Secrets of Reinforcement | How to design reinforced concrete

Reinforced concrete is an essential tool in modern construction. This is made by combining reinforcement and concrete. The reinforcement can be made of many different materials; however, the material must have a high tensile strength and also be stiff. Concrete is an outstanding material to resist compression, fire, and outside chemicals but it is weak in tension. This is why these two materials are so important together. The video gives the history of reinforced concrete and also explains how reinforcement is conceptually designed in reinforced concrete. This will be useful to designers and also contractors.
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A huge thanks to Hailey Goodale, my director of awesome, for editing this video.

[@qambi1]

This bloke really reinforced his point at the end of the video. Thanks mate

[@kodyarquette1368]

Hey Tyler. I’m a reinforcing rod worker apprentice that just recently finished my level one training. We’ve watched most of your videos in class and they really helped us out a lot .

[@fredericrike5974]

France during that period produced a number of exceptional thinkers and tinkers- Darcy's theories and formulas re how water (fluids) move through various densities of strata is still big when planning both water and oil wells. It was the industrial revolution and it's needs that were really receptive to new ideas. Bravo for shining a little more light on those tinkers and thinkers!FR

[@TylerLey]

Thanks for pointing that out. So many great scientists and inventors from France.

[@fredericrike5974]

@@TylerLey It was a great time for "critical thinkers" - the thresh hold of the Industrial Revolution. In America, Fulton and a host of others changed farming and laid the ground works for the greatest manufacturing boom ever- Henry Ford, the Wright Bros couldn't have happened with all that happened all over the world from about 1750 to 1900. Man's reach would finally be something he could actually see. You are the guy that spent the time and got the degree- and then applied the bejabbers out of it! Me, I'm an over educated plumber, with a jones for the history of my own profession and the ones around it. I can retell stories about others who did big things- you, my friend are very likely to push into something no one ever foresaw! Good Hunting!FR

[@JRCme1]

This is the first construction video that moved me to tears and calmed my fears!

[@TylerLey]

Thanks so much!

[@phillippachigariro2250]

Great engineering tips but brokendown in simple lay man language

[@leosalonggat6579]

Me too 💯❤️

[@soldieroffaith4425]

Tear jerking video. Great information. My eyes are moist.

[@spanky9067]

Thank you for making me a concrete freak too! I will be building a home in the Philippines and I have been studying SRC and many other aspects of civil engineering so I may be certain my home is built strong and safe. I have learned so much from you and your colleagues.

[@TylerLey]

Thanks so much!

[@grizzlygrizzle]

Be sure to study the techniques for making earthquake-safe concrete buildings. They have lots of earthquakes in the Philippines. Take a look at a map of the fault lines under the Philippines. Yikes! Also typhoons and flash floods. Pay attention to the elevation of your site, and to techniques for keeping your roof on in high winds. Maybe Tyler would be kind enough to make a video on planning a concrete building in such a high-risk area.

[@dannycbe949]

I am 60 year old structural engineer...my teachers never had this kind of passion ... Thanks. 👍

[@Richard-ez6nf]

Of course not , they just go home

[@zerg9523]

Another terrific video, enjoyed from the UK, thanks prof Ley.

[@TylerLey]

I am so glad you liked it!

[@adampower9757]

@@TylerLey 4:56 we do cranking there. bending bar 45o at tension reversal points

[@nickparkin8527]

I love how enthusiastic you are about concrete. This is the wonder of the internet. We can get connected to so many people who are so into their niche which gives us quality content like this.

[@bergsten2561]

Brilliant. So many fantastically confounding topics covered in one video, abridged comprehensively . Thank you for your enthusiasm and diligence!!!!!!!!!!

[@roygbiv5164]

The enthusiasm he shares during his videos could make any topic interesting, his subject: concrete. Viv la concrete!

[@sudeep2580]

Today I learned something new about RCC ! Thanks mate .

[@paulchadwick9071]

This guy is the Bill Nye of Concrete!

[@asena1189]

This video is a summary of what teachers are trying to tell in lessons of reinforced concrete, but they cannot. Maybe they do, but not make it fun like you! Thanks a lot! I really enjoyed listening you.- Greetings from Turkey

[@aqabajordan5356]

مش عارف ايش احكيلك بروف... لكنك فهمان وذكي وعندك معرفة كبيرة، وبحب احضر جميع مشاركاتك .. بالتوفيق تيلور

[@ahlamddj]

احكيله شكرا

[@aqabajordan5356]

@@ahlamddj حاضر

[@TylerLey]

@@aqabajordan5356 Thanks, I think!!!

