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Paul Kassabian
United States
Приєднався 28 лют 2012
Paul Kassabian is a structural engineer who enjoys explaining how structures work so others can understand them and participate in better conceptual design. Paul taught at Massachusetts Institute of Technology (MIT) for ten years and currently teaches and advises on structural design at Harvard’s Graduate School of Design. He is a full-time Principal at SGH in Boston, MA and specializes in structural design of buildings, bridges, and sculptures.
Why Soap Bubbles Are Perfect!
Soap bubbles are beautifully perfect and perfectly beautiful! Here I talk about how soap bubbles work, how they’re not always spheres, and how this helps us design better, lighter structures!
Two wonderful books on this topic I can recommend:
• “Soap Bubbles: Their Colors and Forces Which Mold Them” by C.V. Boys
• “A Drop Of Water: A Book of Science and Wonder” by Walter Wick
About Me:
Hi, I'm Paul Kassabian. I'm a structural engineer and a Principal at SGH in Boston, MA. Being a structural engineer is my fulltime job and I’ve also I taught full courses to graduate students at MIT for nine years, Harvard's Graduate School of Design (GSD) for five years and at RISD (Fall 2023). These are videos based on my structural design projects and years of teaching structures to students.
Some legal/professional stuff:
As of this video, I’m a:
• Licensed Structural/Civil Engineer in 26 US States including my home state of Massachusetts.
• Professional Engineer in British Columbia
• Chartered Structural Engineer in the UK (both ICE and IStructE)
So my full designations are: Paul E. Kassabian, P.E., P.Eng (BC), C.Eng MICE MIStructE
MUSIC:
I purchased a license for use from Pond5.com
The item ID number is 32695415.
AdKey:p2A94LX-QZ4MW3
Publisher: Kero Herning - IPI/CAE: 825536431
Composer: Kero Herning - IPI/CAE: 825536431
Title: Happy Positive Playful
License : Individual License for Commercial Use.
Two wonderful books on this topic I can recommend:
• “Soap Bubbles: Their Colors and Forces Which Mold Them” by C.V. Boys
• “A Drop Of Water: A Book of Science and Wonder” by Walter Wick
About Me:
Hi, I'm Paul Kassabian. I'm a structural engineer and a Principal at SGH in Boston, MA. Being a structural engineer is my fulltime job and I’ve also I taught full courses to graduate students at MIT for nine years, Harvard's Graduate School of Design (GSD) for five years and at RISD (Fall 2023). These are videos based on my structural design projects and years of teaching structures to students.
Some legal/professional stuff:
As of this video, I’m a:
• Licensed Structural/Civil Engineer in 26 US States including my home state of Massachusetts.
• Professional Engineer in British Columbia
• Chartered Structural Engineer in the UK (both ICE and IStructE)
So my full designations are: Paul E. Kassabian, P.E., P.Eng (BC), C.Eng MICE MIStructE
MUSIC:
I purchased a license for use from Pond5.com
The item ID number is 32695415.
AdKey:p2A94LX-QZ4MW3
Publisher: Kero Herning - IPI/CAE: 825536431
Composer: Kero Herning - IPI/CAE: 825536431
Title: Happy Positive Playful
License : Individual License for Commercial Use.
Переглядів: 1 229
Відео
3D Printing 3 Ways! Concrete + Metal + Glass!
Переглядів 2,4 тис.Місяць тому
I’ve worked on structural design projects with 3D printed concrete, 3D printed metal, and 3D printed glass…that’s pretty amazing! We’re in the early days of this new material production technology so here I provide an overview of the different materials/processes along with the projects I’ve worked on and some info on the current people and firms doing wonderful work! It will be fascinating to ...
MIT + Harvard Lecturer Reacts to “For the Birds”!
Переглядів 1,2 тис.2 місяці тому
When I teach I like to bring in “real life” examples…here’s a twist on that with my react video to “For the Birds”…an excellent short cartoon from Pixar! About Me: Hi, I'm Paul Kassabian. I'm a structural engineer and a Principal at SGH in Boston, MA. Being a structural engineer is my fulltime job and I’ve also I taught full courses to graduate students at MIT for nine years, Harvard's Graduate...
MIT’s Futuristic New Entrance Canopy!
Переглядів 14 тис.2 місяці тому
How do you create a new entrance for the world-famous MIT? I did the structural design of this stunning project and, in this video, I’ll go through the concept design, how it was built with carbon and glass fiber, optimized with AI/machine learning, and fabricated by boat builders! Here’s our technical paper published in Structure magazine: www.structuremag.org/?p=26609 Also many thanks to SOSO...
