Foundation Pile Cap Design | Structural Engineering

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A quick tutorial on the design of a pile cap using beam theory and strut and tie method.
There isn't too much difference in the result but strut and tie has many uses in the design of concrete structures. It can allow you to solve complex problems by breaking it down into smaller problems to solve.
What I haven’t shown is the check for shear or punching shear. This will be an additional check and should be done using either method.
RC beam design tutorial - • Structural Concrete Be...
#strutandtie #foundationdesign #pilecapdesign
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Опубликовано:

30 июл 2024

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Комментарии : 65

@ICRPI 3 года назад

There's nothing like this on RU-vid. Thank you for providing such quality information. These quick overviews and pointers to where we can find more info to these common problems in the industry (UK in particular) are unbelievably valuable for Young Engineers. I haven't got much experience as a Stuctural Engineer (2 years) but the few projects I've been apart of, you've saved me a tonne of time and improved my efficiency. Thank you so much.

@EverydayDazz 3 года назад

Really appreciate the comment! Glad it’s helped you out and good luck with your career. If you got any questions feel free to get in touch. 🙂

@ponariwilliam 3 года назад

Thank you for the content. Simple and to the point.

@michaelyano6094 Год назад

Although I use a different codebook, the principles still apply. Your teaching style is excellent, clear and concise. Thank you!

@engrahmed7122 2 года назад

Simply beautiful. Cant praise enough. Thank you so much

@ezabala 2 года назад

Wow! Solid video. I'm glad I stumbled onto it. I'm subscribing right now.

@LKGAMER26 3 года назад

this is very informative, brillant video. thank you

@dragb6281 3 года назад

Confinement reinforced bars are needed to confine the compression strut or bursting in concrete is possible . That is quantifiable and presented as confinement bar going a few round at the pile cap circumference .

@umerbano9145 3 года назад

Thank you mate

@jcz8225 3 года назад

HOLA, desde Argentina, Me podrias moestrar un ejemplo identico a ese modelo, pero con un proceso inverso?, es decir, teniendo como datos, la cuantia del acero, para poder saber que carga "P" soporta la Viga de gran altura, saludos!!

@user-bt8xj2zw2g 11 месяцев назад

For a 1 pile group, for a 3 storey block work structure with ground beams (no point loads from columns etc), is it sufficient to have shear links at closer spacings around the pile or is there more to the reinforcement design here?

@yonggaz55 Год назад

thank you so much for this video, can i ask a question. where did you get the depth of pilecap?. thank you

@Er.SenthilGanapathi 3 года назад

Love from India brother ❤

@nadjagrbic9651 3 месяца назад

Hello :) How can I apply the strut and tie method if my column is under tension, given that I would have a TTT node at the top of the pile cap and a TTC node at the bottom. I guess the formulas for the nodes would be different, but where can I find them for that specific case and what else is important to know if the columm is under tension? Also, is the the shape of the triangle, i.e. the compression and tension lines, the same, or in the case of uplift forces, it is an inverted triangle, i.e. symmetrical in relation to the middle plane of the pile cap? Thanks in advance :)

@lamar2923 3 года назад

Thank you so much for your videos - very helpful for young graduates starting out in our careers as structural engineers. Could you do some videos on connection design in the future?

@EverydayDazz 3 года назад

Yeah it’s on my list to do 👍 thanks for the comment!

@Joker-oh3lb 2 года назад

Can't we use finite element analysis to figure out where's tension and where's compression?

@motasemsudani4257 Год назад

how did you get the area of the strut ?

@moharirshyamsunder4879 3 года назад

Can u share sir excel for this? Can we take actual size of pile as our strut size?

@CarbonTaxLOL Год назад

The standard I am using (AS3600, australia), wants me to design a strut as: phi*beta*0.9*fc*Ac phi and beta are efficiency factors (0.65, 1) the Ac is the "smallest cross-sectional area of the concrete strut at any point along its length and measured normal to the line of action of the strut" How would I calculate this area, if my column was 600x300 (also Diameter of my piles was 600). I assume it is the area of the triangle you drew at 3:47, however this would yield Ac=45000mm2 thus the design strength of the strut would be 547560? seems quite wrong.

@neco0017 2 месяца назад

I have 2 rows of 4 piles. Can I still use the same method?

@georgesmith6399 2 года назад

Great video! Would I be right in assuming that the only difference for a pile cap with a moment applied, or an eccentric load would be that the reactions from the piles would not be equal?

@EverydayDazz 2 года назад

Your tension reinforcement would need to cater for the bending moment as well as the tension due to axial loads.

@dipendranathbhowmick6577 Год назад

But, I have a question, is it not angle of strut is tan [inv (1300/900)] = 55.3 degree. Accordingly, the calculations may change.... I think it is the angle of strut with the horizontal. Please correct me if I am wrong.

@LKGAMER26 3 года назад

please do a punching shear check which need links around,

@AO-fg7mo 3 года назад

First of all, I would like to thank you for the content that your share in RU-vid. I got confuse about how you got the width of the strut (500mm/2), where did you get the 500mm from? it was a little bit fast and couldn't get it? Could you please explain this small part? Kind regards and keep it going :)

@EverydayDazz 3 года назад

I believe the strut width used was half the column width. Thanks for the comment :)

@DJayDNA 2 года назад

This is amazing. Thank you so much for your videos - highly appreciated and valuable! I wonder how would you design a 1-pile foundation? Is there a certain way? I need to have 1 (and 2) pile foundations in my current project but I realised that there is hardly any information regarding the design of 1-pile foundations.