[@MeriemM94]

Tyler Ley He said : « I dont know what to say prof ... but you are intelligent and have great knowledge, i would love to attend all your classes... wish you success Tyler »

[@jessicas9844]

You explain so much better than my lectures. Now i really understand

[@skyrocketcoast219]

Hahaha! He was a gardener? Excellant. i have been in horticulture 60 years! And concrete work was a big part of our lives in creating things! In College , i even took a 3 day intensive field class of the properties of concrete. In 1980, there was 2 of us women in that class of 25! That 1 weekend class gave me the science of concrete! As a landscaper & now on small ranch- thar knowledge has helped when i bulit my big corral & horse shelters! Love your channel!

[@carlosmelick7075]

Watching your video should help reenforce our diligence. Also thanks for the history lesson.

[@azentioced9]

that was just what i needed to know! THANKS

[@magicbeans6153]

nice watch from someone who makes up rebar beams/cages for construction , now i want to see it being used and concrete being poured !

[@dadajulius6489]

Thanks for this. As an Engineer, this has made me learn more about concrete and reinforcement. Concrete is strong in compression but weak in tension that's the main reason why reinforcement is required. Doing this will eliminate or reduce cracks to be as minimal as possible. Well explained!👍

[@mikefixac]

Love it Tyler. I don't know why I'm so fascinated with concrete, but I am.

[@TylerLey]

Keep going!!!! It is the greatest material in the world!!!

[@PeterParker-hf8ok]

Same i wanna build like small houses

[@sowonchoi3842]

OMG! I really love your explanation.

[@foldby37]

The best series of base understanding concrete really easy to understand, therotical and pracrical usefull wery inspirering, thise infos are really neded in the industry.. Thanks a lot.. I have made so many mistakes myself, and payed the price, my mistakes made me look for better ways to do concreate, this is the best so far.

[@TylerLey]

Thanks so much! I agree that mistakes are so powerful. Keep sharing your lessons with others! Thanks again for sharing your experiences.

[@mohammedismail-lx2dq]

Excellent lecture 👍.... Thanks for your video.... I am waiting for your next video from INDIA ....

[@shaanchutoori]

as a UG Trainee engineer this is so helpful

[@fanghuige4369]

this video is so clear and straightforward, amazing work!!

[@sheenfulleroshular7122]

Great Content! Watching from Philippines

[@jonremmers1828]

This is so good! Love the narrating style! And lots of useful info. Thanks!

[@chintan933]

I always wondered why they put plastic before concreting. Now i understood.thank u tyler

[@Gary-pogi]

I learned too, I thought it was only to aid in hydration. Never considered plastic sheeting lessening friction to avoid cracking.

[@chintan933]

@@Gary-pogi yes yes

[@scorpio6587]

Also for an air and water barrier.

[@MeriemM94]

You give me a new love for structure. Im a fresh architecture graduate from Paris. Keep going !

[@emmangleenloyola1348]

I LOVE HOW ENTHUSIASTIC HE PUTS ON HIS SUBJECT

[@prajwol.001]

Love the guy's spirit

[@bigrockcandymountain8397]

Tyler, I think you’re the only person besides myself that gets giddy about concrete construction. I’m not a DIY home owner...oh wait...I guess I am, I just happen to have a General Engineering and General Building license in California for about 40 years. I’m getting ready to design a, my first, post tension sog in northwest MO. I’m so happy 😁 !

[@TylerLey]

That is so cool! Let us know how it goes!!!

[@jeffrickstrew6294]

Great video. As being in the concrete construction trade for 35;years, I can attest everything you've mentioned is how we do it.

[@AlgoDar]

We see Prof. Ley’s New Video, We Directly Watch it. You are my new Netflix 😂

[@swadhanandy9666]

Very interactive video indeed......thanks for sharing Monier’s inspiring story

[@Nafeeshomedesigner]

Ur lecture so excited ....i want to know more about concrete properties

[@AkhtarWaqqas]

You videos are easy to understand and follow. Thank you.

[@ibrahimamania.8487]

Thank you so much for this information. This will help me with teaching my students about rebar works.

[@elyaskhorrami1541]

Thanks sir. This is the first video that I have learned from, it changed my mind about reinforced

[@Withnail1969]

I'm excited as heck about concrete now.

[@windaddiction]

Over Reinforcement is a problem too! Go engineers!

[@AnimooBobba]

Specially when it comes time to knock it down, or pay the steel bill.

[@Lewis.Alcindor]

Yes. Also, designing steel reinforcement at a significantly higher tensile strength than the compressive strength of the concrete is also a problem, because the concrete can crumble and fail well before the steel will show signs of yielding.

