I just recently was introduced to the L/6 concept, and this set it in stone. Thanks for video!

@Kestava_Engineering

Жыл бұрын

Hope you enjoy it!

It is worth mentioning, that for real-world design examples, the e > L/6 case, which introduces tension (uplift) in the footing is prohibited by code (i.e. AASHTO) and typically not allowed by most local municipalities.

Great job on explaining the behavior of the soil carrying the foundation when the load's location changes in relation to the foundation's size! I am doing my construction exam next week and I just watched your 5 tips video too. Keep up the good work!

@Kestava_Engineering

3 жыл бұрын

thanks Najwan! good luck with your exam, you got this!

Very helpful. Was studying for PE and had difficulty understanding the cases but you explained it so well as it’s clear for me. Thanks again.

@Kestava_Engineering

3 жыл бұрын

Glad it helped!

There was a very similar if not identical one on the PE I took last time and I answered "intuitively". I immediately eliminated A & B because in my mind those are such skinny footers compared to the ones we design everyday for much smaller loaded two story residential homes. Oh well, at least I know now how to answer even though it doesn't make sense yet. Thanks

@Kestava_Engineering

3 жыл бұрын

Matt I hear you my man. that type of footing size would look funny in typical construction documents. ESPECIALLY with the loads stated. The kicker is that the allowable soil bearing pressure is crazy high. I think this was an error in the problem given. I know we didn't use it but I believe it should read 3000psf no 3000psi. and in that case the footing would need to be 10ft just to support the gravity loads!

Thank you for this video!!!!!

shall we consider ASD loads only? also, should we use all loads (dl,ll, seimic, wind) when calculating eccentricity? what about load combinations, shall we apply them when calculating eccentricity?

Great video and great explanation. I would love your recommendation for a foundation design book for Engineers. I work in the power industry. Thanks

This was so helpful!!!

@Kestava_Engineering

3 жыл бұрын

Im glad to hear that Maggie! I just uploaded a video for my top 5 tips for the PE exam.Hope they help!

I just started checking for the soil capacity assuming there is no uplift and kept getting very small numbers!

How would you go about changing the unwanted state to a more desirable one?

Are there any calculations/ examples for bracing design on a 10’ high foundation wall, 1’ thick 3000 PSI concrete? Forms are 2x4 on 18mm phenolic film plyform/ hdo (supposedly) need to know how much bracing/ what the answer would be for “effective” bracing/ support - 8 inches apart, 12 inches apart etc

Great thank, it was help me for PE structural

@Kestava_Engineering

2 жыл бұрын

Glad it helped!

What about footing dead load? That value is not negligible: Wc=150 (pcf) x L (ft) x 6 (ft) x H (ft).

Which reference manuals have the eccentricity equations? For the 2022 CBT Structural Exam, I can't find it in any of the provided references, and it is not in the NCEES Civil Reference Manual. Thanks!

The Max. stress produces with that length (L=1.7 ft) is equal to 35,294 psf, which is much greater than the allowable soil stress (3,000 psf). Could you please explain it?

question: if we use the max allowabe soil pressure given in the problem statement for the equation qmax = P/A(1+6*e/L) because we want e = L/6. Knowing qmax = 3 psf, P = 180 kip, A = 6 ft*L, and e = .278, can we also use this to solve for/check L? But I get weird numbers so not sure if I am right...

@reza1001us

2 ай бұрын

You are right. He solved the problem mistakenly. The true answer is what you have done. Actually, the true answer is: L, min = 11.45'

Where are Kern limits mentioned in the PE Civil Reference Handbook?

Are we assuming all the loads are at service level? Also, do we not need to check the foundation for different load combinations, like D+0.6W, D+0.75L+0.45W, 0.6D+0.6W?

@Kestava_Engineering

2 жыл бұрын

Hi Bikal - thats a great point. alot of the PE exam practice probelsm dont make it clear whether to include load combos or not. in real life I would absolutely agree that load combinations need to be used in the design of your footing and multiple load combo cases would need to be checked!

@bishalpokharel5360

2 жыл бұрын

I had same question.

What code has kerns limit?

@Kestava_Engineering

2 жыл бұрын

you know I don't specifically know if a code covers the kern ratio, I've just understood that if your resultant moves outside the kern then the entire surface of your footing no longer is in compression. I'll have to look into that Victor!

@FB-bf1ww

Жыл бұрын

@@Kestava_Engineering Blodgett talks about it in column design, I think he uses "D", but not sure for codes

allowable soil pressure is 3000 psi? Should be 3000 psf

@Kestava_Engineering

Жыл бұрын

very good point! I didnt even notice that mistake in the problem. and apparently the practice problem didnt either! your absolutely correct - PSF

@dontransue9843

Жыл бұрын

@@Kestava_Engineering hey, Im watching now and am impressed. Im 53, Michigan State engineering/U of Colorado Denver MS; licensed now in 24 states. young engineers ask me all the time about those type of units where they say lbf; its a custum in the west; lbft/sf. I have to take the IL SE next yr. talk soon

Why the name 'Kestävä'?

@Kestava_Engineering

3 жыл бұрын

My ultimate goal is to change the residential sector of the building industry with home designs and proper engineering that can last much more than a lifetime. A big part of my passion is also in sustainable design and building practices. I have a huge admiration for Scandinavian / Nordic / Swiss timber design and wanted to point homage towards that. So Kestava means "sustainable" in Finnish. So ultimately kestava engineering is "sustainable engineering" Its early and we as a TEAM are just solidifying the basics of real world engineering on this channel, but my hope is that we one day make sure each engineering decision we make has a sustainable impact on the world, in order to conserve for our future world / worlds.

@tatjoni

3 жыл бұрын

@@Kestava_Engineering Awesome! The reason I asked is I'm a structural engineer from Finland and for the moment I thought, that there's some sort of new translation algorithm in YT 😆 I wish you all the best. And don't hesitate to contact me if you ever need any assistance for example finding our local literature for something.

@Kestava_Engineering

3 жыл бұрын

@@tatjoni thank you so much! that's an awesome thing to offer! I will be sure to keep in touch.