Design LASTING Concrete Post Footings - By Professional Engineer

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Design LASTING Concrete Post Footings - By Professional Engineer

Рет қаралды 6,462

Күн бұрын

Learn from a professional engineer about common footing mistakes, and what can be found in the IBC and ACSE code books about the sizing and thickness of concrete footings. This video covers a broad range of topics centered around sizing footings and how to determine if your ground is solid enough to hold them up! If you are building anything that requires a concrete footing, including something as simple as a deck, this is a good information video just for you! Its time to design LASTING concrete post footings for ALL projects!
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Disclaimers: Richard Racz, P.E. does not hold the title "structural engineer". Any claim of it in the videos or descriptions is unintentional and is superseded by the title "civil engineer" in the states of MA and OR.
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#fence #footing #kestavaengineering

Пікірлер: 34

@dylanbolton6297 2 жыл бұрын

You're the man. I was just designing one of these the other day actually and was wondering why enercalc was spitting out some lower values than what I was achieving and you helped me out. Thanks for doing these you can never get enough good vids and pictures in engineering!

@Kestava_Engineering 2 жыл бұрын

Thanks for stopping in Dylan! I know it was a longer video but wanted to capture it all!

@maciejcichy6018 5 ай бұрын

Thank you for explaining these formulas, as I couldn’t get my head around it. For the force height for a fence without gap, shouldn’t the force be applied at 0,05h above the geometric center, as shown on section diagram and described in ASCE. (load at 0.5h + 0.05h = 3.85f, not at 0,5h = 3.5f).

@habitually_holistic 2 жыл бұрын

im gunna get my boyfriend to build our deck now! thank you for this!

@Kestava_Engineering 2 жыл бұрын

sounds exciting!

@FB-bf1ww 3 ай бұрын

Nice video, thanks!

@sudqiamad958 2 жыл бұрын

Hi Kestava, Thank you for the good design example video, very informative but is done much faster than what one would be solving in the real exam environment, for you jump fast between manuals and many pages/tables. The question I have is WHY and While you have selected the Wind Load value of 06W but you have not considered the Dead Load value when you used the Allowable Stress Design. Doesn't the DL count here in resisting the wind load?

@Kestava_Engineering 2 жыл бұрын

Hi Sudqi - I agree that this problem (in depth) would not be something to expect of the PE exam. A form of this problem suitable for the PE may be that you need to size an effective footing and they give you the wind pressure already. You absolutely can take your DL into consideration when resisting your overturning forces, but in this case the DL is very very small because it is only a wood fence, so i just ignored it.

@jeffreymiller8663 4 ай бұрын

Excellent content. Thank you.

@Kestava_Engineering 4 ай бұрын

You're very welcome!

@jamesjenkins5251 Жыл бұрын

I love this video from an IBC and ASCE stand point. Your videos are truly amazing. My concern is with the typical “butting heads” of engineers and contractors. In the “real world”, if I tell a contractor that his fence post holes need to be 18”x54” I am going to get socked in the face! Just saying. Also, when we do not have a geotechnical report, is there a “default” soil/site class to select in order to get that “S” value?

@Kestava_Engineering Жыл бұрын

totally agree James! good engineers should always be straight with the contractor with things that "could" be designed by an engineer and things that "have" to be designed by an engineer. we are bound by the code, so as soon as a contractor says to design and stamp something we cant just say its OK because thats how its always done. we have to prove it with calcs and the code. Yes there are default conservative values in the IBC that can be used!

@simplyrelaxedvideos Жыл бұрын

Had my contractor listened to me, my fence would not have come down. He buried the footings at barely 2ft. Do these calculations remain the same whether the post is fully buried in concrete or if using a post suppost that is partially buried in the footing?

@joeyfalcon3278 8 ай бұрын

With footings, you are receiving the resistance through your soil pressure acting along the concrete footing. With that being said, the depth of the footing is ultimately what controls the strength of your post. Whether you put the timber post all the way or partially into the concrete, that won't have too big of an impact as the soil is acting against the concrete. However, it may be beneficial to have some decent embedment of your wooden post into the concrete. This is my take on the subject and I may not be 100% correct. Thanks.

@jackyeh7512 Жыл бұрын

Good work!

@Kestava_Engineering Жыл бұрын

Thanks!

@erickguillen9535 Жыл бұрын

What would my P be for a picket fence with a load case of 41 psf, spaced 5 ft on center? Pickets are 1” wide and posts at footing locations are 3” wide. Having trouble with the tributary area calculations for a picket fence setup. Post is set to be 8’ high. Thanks!

@Kestava_Engineering Жыл бұрын

you can conservatively run your calcs assuming the wall is solid - try that first to simplify your tributary area! let me know how it goes

@enasalmanaseer1489 2 жыл бұрын

Wonderful!

@Kestava_Engineering 2 жыл бұрын

thanks ENAS! loving that black kestava badge BTW!

@LoquendoProxy Жыл бұрын

Does this work if I'm embedding a pergola too? Would it be necessary for me to get some kind of rebar inside this type of piles?

@Kestava_Engineering Жыл бұрын

pergola's have a large uplift force on them due to wind loading. you will most likely have higher loads that you need to design your footing for and rebar would be required to meet code minimums and provide development of the anchor bolts further into the footing (if required). but these are things an engineer needs to consider if they are designing the footing for you. the pergola manufacturer may provide prescriptive footing sizes that a contractor (or you!) can build. I hope this helps!

@LoquendoProxy Жыл бұрын

@@Kestava_Engineering Thank you! I'm a big fan of your content and I've learnt a lot with your vids, keep up the good work!☺

@cretziscrazy 2 жыл бұрын

amazing

@hughlee7107 2 жыл бұрын

If I buy you a Geronimo Poster will you hang it up? P.S your videos are mind gold

@Kestava_Engineering 2 жыл бұрын

OMG Hugh I would hang it up ASAP! and thanks for the compliment!

@danielstoesser341 2 жыл бұрын

Isnt max moment (w*l^2)/8? I believe (w*l^2)/2 is for max shear of an evenly distributed load.

@olansen 2 жыл бұрын

wl^2/2 is the maximum moment for a cantilevered beam

@dylanbolton6297 2 жыл бұрын

Daniel you are thinking of a simply supported beam max moment possibly and the big difference there aside from the support conditions is that the max moment in ur case is located in the beam while this condition the Max moment is all shot into the fixed support. Hope this helps for some food for thought!

@Kestava_Engineering 2 жыл бұрын

Bingo

@Kestava_Engineering 2 жыл бұрын

Jackson you da man

@kenmackenzie4398 Жыл бұрын

From a practical perspective, 18" diameter post footings would be impractical and uneconomical for a fence. Something is amiss, this doesn't pass this 'what is done in reality' test. Usually fence post hole augers are 6" or 8" diameter

@TheModelmaker123 Жыл бұрын

Yes, agree. From the aftermath of a few hurricanes it seems the typical metal fence post installed as you indicated are bent over with some missing segments, and the wooden post (not rotted and originally backfilled with concrete) are left standing but without many of the fence segments attached. I guess this is a good example to use when designing non traditional items such as signs where stamped calculations are necessary and liability is involved.

@Kestava_Engineering Жыл бұрын

right on the money @themodelmaker123. it all comes down to an (engineered) design vs what you decide is best for you. engineers are bound by the building codes and material codes adopted by the local authority and we must uphold them if designing stamped engineering documents. the loading criteria we need to meet is (most of the time) significantly higher than people would expect, especially for residential type work. fences are a common item that engineers avoid designing because they end up having to spec footings that are much larger than is expected, but they cant justify through calculations or code to make them smaller. :(