Pad Footing Design

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Pad Footing Design - Part 1

Рет қаралды 15,013

BEng The Brazilian Engineer in Australia

Күн бұрын

In this video I'll go over the theory behind the design of pad footings. I'll touch upon development length, lap length, cogs, bending moment, one-way shear, punching shear and much more.
In Part 2 of these series of videos I'll go through an actual example to make things more clear.
Let me know in the comments if this videos was useful to you :)
Inside this video, I'll cover:
1. Introduction (00:00)
2. Pad footing behavior and reinforcement details (00:28)
3. Development and lap length (02:08)
4. Critical section (05:12)
5. Pressure distribution (05:55)
6. Axial load and bending moment (06:51)
7. Middle third rule (08:53)
8. Determining the size of the pad ( 09:45)
9. Design for Bending (10:18)
10. Design for one-way shear (11:50)
11. Design for punching shear (12:43)
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Пікірлер: 50

@TheSameer37 3 жыл бұрын

Good to introduce the basics!

@bengthebrazilianengineerinAus 3 жыл бұрын

Thanks for watching mate

@aralox18 2 жыл бұрын

Really good man. I've watched this and part 2 a bunch of times and I absorb a little more each time. Thanks for doing these videos. Recommendation: include screenshots of more tables from the standards docs (AS3600 for these footing videos). It would really help those of us without access to the standards, so we can try out other calculations. Thanks again, keep up the great work.

@bengthebrazilianengineerinAus 2 жыл бұрын

Thanks mate. Glad your getting some value out of these videos. Appreciate the recommendation. Will do for sure. Cheers

@malapris1283 Жыл бұрын

I have been watching your videos and still watching them repeatedly. Structural Engineering courses are very tough in uni and I am very happy I subscribed to your channel. These videos are very informative and have kept on reminding me of my uni lessons and also exposed me to some new knowledges as well. Keep them coming brother! I wish you a blessed week!

@bengthebrazilianengineerinAus Жыл бұрын

Thanks my friend. Glad the videos are helping you at Uni. Appreciate your support. Cheers

@lucasfortunato7833 3 жыл бұрын

Ótimo vídeo meu irmão!!!

@sx2000 2 жыл бұрын

Thank you. I subscribed. More Vid's please!

@bengthebrazilianengineerinAus 2 жыл бұрын

Thanks for the sub!

@legoboy1357911 3 жыл бұрын

It really helped me understand what I have read in books. You explained it really well! Will you also be doing something with the other stability checks? Like overturning and sliding?

@bengthebrazilianengineerinAus 3 жыл бұрын

I may be doing these checks when designing a retaining wall in the future

@engineerahmed7248 3 жыл бұрын

At 5:50 where did u lookup to get critical section location

@gnidnoeled786 Жыл бұрын

Footing size / area is calculated based on service loads (unfactored), innit? So, in order to find out if allowable soil pressure is satisfied, is it, allowable soil bearing capacity be greater than the sum of (soil net pressure due to column load) + (unit weight of soil above footing X height) + (unit weight of concrete footing X thickness of footing)?

@bengthebrazilianengineerinAus Жыл бұрын

Geotech engineer will give you an allowable bearing capacity of soil. This capcity has to be greater than the applied pressure. Yes self weight should be accounted for.

@gnidnoeled786 Жыл бұрын

@@bengthebrazilianengineerinAus Thanks for the reply. Your videos are not only interesting but worth-watching as well. Hope you continue making contents to share your expertise.

@mohammedwaseem3739 Жыл бұрын

I wanna work for you. Or as an intern. Really appreciate the work you are doing. Helping young engineers.

@bengthebrazilianengineerinAus Жыл бұрын

Hi Mohammed, maybe one day when I build my own business :) Thanks for the support

@aymanraouf1820 11 ай бұрын

i noticed in certain grounds they use isolated pad footings, and in other grounds they just do a slab on grade. Why does this occur? For the first scenario, it consists of a concrete masonry unit large house. Do you have any reading recommendations on books about this?