[@legendarylips1]

over reinforcements will be a problem for only surface cracks . nothing more . that crack might be sometimes deeper . doesnt matter once you patch it proper way

[@abeidmohamed9927]

Much respect for shearing education of construction we need more and more skills

[@zack0medi]

hello from Malaysia. great video! the way you give the explanation surely shows you're a concrete freak, and i love it! keep em coming

[@leosalonggat6579]

Wow..I am going to be a Future Engineer because of you ❤️

[@nokoramahanelo1035]

excellent teacher u are...from south africa

[@freddygill3425]

I love you dude! You are such a good teacher! Thank you so much for all your hard work and explaining thing so simply so I can actually understand! God bless you bro!

[@TylerLey]

Thank you so much!!!!

[@justincase9638]

You are crazy energetic when you lecture - I love it!

[@empty_kwfggh3i7ywfihf]

These videos are pure awesome.... especially the crack sound effects :) haha

[@DGDG0000000]

perfect tutorial. thanjs also for talking about our great Mr Monier. you are the best.

[@TylerLey]

Thank you so much for the kind words. GO FRANCE!

[@hgbugalou]

I am pouring some footings for a pergola I am making and I put a rebar "cubes" in each one because of your channel.

[@TylerLey]

I am glad it helped!

[@francoisdelfossebe]

Thanks Tyler! Complexity broken up into simple concepts & practical solutions. Also, the gray background is perfect.

[@NickTaylorRickPowers]

Why pay for a degree when I can watch this guy

[@andreabriglia4789]

Thank You Professor

[@CyanCivilian]

You sir are a true Hero. Thank you

[@babongo]

Love the passion; absorbing the facts.

[@edshuttleworth1549]

Find a metal stamper, the ones who run progressive dies- I ran a stamping plant and would save the skeleton -what is left from a strip of material after the part has been parted from the strip. I used these on several projects around the house, the material was 1/8 - make sure you agitate as the shape is irregular.

[@francismbanda9951]

Very educative.

[@AlphatecEngineering]

Great video Tyler

[@eugenetrollip751]

Very informative. Check your conversion at 6:28. 1,5" is 38mm and not 67mm

[@eltabordakike]

Thanks for posting this video. You made it interesting and amusing.

[@muhammedmubeen1015]

Many you really cheer us up. Great job mate!

[@TylerLey]

Thank you so much!!!

[@myparadiseonbantayanisland9030]

In the Philippines they put rebar too close to the outdoor surface and moisture seeps in and corrodes the rebar and the expanding corrosion cracks the concrete. They also lay the rebar on the bottom of the second floor or patio and same story the moisture seeps in and corrosion and cracks and also the rebar isn't doing anything except crumbling and falling on the floor below.

[@ewnet6479]

Nice explanations

[@phil5569]

I'm starting to realize that I'm a total effing NERD. I LOVED this video! Who'd-a-thunk that concrete reinforcement could be so interesting....

[@jcaallen6662]

Very informative. I work for Tindell. This is a wealth of knowledge to help me have a greater understanding of the mechanics behind my daily labor. #MorePlease

[@TheDonvela]

This video was amazing, and the motivational quotes at the end were very appropriate for me in this moment of my professional life. Thanks, Tyler.

[@TylerLey]

Keep going! The amazing things are just beyond the pain. You can do it!

[@silvinremedios7347]

Superb Explanation Tyler..I loved it

[@mesutbozkurt9637]

Good information 👍🏻 👌 👏

[@artbyrobot1]

I read that putting rebar near outer surface of concrete is bad and there should be 1-3" buffer of concrete around any rebar to prevent spalling and protect rebar from moisture/rusting

[@pulporock]

Another excellent video; well explained. Maybe a demo of a beam cracking with and without reinforcement. Minor point at 08:10 you mention the steel should be 1.5" from the top (67mm) hmm I think it should be (40mm). I only point it out as lot from around the world will see the metric. I see too often builders think the steel mesh should go in the center of the slab for slab on grade/ground. Cheers Pulpo

[@TylerLey]

Pulp! Thanks for the correction. Metric is not my first language. =) Some people think that putting the steel in the center is better but based on recent work I think it is best on the surface as it helps keep the cracks small where people see it and it is exposed to outside chemicals. Thanks again for watching!

[@patrick247two]

"Master, I have become the structure."

[@dchaitanya2032]

Underrateed

[@Thepriest39]

Build it for life. The cost of rebar at the time of installation is cheap compared to tearing it all apart and redoing it.

[@joetheinfidel4041]

As a union carpenter, that does tons of structural concrete, I love this video.

