How Trusses Work! (Structures 5-1)

[@timclark7478]

this is what's great about KZbin, by accident you learn about something you've been observing but not really understand for years 👍

[@joeb4142]

The KZbin algorithm giveth and it taketh away.

[@glichasasha750]

If you think you can learn about trusses in 11 minutes you are delusional.

[@Delibro]

@@glichasasha750 Of cause you can learn something in 11 minutes. No one besides you thought you'd be a genius after this. And btw.: what need is there for you to pan someone? Just why?

[@glichasasha750]

@@Delibro of course you can learn *something* in 11 minutes. You can’t learn about trusses in 11 minutes. You are the absolute genius here. Read the reply first.

[@howitstartsmm]

First time viewer. Genius is the ability to teach a complicated subject clearly, simply and comprehend able to an average person. Thank you for your time and knowledge.

[@PaulKassabian]

Thanks!

[@rodrigovelasco5230]

Great explanation Paul. I am an architect, and these kind of clear explanations gelp not to exclude us from understanding structural behavior.

[@daved3494]

That was brilliant. I really liked how you developed this, logically, from a single tension and a single compression structure to a structure with multiple members. Thank you.

[@Flurib690]

Thank you so much for taking the time to make this video. I had a basic understanding of the loads involved in a truss, but some times had a hard time determining how the load was transferred through the structure. And it turns out because I was looking at it backwards. I would look at a bridge and try to figure out the load distribution by the weight of a truck sitting on it, not as the support structure resisting that load. I’m not sure if I explained that well, but your explanations helped a lot. What finally made it click, where I had that lightbulb eureka moment, was your graphics of the hands supporting the structure. I am very grateful for that, and again I appreciate you making these videos for everybody

[@PaulKassabian]

You're welcome!

[@jeremiahbarlow1924]

I have designed trusses at a wood truss manufacturing plant, but never understood this. The software just did if for me. Thank You for sharing.

[@BackToReality]

I'm less than two minutes in, but can already tell that I've just struck KZbin gold! New sub!

[@PaulKassabian]

Thanks!

[@robtristram8395]

What I learnt after a whole career in structural engineering is that most of the time no one really cares about getting even an efficient structure (unless it is the primary structure of something huge), let alone a theoretical optimum. The exception is design-and-build contractors where their profit margin depends on minimising materials, but of course they won't do that at the expense of complication, which costs "more than materials".

[@luiscobos123]

Is that in which country?

[@cameronlapp9306]

Also dependent on consistency of loading - no good to have an efficient design for only one use case. Efficiency of design presumes at some level a predictability of loading.

[@martingagnon4547]

One thing that pop in my head is when you build a truss on the ground and you use a crane to put it in place you have to consider that forces (tension and compression) will be the opposite way temporarily while moving it! Good video sir!

[@PaulKassabian]

Very good point!

[@kishfoo]

Thank you sir. Anyone with a PHD can explain physics to other well educated people. It takes a master to explain it well to us simpletons.

[@PaulKassabian]

Thanks!

[@dalegray934]

As part of my job, I have to record historic bridges, both automotive and railroad. I love watching your video showing how variations on the Warren and Pratt truss bridges work.

[@PaulKassabian]

Thank you very much!

[@samiashe1403]

Great presentation!

[@PaulKassabian]

thanks!

[@gaetanomontante5161]

Liked and subscribed. I am an engineer and having come across your channel by chance I found it to be be beautiful in the simplicity with which you explain things that in our days professors bored us to death with explanations of vectors and forces that in the end left us as ignorant as we were before. Thank you Paul and please continue the illuminating work. Hopefully some young blood will stick with your presentations and learn much from them, especially in the area of being opened to the enthusiasm of learning beautiful concepts.

[@PaulKassabian]

Thanks!

[@TRON0314]

Vid came up with the algorithm while I've been studying for my Architect exams and brushing up on my structures. Just excellent explanations! VERY helpful.

[@jimmimak]

I like how you teach visually, as it can be difficult going straight to maths without an intuitive understanding.

[@ShahroozAryan-ez7cc]

As a structural bridge engineer, I often watch your clips and thoroughly enjoy them. You demonstrate great creativity and innovation in your work. Particularly impressive was the clip featuring an arch structure built on a small scale model, where you deformed its shape by applying load with your finger. Additionally, the clip discussing trusses was captivating, especially when you introduced the optimized truss, with one part functioning as an arch and carrying compression loads, while the other part acted as a cable and carried tension loads. Overall, your work is truly amazing. Thank you for creating such incredibly beautiful clips.

[@PaulKassabian]

Thanks!

