since North tower had different management, they would have maintained it differently and could have minor design as well as construction differences. These differences could go a long way in terms of building damages / performance under daily usage. So it is not as simple as simple extrapolating that if South building failed, then north is also bound to fail.
i remember a long time ago a dance floor in India collapsed and after listening to this video it makes since that the floor collapsed they had two people per sq ft on that floor.