How Cables Work - With Diagrams! (Structures 1-2)

Рет қаралды 16,269

Күн бұрын

Here we understand how cables work using diagrams! How they change shape with changing load, how that means we can understand the tension in the cable and where/how it changes.
I also go through how this relates to suspension bridge cables too!
This is a follow-on video from the one I did with a fun cable demonstration you can find here: • How Do Cables Work? (w...

Пікірлер: 41

@sambarlow3226 3 ай бұрын

great video, super clear, thank you!

@siangibby5771 2 жыл бұрын

I subscribed because of the "Funiculi', Funicula'" reference. Good work, all of it. Thanks for this great instruction.

@PaulKassabian 2 жыл бұрын

Awesome, thank you!

@wisternykesilva5582 2 жыл бұрын

this is channel is very very very good!

@roctrader 3 жыл бұрын

I like your teaching method Paul, very intuitive. You got a new subscriber, keep on this great work!

@PaulKassabian 3 жыл бұрын

Thanks! 15 years of teaching at MIT then Harvard...so something must be useful!

@xingchenghuang5324 2 жыл бұрын

Amazing structure intuition!

@nathanshields6585 2 жыл бұрын

These videos are well done! I love a good catenary

@PaulKassabian 2 жыл бұрын

Best. Thing. Ever.

@iceman7298 2 жыл бұрын

Brilliant!!

@anandjamdade9156 2 жыл бұрын

Excellent Sir

@user-hk6pj9qn2r 9 ай бұрын

amazing!!! thank you very much!!

@PaulKassabian 9 ай бұрын

You're welcome!

@gokulsatyasriram4614 3 жыл бұрын

I love it. I want much more content from you sir.

@PaulKassabian 2 жыл бұрын

new one just posted!

@gokulsatyasriram4614 2 жыл бұрын

@@PaulKassabian 😀😀😀

@johnjaccob6419 2 жыл бұрын

Keep going and thanks

@mohammadrezaranjbar2475 2 жыл бұрын

very good🤩

@TheEldho Жыл бұрын

Hi Paul, How do we calculate the tension on a catenary cable held between two points ? Adding another cable on top of the existing one, trying to figure out whether it is going to hold

@wisternykesilva5582 2 жыл бұрын

this is channel is very very very good1

@PaulKassabian Жыл бұрын

Thanks!

@engsan710 Жыл бұрын

Hi Paul, when do you have to consider the weight of the cabel?

@hadeelhabeeb3100 Жыл бұрын

hello mr Paul. can you help me to find the equation of the catenary curve when add e weight

@daultimateknight1539 Жыл бұрын

You helped me a lot :) may I use these diagrams? I would appreciate it if I could have a soft copy to use in my presentation

@PaulKassabian Жыл бұрын

Of course. They are from an iPhone/iPad app I used to have. I had help making them. I will be doing a video on them soon and, as part of that, I will include a link to all the images...so stay tuned!

@bouzoukistudent8180 2 жыл бұрын

are there any formula as to , and take the first examle here were we added a second string , if we take as a point o reference a vertical line passing thrught the middle of our weight , in what angle while increasing the span of the "hands" holding the line , the load ( tension) each hand is holding is equal as the tension when we holding the weight with one string ? i am guessing 45 degrees . but when we add a second or third or more loads the that said angle changed based the distance between loads ?( lets say that they are equaly destributed ) . Thank you !

@PaulKassabian 2 жыл бұрын

You're asking when the tension in a V-shaped string equals the force of a single central weight...for that it's 30degrees to the horizontal. Because half the vertical weight goes to each hand and sine(30)=0.5. For the rest, you just keep solving using basic trigonometry from the weights going up to the supports!

@belaczako1102 Жыл бұрын

High Paul. It's seems clear, that bridges deck is curved because of heat dilatation but how the cables can folow the deck when it shrink in cold? It looks to me that the deck, and the cable shrink in the oposite direction, wich leads to heavy tension. And which direction the support needs to handle forces in a suspension bridge?

@PaulKassabian Жыл бұрын

Good question, when the temperature reduces both the deck and cable shrink so it's not an opposite problem..due to geometry there are differences which are analyzed as temperature loadcases for all bridges. Thanks!

@hadeelhabeeb3100 Жыл бұрын

hello can you help me to find the equation when I add the weight

@SharlsRS 2 жыл бұрын

Im a little confused about how a free body diagram would be when the cable reaches the fully horizontal position while carrying a vertical load, as there is no vertical component to counterweight the downward load.

@PaulKassabian 2 жыл бұрын

Thanks for your note. With any vertical load (including self-weight from gravity) a cable cannot be perfectly horizontal. It may look like it (or essentially be so close as to be negligible) but there will always be some vertical displacement.

@errishavsingh3767 2 жыл бұрын

Hey Mr Paul Kassabian i am watching it from India 🇮🇳 but i wanna khow how Cable staying Extradosed cantilever bridge work...... would you please 🙏 make presentation upon it for me 😊.How should i connect with you sir?

@FoxRiverBridge 2 жыл бұрын

If only we had been shown this video while learning math in grade school

@rockapedra1130 2 жыл бұрын

Isn't it a catenary instead of a parabola?

@PaulKassabian 2 жыл бұрын

Thanks for your note. A catenary is the shape of a cable under its own weight (and nothing else), whereas a parabola is the shape of a cable under a constant horizontal load.

@hugbearsx4 2 жыл бұрын

@@PaulKassabian ... in a system where the weight of the cable itself is negligible compared to the external load that shapes it.

@hadeelhabeeb3100 Жыл бұрын

catenary curve

@archaeopteryx7405 Жыл бұрын

The shape of the cable is not a parabola; it is a catenary, a function of cosine hyperbolic.

@PaulKassabian Жыл бұрын

Thank you...a cable under its own weight is a cosine hyperbolic as you said...when point loads are added that are heavier than the cable then it becomes a parabola. The difference being how the the weight distributed: when it is along the curve of the cable itself it's a cosine hyperbolic ...whereas when the loads are distributed along the horizontal the shape becomes parabolic.

@archaeopteryx7405 Жыл бұрын

@@PaulKassabian thank you for the clarification. I found your videos are pretty interesting and instructive.