[@owenwilberforce6138]

Great job with this video. Taking a deputy inspector course for reinforced concrete now and this is very interesting and helpful.

[@j81851]

Hey Tyler, love your work and your personality. My gosh your energy is contagious and fun! Keep up the good work it is fascinating!

[@mukasaibraart]

I love your style of teaching bro

[@mccallumcra]

You should try welded wire mesh. I've done designs with D 12 2 x 8 mesh in multiple layers for pipe design and you should see what happens when you mix it with 60MPa concrete. Unbreakable.

[@RadoHudran]

You're a funny teacher, thx for explaining

[@hendraprasetya2999]

dude so great information so enjoyable to watch ... keep up !

[@TylerLey]

Thanks!!!

[@silvinremedios7347]

Superb explanation Tyler..I too am very interested in concrete reinforcement

[@sylvainestinvil512]

You're a pro! You've done a wonderful job.

[@MilciadesAndrion]

Great explanations and I learned about Monier and his experiments. Your style is unique. I enjoyed the video a lot and I liked it and subscribed to the channel.

[@mohamedhussein8092]

Cool informative video.. Subscribed Regards from Egypt ✌️

[@TylerLey]

Thank you!!!

[@liloukulele5238]

For basic gravity loads, is easy to grasp tension and compression loads. Add in the dynamics of seismic load and you need to consider different reactions. A basic equation for the seismic load distribution, Ai =1/ αi , is obtained based on the assumption that the velocity spectrum of the ground motion is independent of the period. Further, it is obtained from the maximum shear response using the elastic shear bar with both uniform stiffness and mass distributions. Through lessons learned (and still learning) some structures are designed stiff while others are designed flexible.

[@tonderaibangwayo6710]

Thank you so much

[@johnharris2605]

thank You again professor- Unfortunately, have been involved in projects that have so much rebar, there’s little room for the concrete-a lot of lost denver vibrators. I believe that within our industry, we can pretty well predict where it will crack- but sometimes it just “depends”

[@shabinbaakza8176]

I loved it and understood every word of it ...thank u dear

[@GRUBB-MUDD]

I wana talk wire mesh and how i thinknits over rated for residential concrete

[@robertarevalo5883]

Thank you for sharing this video. Just want to share my observation when I was briefly assigned to Saudi Arabia, it's about plastic-coated rebars and tie-wires used (slab) without any sign of rusting even after 20 years. It would be great if there will be pre-cut rebars and plastic-coated for structural, so as to assure no metal exposure to cement.

[@fukuokainternationaldemocr1974]

With respect to your pictures of re entrant corners you show 1 bar at 45 deg to mitigate cracking. On my re entrant corners I am considering a 30cm (10") radius to eliminate the hard 90 deg inside angle, with rebar following it round. However it would be quicker just to lay down straight rebar at say 30 and 60 deg, or even 3 sets at 22, 45 and 77. Your views greatly appreciated.

[@darthvader5300]

Intersecting steel rebars that form right angles forming a double-shell reinforcement 1 inch deep below the concrete top surface and 1 inch above the conrete bottom surface. With post tensioning used in bridges that has 2 supporting beam and post supports, then on a slab it should be INTERSECTING LENGHTWISE AND CROSSWISE POST TENSIONING for the supporting beam and post supports are replaced by the EDGES of the slab at the FRONT AND BACK AND LEFT SIDE AND RIGHT SIDE. The the post tensioning should be Intersecting post-tensioning cables that form right angles from the front to the back, and from the right side to the left side. But personally I prefer a double-shell of intersecting steel rebars that form right angles like a square grid pattern. And combine it with double twisted pre-anodized galvanized steel fibers. Forming a very dense hybrid steel rebar-steel fiber reinforced concrete.

[@RobertWilliams-mk8pl]

I really value seeing your vids.

[@TylerLey]

Thanks so much!

[@ShannonWare]

I have never believed in concrete as much as I do right now!

[@TylerLey]

YES!!! Thank you so much!

[@DexterDeeApostleCharlesKaranja]

So much emotion guy, good info @Dextcharles

[@imanal-taie3349]

From Iraq. - thank you sir -- you r great

[@Migger_29]

My grandpa inspired me to become interested in concrete. I heard he was a major engineer for some European country during WW2; he designed some towers that still stand to this day!

[@waz1167]

Thanks for the great video

[@ibrahimjafaru6031]

Please can you do a video on raft foundation , and please why do we have extra additional layer of reinforcement in a raft foundation

[@mdaqibmattur7946]

So wonderfull lecture.. need a lecture about plinth beams it will be very helpfull if you provide this on your channel