This is the most intelligent and relevant TEDx lecture I've ever seen. The point of human knowledge is to make life free from dangers, earthquakes included. Structural Engineering shall be a line of endeavor into which a strict course in Ethics and on the Philosophy of man shall be taught. This would make Engineers in this field take human life more valuable than profit in the exercise of their profession.
Today many will realize how important this lecture is. He had clearly highlighted and warned, turkey in particular, that countries in plates boundaries are in high risk zone for great disasters come as earthquakes may strike at any time and the catastrophe that will unfold if the present model (8i.e 10years ago) of building or constructing a house in such a model continues. He had taught how to build a resilient building that can withstand any earthquakes that will save thousands lives but sadly the same models of constructing a building continues even today 2023.
Great talk Dr. Stein, earthquake risk for infrastructures in particular for buildings couldn't be explained better. Because we see rare large events in the US, it doesn't mean that the risk is not there. In fact, each day the risk of a major earthquake that can impact a metropolis in the US such as the San Francisco Bay Area or Los Angeles region elevates.
The corner bracing was an interesting point in Ross Stein's video. This would be especially relevant for retrofitting "soft first story" buildings. There are other methods of bracing or stiffening available as seen especially in Japanese earthquake engineering. Infill walls or shear walls act as bracing as well. In all cases of bracing, you also don't want the building to become overly stiff. The columns need to be stronger than the braces or infill walls, otherwise the bracing could do more harm than good. Also a stiffer building has a shorter resonant frequency, which may not be desirable. The bracing needs to be engineered well to maintain sufficient ductility. It's all a bit more complicated than the explanation in the Ted talk.
I like the very intuitive way triangulation of the concrete building has been modelized and explained. It is undisputable that triangulation is very important in any structure, included the reinforced concrete one. Amazingly, it is not common in concrete buildings for several reasons, including: a) Huge difficulties for realizing braces on site; b) It is assumed that lateral resistance of buildings is properly assured by shear walls; c) Challenges in building masonry walls within a triangulated structure. That is one of the reasons why using precast skeleton frame makes a lot of sense: beams, columns and braces. If we add precast framed floors and walls to such a structure, it results in a lightweight, highly triangulated concrete building. Its performance in “defeating earthquakes” is then greatly increased. Furthermore, the additional cost of 15% which could be due to triangulation in case of cast in situ construction, is largely compensated by huge advantages of using precast building elements. The company Nova Building Ltd is making field trials of the same in Kenya.
Ohh...Watching this right after the Turkey/Syria earthquake really removes all doubt who is to blame for the massive devastation if there was any doubt to begin with. Idk which one would be more appropriate to say - that this vide has aged well or not... So frustrating and infuriating. Literally tens of thousands of lives could`ve been saved. And it`s not like mr. Stein here was the only one warning about this. Let`s just hope that we`ll finally shift all our effort towards prevention rather than dealing with the outcome. And I mean this in a general perspective not just in regards to earthquakes.
As a person living in Istanbul this talk made me anxious about what's lie ahead... It's been 21 years since that earthquake and especially the people who are in charge still denies the grim possibility of an another earthquake... There are barely wide areas where people can go in case of such events and believe me the government takes no actions. I deep down know that my chances of surviving such a big earthquake that will happen next time are quite low because even if I get myself out of the building I will not be able to go somewhere safe. %99 of the streets are way too narrow and the amount of constructions are out of control. They just keep building new ones if they spot a tiny emptiness to get their pockets filled with some extra money... Idk if God exists but if he does may he saves us...
Time to vote for politicians who care about their people with actions, not mere words. If we talking about Turkey- then I sadly agree with you… the Turkish population is not in the hands of a person who cares for his people - - it’s in the hands of a man who cares about his family. Erdogan is too busy focusing on issues outside the country ratter then inside… from Libya to Syria… it’s all a waste of valuable resources. Turkey needs to focus on preparing for the big one (God forbid) and not on making big headlines in the media. People who care , not people who are loud should be voted in, alas Erdogan will place another family member into a position they do not deserve yet alone understand much like the finance ministry. The Turkish people this can not count on their government. And the civilians themselves need to educate themselves in earthquake advancement and introduce them into their dwellings personally. There is little doubt erdogan’s palace will stand… erdogans large family live in homes constructed to the highest international levels… it’s time to bring those levels to the population. Stay safe!