Why Bamboo and 3D Printed Metal are the Same!
Переглядів 4,1 тис.3 місяці тому
When things have a purpose you’ll find they’re designed for that purpose! There’s evidence of design. Even though, on first glance, bamboo and 3D printed metal seem to be opposites they have a lot in common when we think about them from a design point of view! Recently I found myself explaining specific projects I’ve designed that used bamboo and a separate one that used 3D printed metal and re...
Why 3 bridges in 1? The fascinating Albert Bridge in London UK!
Переглядів 3,9 тис.6 місяців тому
The Albert Bridge in London is a unique 3-in-1 bridge! That’s 3 bridge systems on top of each other in one span! There’s the original “Ordish-Lefeuvre” system, which is a cable-stayed bridge with an upper suspension cable that supports the middle of the deck. That’s 1. There were added vertical hangers soon after it opened from the upper cable to the deck which makes a full suspension bridge. T...
The Pantheon Dome and its Amazing Structure! With Linda Seymour PhD
Переглядів 4,4 тис.6 місяців тому
The Pantheon in Rome is a breathtaking space! At 2,000 years old, it’s also the world’s largest unreinforced concrete dome! So how has it lasted so long? I’ll show you around the Pantheon, explain how domes work (and how much the Pantheon is a full structural dome), and Linda Seymour provides detail on Roman concrete. Linda did her PhD at MIT on ancient Roman concrete and we both work at SGH in...
Wire, Rope, Strand, or Cable?! Do you know the Difference?
Переглядів 9 тис.9 місяців тому
I’ve designed a range of structures using tension from suspended sculptures to pedestrian bridges and larger bridges. A critical item to know is the difference between wire, strand, rope, and cable. Using the right one in the right application and with the right design approach can be critical to structural safety. In this video I go through the differences, show you examples from real projects...
10 Trusses You Need To Know! (and 1 Bonus!)
Переглядів 24 тис.9 місяців тому
There are so many “types” of trusses and in this video I go through the differences between them, how they got their different names, and which aren’t actually trusses even though they say they are! 0:00 Introduction 0:29 HOWE TRUSS 0:41 COMPRESSION 1:07 PRATT TRUSS 1:40 WARREN TRUSS 2:15 TOWN LATTICE TRUSS 2:38 K-TRUSS 3:12 FINK TRUSS 3:36 KING POST TRUSS 4:05 QUEEN POST TRUSS 4:38 SCISSOR TRU...
Tensegrity Structures!
Переглядів 42 тис.10 місяців тому
Tensegrity structures always seem impossible and that’s mainly because the compression elements are not connected to each other. We’re used to buildings and structures being somewhat “stacked” but here that doesn’t happen. They still work when the tension elements provide a state of self-equilibrium. In this video I discuss how tensegrity structures work and what they have been, and could be, u...
Harvard Model Bridge Testing! Trusses and Beams
Переглядів 2,3 млнРік тому
Harvard Model Bridge Testing! Trusses and Beams
Modular Structures: Avoid These Big Mistakes!
Переглядів 20 тис.Рік тому
Modular Structures: Avoid These Big Mistakes!
Lifting the 1,200 Ton Gateshead Millennium Bridge!
Переглядів 11 тис.Рік тому
Lifting the 1,200 Ton Gateshead Millennium Bridge!