@bengthebrazilianengineerinAus 10 ай бұрын

If it consists of continuous load bearing walls, you won't use pad footings. Pad footings are good for isolated point loads, but they are more susceptible to settlement or differential movements. I would choose the footings based on loads and type of soil. I think you're referring to a mat foundation, which is sort of a slab on ground and it is useful when the soil is weak. Imagine it as a large pad footing supporting the whole building. There are lots of resources out there. Where are you based?

@khalifaalnaamany9330 2 ай бұрын

Hello I am not a civil engineer , I m trying to build a car garage with a swimming pool on top of the garage , the garage is 10m x 6m garage with a swimming pool of 8m x 5m and 1.5m depth with six footing and pillars, what size of footing should I use to be on the safe size, thank you

@bengthebrazilianengineerinAus 2 ай бұрын

Don't build that without a professional structural engineer advice. There's much more involved. You have to know the soil properties etc

@paulmwangi5061 8 ай бұрын

Sir talk sth a bout raft footing,thanks

@gnidnoeled786 2 жыл бұрын

Is column selfweight shall be added to N dead load then multiplied by 1.2?

@bengthebrazilianengineerinAus 2 жыл бұрын

You should always include the self-weight of the structure. For ULS you multiply by 1.2

@jamesy9568 3 жыл бұрын

Hi, could you let me know how to find the Ast formula. I have checked AS3600 but cannot find it. And how to use this formula? Cheers

@bengthebrazilianengineerinAus 3 жыл бұрын

Hi James.. I got this formula from the book Reinforced Concrete the Designers Handbook. If you google you will find it as well. It's just an approximation of the Ast you would get by going through the whole process of beam design.

@nematquadri8881 3 жыл бұрын

I'm 1000th subscriber

@bengthebrazilianengineerinAus 3 жыл бұрын

yeahh haha Thanks Sahil

@aymanraouf1820 3 жыл бұрын

Excellent video! When is the second video getting posted??

@bengthebrazilianengineerinAus 3 жыл бұрын

I don't have a specific date yet sorry. Been really busy at work recently.

@aymanraouf1820 3 жыл бұрын

@@bengthebrazilianengineerinAus Excellent work nevertheless. I ve worked on field and believe me its not easy to find design being explained so clearly like this. I appreciate all the work you are doing.

@bengthebrazilianengineerinAus 3 жыл бұрын

@@aymanraouf1820 Thanks for the compliment. Appreciate your support

@frederiktoldevarjrgensen6730 2 ай бұрын

Hi. Should the Z not be Z= Bt^2/6 where t is the depth of the footing?

@bengthebrazilianengineerinAus 2 ай бұрын

Hi Frederik, Look at the bending moment direction. Now imagine a vertical beam going into the soil. The length of that beam is the depth "t". And the sides B and L are the dimensions to find Z. I'll probably have to get chatgpt to refine this answer haha but if you didn't get it, have a look at some books and compare to my video. Let me know how you go

@frederiktoldevarjrgensen6730 2 ай бұрын

@@bengthebrazilianengineerinAus Thank you! it makes sense to me now 👍

@bengthebrazilianengineerinAus 2 ай бұрын

@@frederiktoldevarjrgensen6730 happy to help

@titusshilongo7710 2 жыл бұрын

Hi Man,I am subscribed and your content is gold,Please keep making more videos becuase your content is quite unique,Is there anyway to reach out to you?

@bengthebrazilianengineerinAus 2 жыл бұрын

Thanks Titus. Appreciate the support. My email is eear.gabriel@gmail.com I answer on instagram and linkedin as well

@shixiao6786 3 жыл бұрын

bro what is the software in your background monitor？

@bengthebrazilianengineerinAus 3 жыл бұрын

That's just a power point image. :D

@gnidnoeled786 2 жыл бұрын

Are footings never will be doubly reinforced? If yes, why?

@bengthebrazilianengineerinAus 2 жыл бұрын

They can have top and bottom reinforcement depending on the actions imposed. A good example of one would be a strap footing. I have a video on Offset columns/Eccentric footings that showcase that.

@gnidnoeled786 Жыл бұрын

@@bengthebrazilianengineerinAus Many thanks, mate.