Almost all shops in the Philippines are "soft first story" buildings with two or three heavy stories on top. Even some condominiums have been built with a soft first story for parking. One such building went down in 2019 due to a 6.5 earthquake, even though it was built by one of the most prestigious developers in the country. Most of these soft first stories could be retrofitted with vertical steel braces.
he talked about Turkey, he was spot on, sadly, few countries are taking real measures, Romania is in a huge risk as well, we expect 7.9-8 but we are not even ready for 7.8 :(
Listening to this talk after Turkey’s & Syria’s 2023 horrific earthquake 😞 So sad that thousands of people died although this earthquake must have been less tragic 😞
just check Japan solutions for this...different solutions for reducing effect of earthquakes on buildings & designs are already there...likely better and cheaper than this above...
Thank a lot for your helpful video. What about half moon instead of triangle in column and beam connection ? Could the durability be more like the dome of churches and mosques?
Well the real questions beg: . what is factual % of buildings with isolation systems and . what % of buildings are completed under prescribed compliance code(s) since the 1999 quake?
1:00 You demonstrated how “strong” that building is, but you failed to explain what effect such a building would have on the objects and people within it. 3:40 32 ft/s^2 is free fall. Vertical structural members provide a significant amount of resistance Unless those vertical structural members are somehow vaporized, buildings won’t experience free fall.
What about North America? California, San Andres fault, Mexico City with one of the larges population in the world,... Lots of interesting graphics, but no further information on the missing regions of the globe.
He's talking stiffness, Strength !! Earthquake is much more than that !! I disagree with his explanation of knee braces !!! But his overall explanation was worth listening ! His one nonsensical citation is at 15 :40 where he mentioned Balakot, which is in India !!
Suppose we took your corner brace idea and beefed it up to put about 30 braces for every corner. Congratulations... you've built a wall! So just about every home has 30 braces per corner.
However not every wall in a building is a load bearing wall and these walls will very likely give when the stress/pressure becomes nontrivial, which is highly likely in a major earthquake. That's the reason we need extra beams and buttresses to consolidate structures, a thing that they do extremely well in Japan and that makes all the difference between an earthquake there and say Indonesia.
Every earthquake engineer knows that the fist model is much more resistant to an earthquake.... Earthquakes like two things 1. is stiffness(the more rigid the building is the more EQ force it demands) 2. is mass (THe heavier the building is the more EQ force it demands )... simple as that
11.50 where is nepal? you are showing most effected place in south asia and yet you have no idea there is a nation named Nepal, which is actually the most prone to earthquake you keep on saying india.
This is a big fake!!. Please don't use a geophysicist to talk about structural engineering. Ductility is more important than rigid buildings which by the way they are extremely expensive.
1. The lateral resistance of a building is by far the principal factor which contributes to “defeating” earthquakes. Such braces are the most effective way to triangulate the structure and thus achieve a high degree of lateral resistance of the building to earthquakes. 2. In second position comes the reduction of the weight, to lower the energy due to acceleration/deceleration. 3. Among other factors, ductility of the materials. All things being equal, a building made of ductile structure will resist better, due to its capacity to dissipate the quakes energy. 4. It is not obvious that a simple rectangular square is more ductile than a triangulated one. Indeed, if the corner (concrete joint) collapses even at a very limited extent, one could hardly expect it to recover its full strength when the source of deformation is removed.
Importance of ductility is important in a "strong column-weak beam" building. But story drift is often underrated aspect of the building which in some sense increases with ductility for large earthquakes. Many academicians rather lean towards the stiffer building than ductile one. I do agree with the first line though.