Why Do Café Tables Wobble? (Structures 6-5)
Переглядів 8 тис.2 роки тому
Why Do Café Tables Wobble? (Structures 6-5)
How Prestressing Works! (Structures 6-4)
Переглядів 36 тис.2 роки тому
How Prestressing Works! (Structures 6-4)
How Beams Work! (Part 2): Structures 6-2
Переглядів 166 тис.3 роки тому
How Beams Work! (Part 2): Structures 6-2
How Beams Work! (Part 1): Structures 6-1
Переглядів 49 тис.3 роки тому
How Beams Work! (Part 1): Structures 6-1
How Columns Work! (Part 2): Structures 4-2
Переглядів 21 тис.3 роки тому
How Columns Work! (Part 2): Structures 4-2
How Columns Work! (Part 1): Structures 4-1
Переглядів 17 тис.3 роки тому
How Columns Work! (Part 1): Structures 4-1
Which Shell Structure Wins? (Structures 3-1)
Переглядів 13 тис.3 роки тому
Which Shell Structure Wins? (Structures 3-1)
How Arches Work! (with Diagrams!): Structures 2-2
Переглядів 56 тис.3 роки тому
How Arches Work! (with Diagrams!): Structures 2-2
How Do Arches Work? (with Demo!): Structures 2-1
Переглядів 38 тис.3 роки тому
How Do Arches Work? (with Demo!): Structures 2-1
How Cables Work - With Diagrams! (Structures 1-2)
Переглядів 16 тис.3 роки тому
How Cables Work - With Diagrams! (Structures 1-2)
Polybridge 3 right here
As an adult this is quite significantly a stupid waste of time being english doesnt you make smart and talking in academic jargon just further proves how egotistical human beings are in the grand scheme
the first bridge shows that the Asian magician who went on Penn and Teller to do some tricks with coins was right when he said: No matter how good you think you are, there will always be an Asian better than you. (or something like that, i cant remember the exact quote. But it was a beautiful quote and so true as you can see here. )
btw, seems the bridges are just resting on the table. I would imagine that in real life the ends are anchored into place as well. And so, i would think that the first one would not have flipped like that if the ends were anchored. Btw, it seems it only flipped, it did not break because of the weight, correct? Btw, the third bridge we see in this video, it only broke down because the weights fell over. I wonder how much it could have taken if it had not collapsed due to the weights falling over. PS: This is a great video sir, thanks for showing it to us arm chair pilots./
compression force acts on both upper & lower cords of the truss that is in the rafter & lower cord # therefore we cantilevers are necessary to decrease the compression in both upper & lower cords #🇵🇰
I think I would've flourished in a class like this. But I grew up poor, therefore deserve nothing good I guess.
Thank you for sharing this knowledge. As an owner of a company expanding into modular, these insights are very valuable. Cheers
Glad it was helpful!
I feel sorry for are future bridge's, what ever project's 🤦🏻♂️🤦🏻♂️ i just got a diploma and LA city welding certs, journeymen ironworker 🤦🏻♂️🤦🏻♂️😅😅
Just started understanding why my favorite Skateboards are concaved!! Thank you! Lol
Masterclass in how to lose a toe
great video, super clear, thank you!
hey pointdexter
"I'm Paul's second daughter" And I express myself as an engineer 😂❤
You said others professors are wrong because pasta competitions only show one is good at building with pasta. Materials and requirements will change in the next 70 years. People are supposed to be able to work with multiple materials and adapt their knowledge to various environments and challenges. Will Harvard diplomas be cancelled if we stopped using wood and aluminum, cause if you use wood in a project you can only be good at building with wood?
They should wear safety steel toe shoes
There's a Stephen Fry book up on the shelf.. Nice! 😀
Yes! You’re the first one to comment on that…you win “first to comment on that”.
Torque?
5:05 lol I thought that one was a 2 by 4 this whole time
Steeltoes wouldn't hurt
the floppy cables thing reminds me of restringing and tuning a guitar. It's easier to do on better guitars.
Until it broke, I thought that second one was just a 2 by 4.
I enjoyed this video! It reminded me of my own college experience at the Purdue University School of Engineering and Technology at Indianapolis. I was in a double degree program that awarded an Associate of Science in Civil Engineering Technology and a Bachelor of Science in Construction Technology. We took structural design classes in that program, part of which we took two classes at the same time, Strength of Materials and Materials testing. The second class acted as a lab for the first. As a semester project we were given four small pieces of lumber and were told to use them to make a beam we would test, then right a report on the test. It was expected the beams would fail when the load would push the beam past the maximum to bending moment it could handle. My group had the only beam that didn't fail due to bending, but it failed due to shear. Our beam was the only I-beam shape in the competition. One group made a beam that was larger in depth than all the rest, making it two pieces of lumber thick and tall. The other two groups made box beams. In theory, the I beam should have supported the most load before failing. The beam with the large depth supported the most load before failure, but it was pointed out that the depth would have been limited in actual practice. We were not permitted to cut the pieces of lumber, so the I-beam had on extra thick flange. Had we been able to cut that extra piece, we could have used it as stiffeners to help with that shear. That was a fun project and the most fun class I took in college.
I don't know what I love more... how excited the students get or how excited the teacher gets. This is how education should be done!!
Some students spread the weight over a wide area and some almost stack each weight upon another. Doesn’t that have an effect in terms of breaking? Thinking in terms of ice breaking when walking vs lying down on a latter ish’’’??? And pure luck that rotating force did not cost a broken toebone or two in the classroom. Should have some kind of steelnose attached to their shoes
Perhaps you know the bridge of SNP in Bratislava from building begun in 1967 - and completed in 1972 - can it still inspire ?