@EverydayDazz 2 года назад

Hey there, you’re welcome! There isn’t much to design for single pile caps and normally single piles are for piled ground beams. In that case the ground beam would be supporting load bearing walls instead of isolated columns. I have done a video on piled ground beams if you’re interested

@DJayDNA 2 года назад

@@EverydayDazz thank you for your reply. Is it because the load from the column is assumed to go straight to the pile? But you'd still need to check the foundation for shear, correct? Also, if you'd only have a couple of columns that needs a piled foundation, how would you solve that problem? Do you design a piled ground beam and use the dimensions (HxW) you are given? Apologies for multiple questions but I really haven't been able to find any answers.

@EverydayDazz 2 года назад

If a pile is supporting just a single column, then there is little to no shear or bending. The main thing you’d need to design is to make sure the pile cap doesn’t burst under axial loads so you need to design the pile cap for that. But generally, you rarely see just single pile caps on there own as you need to restrain piles in two directions. Similar to that of a column. It’s quite hard to explain with just text 😂

@mottscottison6943 2 года назад

Question, do you still need to check for shear? I've seen people still check for shear but I personally feel that since all forces has been converted and checked as compressive and tension forces, there are no shear forces. The same reason you don't check shear for truss members. Maybe perimeter punching at the column is still relevant? But again, you have resolved the stresses at the nodes, so why shear check? Kindly advise.

@EverydayDazz 2 года назад

Yes you still need to check shear for sure. Shear design in concrete is actually a form of strut and tie.

@mottscottison6943 2 года назад

@@EverydayDazz food for thought, like you said, shear is basically a strut and tie. If you were to remove all the other parts of the concrete and left with the triangular truss, where is the shear force? Forces has been resolved through the strut and tie. But i agree better check with the shear method too to be conservative.

@heavypackbackpacker631 Год назад

@@mottscottison6943 I agree - usually designing with STM precludes shear checks for the reasons you stated.

@TheeModerateGamer 2 года назад

Hi, would this method still apply to a 6 piled pile cap with the centre column acting on the centre of the pile cap? This is such a great video, I was unsure about the strut-and-tie method and unfortunately EC is not the best for explanations, as you probs already know! haha

@EverydayDazz 2 года назад

Strut and tie has many applications. And yes it can be used for 6 pile caps

@TheeModerateGamer 2 года назад

@@EverydayDazz wow thank you for getting back to me so quickly! Was not expecting that! So with regards to the method, would I create 3 sets of the strut-and-tie system, that is supported by 2 piles. Or 2 sets of the system supported by 3 piles? With regards to the beam method: Would there be 3 identical, single spanning, beams that are modelled? Thank you so much in advance 🙏🏾

@jasonRhawt 3 года назад

Is it possible to do your foundation on shallow water into bedrock? Where top surface to water is around 1-2ft?

@EverydayDazz 3 года назад

is this to check for water uplift?

@jasonRhawt 3 года назад

@@EverydayDazz yeah

@jeffchia4 3 года назад

How would you know that the pile cap wouldn't act like a beam in reality (which required more steel reinforcement) instead of struct and tie? Thanks!

@EverydayDazz 3 года назад

Hard to answer, mainly because I don’t know the answer! I think due to the fact that the pile cap isn’t very long, it can behave so that strut and tie works. If the distance between the piles was longer than it would be hard to justify using strut and tie and you would want to design it as a normal beam. It is why you can you use strut and tie for deep beams.

@callanward9344 2 года назад

Most codes have span to depth guidances

@CarbonTaxLOL Год назад

what software are you using to draw those lines that automatically straighten?

@EverydayDazz Год назад

Goodnotes 5 on iPad

@LvPatriot1 3 года назад

Hi, can you please do also a Raft foundation design tutorial, thanks in advance.

@EverydayDazz 3 года назад

It’s on the list don’t worry :)

@LvPatriot1 3 года назад

@@EverydayDazz Thanks a lot.

@lkj17 2 года назад

If u do this. Do you still need to do a shear check

@EverydayDazz 2 года назад

Yes you should carry out a shear check as well especially if the pile cap is shallow. I would do a beam shear check as well as a punching shear check.

@lkj17 2 года назад

@@EverydayDazz make sense, i got reversing loads to check S&T a 20m cantilevered pump LOL little more complex than the gravity column pile cap

@musamahomed 2 года назад

Is there a design for 1 pile group?

@EverydayDazz 2 года назад

There’s not much to design but you would typically use single piles in regular spacing in a ground beam.

@kienmaitrung5476 Год назад

Hello, I am a 3rd year student currently studying at a university in Vietnam. Thank you for sharing interesting knowledge. Can you give me some documents on how to calculate transfer beams?

@EverydayDazz Год назад

Same as designing any normal beam except your serviceability criteria needs to be controlled.

@edg4246 5 месяцев назад

4:10 - where did you get "0.4" from? Shouldn`t you have "0.57" there?

@EverydayDazz 5 месяцев назад

0.6 x fck /1.5. 1.5 is the safety factor for concrete to get fcd. 0.6/1.5 = 0.4

@cats6184 5 месяцев назад

@@EverydayDazz thanks 👍

@user-rc6po3ng6x 5 месяцев назад

@adamsicmundus3566 10 месяцев назад

you lost me when you were calculating the width of the strut.. where does your triangle come from? where does the 500 from the 500/2 on the top of the triangle come from? isn't the strut the dashed line that makes the 34.7* with the vertical line? so why are we calculating the length of the diagonal line from that "imaginary" triangle