This is the most intelligent and relevant TEDx lecture I've ever seen. The point of human knowledge is to make life free from dangers, earthquakes included. Structural Engineering shall be a line of endeavor into which a strict course in Ethics and on the Philosophy of man shall be taught. This would make Engineers in this field take human life more valuable than profit in the exercise of their profession.
We need this Video to be Shared with Architects, Owners & Developers. Some of them Do Not want to listen.
It was such an amazing explanation of seismic risk and how to defeat it just by rising our awareness about it. Good Job!
Today many will realize how important this lecture is.
He had clearly highlighted and warned, turkey in particular, that countries in plates boundaries are in high risk zone for great disasters come as earthquakes may strike at any time and the catastrophe that will unfold if the present model (8i.e 10years ago) of building or constructing a house in such a model continues. He had taught how to build a resilient building that can withstand any earthquakes that will save thousands lives but sadly the same models of constructing a building continues even today 2023.
Puerto Rico need this kind of teaching and engineering skills.
Excellent! Ross has a gift. He can boil down a complex matter and make understandable to those who need to hear what he and the USGS has to say.
Agreed
We are proud to have Ross chair GEM's Scientific Board. Thanks Ross for making GEM and what we are doing together known to the world!
It was a wonderful speech and very informative. I could learn plenty. Thank you very much.
Great talk Dr. Stein, earthquake risk for infrastructures in particular for buildings couldn't be explained better. Because we see rare large events in the US, it doesn't mean that the risk is not there. In fact, each day the risk of a major earthquake that can impact a metropolis in the US such as the San Francisco Bay Area or Los Angeles region elevates.
And the potential for damage gets greater, and greater, and greater.
Much better to have constant slippage such as in Parkfield, California.
The corner bracing was an interesting point in Ross Stein's video. This would be especially relevant for retrofitting "soft first story" buildings. There are other methods of bracing or stiffening available as seen especially in Japanese earthquake engineering. Infill walls or shear walls act as bracing as well. In all cases of bracing, you also don't want the building to become overly stiff. The columns need to be stronger than the braces or infill walls, otherwise the bracing could do more harm than good. Also a stiffer building has a shorter resonant frequency, which may not be desirable. The bracing needs to be engineered well to maintain sufficient ductility. It's all a bit more complicated than the explanation in the Ted talk.
Good points. Talk to a structural engineer familiar with your area. I live in Sacramento which as been rated fairly safe.
Who's here after 2023 Turkey and Syria earthquakes
Yup, still no lessons learnt. Still cutting corners.
Here from syria
Your friend in Hawaii 😎🇺🇸
Yes. I'm watching a lot of the older structural engineering videos since last week. There must be a better way than what just happened......😢
Nobody listened and after Turkey people will eventually forget again.
I like the very intuitive way triangulation of the concrete building has been modelized and explained.
It is undisputable that triangulation is very important in any structure, included the reinforced concrete one.
Amazingly, it is not common in concrete buildings for several reasons, including:
a) Huge difficulties for realizing braces on site;
b) It is assumed that lateral resistance of buildings is properly assured by shear walls;
c) Challenges in building masonry walls within a triangulated structure.
That is one of the reasons why using precast skeleton frame makes a lot of sense: beams, columns and braces.
If we add precast framed floors and walls to such a structure, it results in a lightweight, highly triangulated concrete building.
Its performance in “defeating earthquakes” is then greatly increased.
Furthermore, the additional cost of 15% which could be due to triangulation in case of cast in situ construction, is largely compensated by huge advantages of using precast building elements.
The company Nova Building Ltd is making field trials of the same in Kenya.
Beautifully explaining complex matters in simplifying way, Thank you Ross
Wow!!I'd say that was a power talk!!People need to realize the need to retrofit buildings in disaster-prone areas.
Ohh...Watching this right after the Turkey/Syria earthquake really removes all doubt who is to blame for the massive devastation if there was any doubt to begin with. Idk which one would be more appropriate to say - that this vide has aged well or not... So frustrating and infuriating. Literally tens of thousands of lives could`ve been saved. And it`s not like mr. Stein here was the only one warning about this. Let`s just hope that we`ll finally shift all our effort towards prevention rather than dealing with the outcome. And I mean this in a general perspective not just in regards to earthquakes.