[@stevenkamp8001]

well explained, I think the magic in understanding it all ,is breaking it down into small thinking process blocks

[@ಬಸವರಾಜನುಚ್ಚಿನ]

So simple? No, it is made simple. A simple start, add elements one by one, understand each's role, comprehend the larger complecated picture. Very fine tutorial, that neither goes above head, nor allows to forget easily! Kudos.

[@jamieholtsclaw2305]

I liked his diagrams. They showed the magnitude and direction of forces in a way I could understand.

[@PaulKassabian]

Great!

[@csidun9087]

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!

[@flourishomotola5306]

This is the most brilliant explanation of trusses I have ever seen.

[@PaulKassabian]

Thanks!

[@cojoe4896]

I love just going out in the world and trying to understand things work and being able to just ask that question and get a video on it.

[@nikeshrathod7698]

Amazing explanation of TENSION & COMPRESSION using a PAPER!!!

[@kasirk7945]

The tutorial showed up when I needed it the most. God Bless you Sir.

[@CMRHM]

wow, you demonstrate the truss concept in step by step, this is very easy to understand and truly a clever method. Thanks!

[@PaulKassabian]

You're very welcome!

[@Uswesi1527]

Very basic knowledge that many people don’t know. Thanks

[@kushanimehta9325]

Just discovered this while taking a structures class, this is very helpful and easy to understand. Thankyou!

[@PaulKassabian]

You're welcome!

[@TheMDJ2000]

Nicely explained! Brings back my Statics lectures from a few decades ago. I might have to dig my textbook...

[@PaulKassabian]

Good idea, I'll wait...

[@nicolasramirez3944]

Paul this is such a concise and beautiful presentation! Your style works so well, like a great piece of music. Well done!

[@PaulKassabian]

Thanks!

[@dopenaidoo1359]

​@@PaulKassabian 0:50 0:59 0:59 0:59 0:59 1:00 1:00 1:00 1:00 1:01 confused right abt here, sir pls help

[@vesaltorabi9]

absolutely remarkable

[@PaulKassabian]

thanks!

[@lucianolizana446]

It's so intuitive and fun when explained like this !

[@PaulKassabian]

You're welcome!

[@503dude8]

Wow! The way I look at bridges is changed forever. I had to subscribe after watching this video. Thank you 👍

[@PaulKassabian]

Great to hear!

[@hugodesrosiers-plaisance3156]

I am a land surveyor currently doing my stage. I very much hope to work on a large world-class bridge at some point in my career. I have long loved bridges and considered them the greatest expression of Human engineering - because they link People together, they span gaps, they encourage exchange and cultural fluidity. The Ancient Roman Princeps was also the "Pontifex Maximus", the "Great Bridge-Builder". Spanning gaps is a Human fixation, it seems. There's so much glory in a great elegant bridge.

[@starskeymaid]

God bless a true educator! Paul just found your lessons when you trusses lesson came along my feed. I'm 47 big old goof who only took physics for dummies in college and nothing ever in high school. This is so very interesting and well presented. So very well done Paul, thank you. I can't wait to get to your other content. And watch this one on trusses again.

[@PaulKassabian]

Thanks and more to come!

[@Ehsan-k8l]

Me watching these videos so I can built better bridges in Poly Bridge 3.

[@ammarabid2077]

3:35 “you have to truss me on this”, well played

[@goldonon]

Thank you sir Very interesting especially the arches and cables you find in the efficient truss

[@burklander3338]

You explain in such a way that it is easy to understand, bravo!

[@bartvrhijn]

That part about the optimization of trusses spot on

[@PaulKassabian]

thanks - much appreciated!

[@Ennar]

Poly Bridge leaderboards, here I come!

[@jiojetigarea7176]

Love this video.... Well illustrated for the beginner...

[@PaulKassabian]

Glad to hear it!

[@raiderfandew]

I once made a small truss bridge for my daughter's cat. It was made of 1/4" x 3/4" pieces of white pine . Finished size was about 8 feet long and 6" x 6" square.. It was held together with hot melt glue. Imagine my surprise when we tested it's actual strength. It would hold two 90lb. bags of concrete!

[@bullfrogpondshop3179]

Nice use of West Point Bridge Designer! I used that with my middle school Technology Education students for many years.

[@gamadus]

Wonderful explanation made simple and elegant to understand 😊. Thank you paul

[@PaulKassabian]

Glad it was helpful!

[@beduino19502010]

UÁU !. Inglish Is not my original idiom, but, any way, I can say your class was realy wonderfool!!! ( from Argentina).