Why didn’t they have bigger basis.?
If the coloumn buckles at center then why do we provide steel lapping at center of coloumn
Lol Mark Zuckerbergs father
Bro, shut up
Lots of effort, then to SEE it work to failure. That IS the learning experience.
I wonder why didn’t they use disc-shaped weights only?? A lot of the failures happen because dumbbells are top heavy and fall on the side….not because structural failure
Great video, but I had a difficult time watching the weights fall on to the brick pavers, should have put a rubber mat down.
Catastrophic failure is part of iterative design. What would have been really interesting is what 2.0 and 3.0 would have looked like if all the projects were isolated from each other. AKA inter-school competition...
Solid thought!
I participated in the Alumni competition at the University of Houston model span contest. These were small balsa wood packages that you could only use what was in the package. Walter, very innovative transmission tower designer caused them to have to rewrite the rules. The new rule was: You can only use glue on the joints. Walter had sliced the wood into fine sheets and glued it back together. He created plywood with no weak ends and the dried glue was stronger than wood. Other things he did to walk away with the win: They could not prevent his best of all. He baked the model in the oven on low heat to dry the wood/glue. Everyone found out that kiln dried wood is much stronger than air dried wood. He sanded the shape to eliminate any excess weight. You have to consider shear in your wood design.
I liked the second design, it is the most functional and the simplest. 😮
Paul I'm a huge fan from Brazil. I teach structures for Architectural students and learn a lot from you.
Thanks!
Twister proof
This was pretty cool to watch. The elephant in the room as I see it though, is how the loads were applied to the models. Stacking the weights above the load carrying surface raises the center of gravity of the load and causes destabilization and rotational forces on the structures. Most failed because they were not stiff enough to handle the twisting forces, not because the structures broke. Loading below the working surface is stabilizing and reduces the rotational issues and focuses on the structures ability to carry the compressive and tensile loads. The last structure with the buckets significantly loaded gave it a major advantage over its competitors. To have a fair test, you should have all structures loaded with loads hanging from the same test rig that takes the loading mechanism out of the equation, and lets you evaluate the structures ability to carry a load. There was too much variability in the loading, as to how high the CG was, and how wide the load was spread across the working surface. I think the experiment did more to show how loading a structure effects it than the merits of the structures themselves. An extremely high CG can make a great structure look bad, while a large negative CG can make a poor structure look better than it is. I would love to see this done with the same structure loaded with the loads at varying CG's to show the effect of CG heights, and also the experiment done with a test rig that allowed the structures to be loaded at their designed load points, with a hanging load rig, so the structures can show how well they preform. Overall, this was a excellent experiment, even if the lessons learned may not have been the ones intended. I am sure that all involved had a great time.
Thanks Chris and I really appreciate the thoughts you put in your comment. Your points are valid and are certainly a good way to run a model test event. In my case, I prioritized students learning above anything else. So, to your point that the loading changed during testing, that's because the students in the class had already observed and learned about unstable models. If I'd continued load testing in the same way on the one hand it would be "fair" but, on the other, the students wouldn't learn anything new. I discussed this with them during the tests. They understood and were good natured enough that this might be less a direct rule-based competition only and something where each model would teach them something new...so, and here's the thing, that makes more of the students winners! (i.e. they learned more). And, again, thanks for your valid thoughts and for making them politely and clearly.
Very cool
Should build a bridge that could withstand a ship accidentally crashing into it…
I can do better with 5 boxes of honeycomb cereal
Im to broke for college
Don’t worry, that thumbnail doesn’t make you look like a #doucheFace #lemmingMoron 😂
Hey: I have been watching your video series on structures, and I would like to commend you on both the quality and content of these videos...really well done. In terms of trusses, which truss design do you favor for over all strength for uniform compression loads? Again, thank you for taking the time and effort to make the structure videos.
Should all have to use popsicle sticks or Something. Obviously the 2x4 can carry alot of weight. The problem is who build a big bridge out of one solid piece
You really should have let the first student make the weight spread out like all the others, it is underrated
Excellent presentation. As a teacher I compliment you on your presentation. A good teacher takes a complicated subject and explains it in an clear and easy manner that could be understood! Kudos!
Spaghetti has same flex coefficient as steel when scaled down to proportion
Kasabian? This universe needs to stop making me wanna read Helter Skelter
Excellent! Super fun learning. The only thing i would like to highlight in such activities is “Safety”. I see unfortunately no consideration to safety precautions in this exercise. Hope it will be addressed in future videos. Thanks
Heyy....do you have a video on how to make structural models of truss bridges?