7:00 The reason of the tragedy in 2023. This video was uploaded in 2012. Dont be lazy, ask your politicians!
As a person living in Istanbul this talk made me anxious about what's lie ahead... It's been 21 years since that earthquake and especially the people who are in charge still denies the grim possibility of an another earthquake... There are barely wide areas where people can go in case of such events and believe me the government takes no actions. I deep down know that my chances of surviving such a big earthquake that will happen next time are quite low because even if I get myself out of the building I will not be able to go somewhere safe. %99 of the streets are way too narrow and the amount of constructions are out of control. They just keep building new ones if they spot a tiny emptiness to get their pockets filled with some extra money... Idk if God exists but if he does may he saves us...
Time to move out
Time to vote for politicians who care about their people with actions, not mere words.
If we talking about Turkey- then I sadly agree with you… the Turkish population is not in the hands of a person who cares for his people - - it’s in the hands of a man who cares about his family. Erdogan is too busy focusing on issues outside the country ratter then inside… from Libya to Syria… it’s all a waste of valuable resources.
Turkey needs to focus on preparing for the big one (God forbid) and not on making big headlines in the media.
People who care , not people who are loud should be voted in, alas Erdogan will place another family member into a position they do not deserve yet alone understand much like the finance ministry.
The Turkish people this can not count on their government. And the civilians themselves need to educate themselves in earthquake advancement and introduce them into their dwellings personally. There is little doubt erdogan’s palace will stand… erdogans large family live in homes constructed to the highest international levels… it’s time to bring those levels to the population.
Stay safe!
well u was right about the earthquake but luckily it didn't hit near Istanbul for u
Bruh ... ❤️🇹🇷
You where right
So very well explained.
Brilliant lecture we must learn from others.
Almost all shops in the Philippines are "soft first story" buildings with two or three heavy stories on top. Even some condominiums have been built with a soft first story for parking. One such building went down in 2019 due to a 6.5 earthquake, even though it was built by one of the most prestigious developers in the country. Most of these soft first stories could be retrofitted with vertical steel braces.
Thanks at present, we are facing this situation of disaster (EQ) in Nepal, it is an eye opening lecture.
I'm watching this after turkey earthquakes sad 😔, rip 47k souls 😢 🙏 💔
That top of the India is NEPAL he is referring actually and during 2015 the biggest earthquake happen in Nepal.
he talked about Turkey, he was spot on, sadly, few countries are taking real measures, Romania is in a huge risk as well, we expect 7.9-8 but we are not even ready for 7.8 :(
Listening to this talk after Turkey’s & Syria’s 2023 horrific earthquake 😞 So sad that thousands of people died although this earthquake must have been less tragic 😞
Good informative video.
who else is watching for a stem project
i'm making a stem lesson for my students ;)
✋
Bro help I need pdf of the project
Does anyone have an idea what he used to connect the join in his models? Thank you
Magnets
No, seismic isolation is essential. It's not just the building but the contents too
thanks for making it so simple to understand!
Philippines Manila is one of the hazardous place on Earthquake
Thank you sir
It's so important for me.
Great education program more women into construction and design .
Wonderful The difference is the outcome for Hati or Chile
And yet the danger occured in current scenario due to soft building in Turkey earthquake
Thank you for this nice talk.
And alas, you have designed the perfect pergola.
Me recuerda el edif de Miami creo en 2022, que se desplomo sin ningun sismo, por tener grandes fallas estructurales ....
just check Japan solutions for this...different solutions for reducing effect of earthquakes on buildings & designs are already there...likely better and cheaper than this above...
this is architecture 101
Thank you for your good idea. May I try to teach the students.
Thank a lot for your helpful video. What about half moon instead of triangle in
column and beam connection ? Could the durability be more like the dome of churches and mosques?
Superb.