[@charlesbromberick4247]

Thanks for a truly excellent presenttion of the concept of tension/compression in trusses. If only the rest of the world could employ logic as well as you engineers....

[@PaulKassabian]

Thanks...and in this video I explain why all cafe tables, if designed by engineers, would have 3 legs not 4 and therefore not wobble! kzbin.info/www/bejne/goq5n2egqJecsK8

[@janninoenecio78]

best video so far for me, this is perfect for civil engineering students. more power to you sir thank you

[@PaulKassabian]

You are most welcome

[@milkrecu]

Beautifully explained and great outro music.

[@PaulKassabian]

Glad you liked it!

[@PratyushTewari]

10:40 ❤ “when you have a limited situation or something you can control, you are able to optimize more”

[@thecasualengineer99]

I know this is a late comment, but this explained it well, thanks Paul.

[@ongsengtikhak953]

I dropped out of engineering college because I couldn't understand or imagine in my head,this particular topic.. only if teacher like you could have changed everything.. again thank you for the upload 🙏

[@PaulKassabian]

You are most welcome!

[@dulcedelgado8594]

Great video with clear explanations!

[@dreamdream8942]

Genius teaching style. Take love from Bangladesh ❤️❤️

[@yemanemelkamu5682]

That is brilliant ,it instigates useful ideas that can be used in truss and tie model in the design of deep beams of reinforced concrete designs

[@PaulKassabian]

Glad it was helpful!

[@mujtabaahmadi7960]

I like the way you explain. I found your approach very logical and easy to follow.

[@PaulKassabian]

Thanks!

[@santo2269]

Hello Paul, I’ve been trying to find the right definition or rather the exact difference between a beam and a girder, I am a marine engineer so I deal with beams and girders on a daily basis, but I find them structurally very similar so it would be great if you could help me break down their fundamentals….. Thanks for the videos… keep them coming!

[@quarrydawg5424]

Beams and girders are not different, girders are just bigger. Girders are just beams that other beams frame into.

[@PaulKassabian]

Correct - they behave the same way under load...it's us that use words to describe them. quarrydawg is right that, for those who use them often, beams typically frame into girders and that relates to their use. Now let's talk about joists....

[@michaelyano6094]

Fantastic work! Thanks Paul!

[@ChrisHarding-lk3jj]

I wish I could of went to college and participated in programs like this. I had the absolute worst k-12 educational experience and the day I took the California high school proficiency exam was one of the happiest days of my life because I was done with school. I was bored out of my mind and my focus was on the clock counting down the time until I could go home. Who knows what I could of accomplished if I had the proper school environment. Unfortunately I have an eidetic memory so I can vividly remember every single day of school. I often wonder just how many people have similar experiences to myself. I did have one teacher who recognized my abilities and had my intelligence tested and was absolutely astonishing by my IQ score. That teacher attempted to understand how someone with my intelligence was a consistent D- student.

[@ArtworkAnon]

I’m so friggin pumped on this channel!!!❤❤❤

[@rodneytrotter1427]

These videos are great for helping me throughout my apprenticeship!

[@PaulKassabian]

Glad you like them!

[@michaelmacdonald2907]

Thank you for that. You bridged my understanding

[@fern8580]

3:12 the best explanation , ever, on youtube !

[@iliyakhramov4381]

Sophisticated and simple. That's brillian.

[@PaulKassabian]

Thanks!

[@pnyx7930]

Excellent Poly Bridge 2 tutorial.

[@PaulKassabian]

Correct - that's the only reason I made this video...

[@pnyx7930]

@@PaulKassabian It also happens to be a really informative and accessible video for those who want to learn more about structural engineering.

[@adventure-cowboy]

Fantastic video thank you for explaining all the physics behind each of the different kinds of geometry that was very helpful. I’m trying to learn how to build trusses in the house and this definitely answered my questions.

[@gamadus]

Wonderful explanation made simple and elegant to understand 😊. Tha k you paul

[@bftfcfua2946]

Good illistration technique

[@ColdWarVet607]

Making only one set of lines bend on the paper was the best magic trick I've ever seen, you should headline at Vegas! Just kidding, but it wasfantastic in its simplicity to show a complex idea as was the rest!!! Well done my firend.

[@PaulKassabian]

Vegas is the goal...

[@elektrolyte]

Structural Engineer: uses hi NOSE to point out something Me: EVEN MORE respect

[@faisalrasheed3616]

Brilliant way to explain the truss geometry... Thanks

[@PaulKassabian]

You are welcome!

[@bobvar72]

You are a great teacher! Nice job with this.