1999 Izmit earthquake in Turkey.
Thank you for the presentation.
We are now much better in the construction industry.
?)
Well the real questions beg:
. what is factual % of buildings with isolation systems and
. what % of buildings are completed under prescribed compliance code(s) since the 1999 quake?
Engineers in Ecuador has noticed that itsnew building code NEC 15 has several flaws
1:00 You demonstrated how “strong” that building is, but you failed to explain what effect such a building would have on the objects and people within it.
3:40 32 ft/s^2 is free fall. Vertical structural members provide a significant amount of resistance Unless those vertical structural members are somehow vaporized, buildings won’t experience free fall.
Great
Round steel frame.
Get a quote... Easy Quake Insurance
What about North America? California, San Andres fault, Mexico City with one of the larges population in the world,... Lots of interesting graphics, but no further information on the missing regions of the globe.
Who else is here for science class.
what did he say at 5;40 a hunk of ?
Styrofoam.
So clever
Geometry that utilize external force.
Yeah, machine learning.
How I know it.
Physics
He's talking stiffness, Strength !!
Earthquake is much more than that !!
I disagree with his explanation of knee braces !!!
But his overall explanation was worth listening !
His one nonsensical citation is at 15 :40 where he mentioned Balakot, which is in India !!
Please put columns and beam in the middle sir.
Please don't show the man's face only we want to see the attached video's
We must learn to build better in places where the risks is high...chilling bones sayings.. But sarcastic
👍🏻
Vedi su TH-cam " antisismico su rulli autocentranti per gravità ", brevetto n° 0001429105 di Vincenzo Casa.
I'm in school
Suppose we took your corner brace idea and beefed it up to put about 30 braces for every corner. Congratulations... you've built a wall! So just about every home has 30 braces per corner.
However not every wall in a building is a load bearing wall and these walls will very likely give when the stress/pressure becomes nontrivial, which is highly likely in a major earthquake. That's the reason we need extra beams and buttresses to consolidate structures, a thing that they do extremely well in Japan and that makes all the difference between an earthquake there and say Indonesia.
dhaka 😨😨😨😨😨
Every earthquake engineer knows that the fist model is much more resistant to an earthquake.... Earthquakes like two things 1. is stiffness(the more rigid the building is the more EQ force it demands) 2. is mass (THe heavier the building is the more EQ force it demands )... simple as that
Proof?
11.50
where is nepal?
you are showing most effected place in south asia and yet you have no idea there is a nation named Nepal, which is actually the most prone to earthquake you keep on saying india.
Nope. Don't use a geophysicist to talk about structure and seismic design of structure. I can assure you as a civil engineer.
civil engineer here , agree.
This is a big fake!!. Please don't use a geophysicist to talk about structural engineering. Ductility is more important than rigid buildings which by the way they are extremely expensive.
exactly :D Its just interesting to hear his talk, not actually what happens in real case.
1. The lateral resistance of a building is by far the principal factor which contributes to “defeating” earthquakes.
Such braces are the most effective way to triangulate the structure and thus achieve a high degree of lateral resistance of the building to earthquakes.
2. In second position comes the reduction of the weight, to lower the energy due to acceleration/deceleration.
3. Among other factors, ductility of the materials. All things being equal, a building made of ductile structure will resist better, due to its capacity to dissipate the quakes energy.
4. It is not obvious that a simple rectangular square is more ductile than a triangulated one. Indeed, if the corner (concrete joint) collapses even at a very limited extent, one could hardly expect it to recover its full strength when the source of deformation is removed.
@@casanova6734I recommend you to read to Anil K. Chopra.
Importance of ductility is important in a "strong column-weak beam" building. But story drift is often underrated aspect of the building which in some sense increases with ductility for large earthquakes. Many academicians rather lean towards the stiffer building than ductile one. I do agree with the first line though.
No one can defeat earthquicks 💀💀☠☠
ya know i liked this video until i saw the fact they they said “Columbia” instead of Colombia which is how you spell the country😑🙄
all the people coughing during are transmitting corona