[@PaulKassabian]

Thanks!

[@KF1]

you had me at "I'm a structural engineer"

[@jimhagler3716]

A wonderful video, a beautiful explanation. thank you very, very much. I am not an engineer but I enjoyed this very much. I always wondered.

[@PaulKassabian]

Glad it was helpful!

[@ivandasty277]

Armenien people usually are very good in technical fields.You proved that they are also very good in teaching ! 👍

[@PaulKassabian]

Thanks for both!

[@RG-ru3ux]

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.

[@ssmith2019]

Nicely done ! Cheers !

[@HarshRajAlwaysfree]

this is actually pretty nice

[@Mitchd1337]

Great informative video.

[@mohammedjassim1360]

Great lesson thanks for this lecture

[@AlxGontijo]

Awesome explanation !!!

[@PaulKassabian]

Glad you liked it!

[@bouzoukistudent8180]

by mistake i finaly found a worthy channel .

[@md.ehteshamuddinkhan9741]

Had i seen your video 10 years back i would have never failed in Engineering Mathematics I dont blame my teacher but he gailed to explain what i couldn't ask why temsion amd compression in different sections eriginate

[@designstudio8013]

One odd think about trusses is compression in the strut is tension in the joint.

[@nimnogaparus]

Amazing teacher!

[@PaulKassabian]

Thank you! 😃

[@SheeneP]

좋은 영상 감사합니다 탁월한 전달력 최고네요

[@JonathanJournal]

love it!!! may i ask how do you simulate bridge tension and compression?

[@mateuszmostowski9546]

Truss him guys, he's an engineer!

[@ragas2845]

You ar an amazing teacher! Thanks for sharing your knowledge. I subscribed.

[@PaulKassabian]

Awesome, great to hear!

[@weavercattlecompany]

That last structure looked like a spider's web 😊

[@sanjayyadav-hj7dd]

fantastic video with concept, very easily explained

[@PaulKassabian]

Many thanks!

[@HorzaPanda]

This might actually help me finish all those bridge building games I own ^^"

[@planetaryutilities]

Thank you, simple and concise!

[@PaulKassabian]

You're welcome!

[@anandjamdade9156]

Great explanation Sir

[@PaulKassabian]

Thanks!

[@Micropterus06]

շնորհակալություն Paul!

[@PaulKassabian]

You're welcome!

[@X19-x5f]

This was a great explanation. Thanks!

[@nathanjames__]

I'm competing in a high school bridge building competition in which the bridges will be tested from a load at a specific point. The idea of optimizing the trusses is interesting to me, but how does one go about doing that for a given structure? Is it simply shortening compression members and lengthening tension members, or is there more to it?

[@billj5645]

For any given truss shape and loading, there will be a different amount of force in each member and some members will be in tension while some will be in compression. To optimize this truss you have to select each member to resist the force condition on it. If you want to optimize a truss and you have the ability to change the geometry you will want to make it as deep as you reasonably can and make the layout of web members fairly simple. But there are tradeoffs- as it gets deeper the web members in compression have to get heavier, as you space out the web members the chord members in compression can get heavier. So you may have to try different geometries and through trial and error you can come up with a geometry that is efficient. And please ignore the images shown after about 9:00 in the video. They may be numerically more efficient but they are not stable on their own without a lot of extra stuff and in fact the one at 9:49 is not a real truss and is not stable.

[@jessewoody5772]

Agreed, He did mention that it is only an exercise in development and not good with dynamic loads

[@smarternu]

I TICKED off my HS teacher. I did not build a truss, just back and forth cross members. I came in second. He couldn't understand it. I loaded the structure with 100 lbs after I glued each joint. I still laugh.

[@JohnnyArtPavlou]

@@smarternu Please say some more about your design. Did you laminate the back-and-forth crossmembers from smaller pieces Spirit or did you use pieces that were the length of the span?

[@smarternu]

@@JohnnyArtPavlou Lincoln logs. I used short and long (full span) pieces glued in place. Start with the longest member son the bottom. With each layer of glue/member I put books on top of the whole unit "pressing" it together with as much force as I thought it would take before breaking. The "glue pre-pressed" method cause it to transfer the load to all the members equally increasing the force required to break it. IMO, I got lucky. There was not a lot of thought or calculations.

[@AbdulHafeez-cq6oo]

Great description

[@PaulKassabian]

Thanks!

[@lshepherd5859]

now , i am a structural engineer !

[@llucruizesteve5949]

Soo good!!!!

[@PaulKassabian]

thanks! Do keep watching!

[@ffstructures]

Brilliant .. God bless You !