I think that your critique might br omitting the constructability angle. Consider this; The bottom bars might have been designed like that for uniformity and ease of construction. 5 feet of a single #16 bar might not be worth differentiating the top and bottom teinforcement of the beam, especially if its a part of a continous bea. 3#16 bars on the top could be sufficient to carry the negative moment. The bars on the bottom, however, might just be a continuation of the reinforcement of the neighbouring span left like that on purpose.

what about the uniformity of cover over the cantilever span as we see the transeverse bar at joint has pass over the bar of cantilever beam?

Hi, i think you should consider the 135° bend of stirrups.

Plot twist: he's the engr in charge

@proyekmania

3 жыл бұрын

Hahahahaha

@deepakj7256

3 жыл бұрын

Good one 😹

@vhelai8

3 жыл бұрын

Hahahaha 😂

@paulphoenix8673

3 жыл бұрын

an idiot engineer

@amsterdamn9236

2 жыл бұрын

Thats the result of online class instead in actual

I am a structural engineer. I think your structural engineering knowledge is based on the office designs. The construction site people may be not qualified as you. They provide same steel at top and bottom in a cantilever because to avoid mistakes of placing smaller diameter bars at top. Also it will cost minimum compared to the failure of the cantilever. Stirups no need to be closer at the support. Provide what is required. People do mistakes at site. Think practical than the book work.

So in case of cantilever the hogging occurs which means the tension in the upper zone and compression in the lower zone of beam that's why we always provide rebars especially in tension zone as steel can carry very powerful tensile loads without failure. We also provide steel in compression zone also but we use it very less as concrete is sufficient to carry the highly compressive loads and stresses. Just try to avoid or make less rebars in compression zone! What about torsional stresses? Where we will give torsional rebars if there is a chance of torsion???

How can we use vibrator with 2" stirrups spacing, its not practically possible

Another method in the cantilever beam is to provide hanger rebar along the junction. The spacing of the stirrups along the junction should be nearer with 50mm space, then 100mm, then at the end with 150 to 200mm.

What about link joint which is at top side ?

So how many inches does floor beams to be the intervals

Good afternoon sir I have a doubt ....now we r provided or not extra bars in cantilever beam ...it is enough for top and bottom bars ...?

Is cutailment just to economise or is it really necessary?

You are doing really good work, I appreciate your work

Isn't it overhanging portion of beam?

Thank you so much to give a very important advice

Really helpful,guide us in every corner .Nagaland

So the bars on the side of the beam are required or not, because most of the construction they provided

Nice job Sir,,,, Love u sir,,,,, from Bangladesh

Development length at free end?

Thanks so much, it is helpful

hello sir where r you from

Am enjoying the video clips..keep it up...

Sir try to point out such mistakes on site..it's really helpful

@Knowledge-bw6cx

3 жыл бұрын

Good thought.

@mob-dee4210

3 жыл бұрын

It’s what he just did

@hamidafridi98

3 жыл бұрын

@@mob-dee4210 of course but what I mean to say is to keep it up

Its very imported info abt the pleanth,thanks sir

Very helpful 👍👍

In cantilever stirrups hooks should be at compression zone.

Why the stirrups use 8 mm dia rod? Why not 10 mm diameter

Sir ...please upload somemore video...it's helpful

Thank you dear Sri .

Sir G der khkaouli move mnga taos shan' teacher pakr dy really Sir

Rebar in middle height of section could be torsion reinforcement. Cantilevers should be designed to withstand tension on both top and bottom in case of moment reversal and vertical seismic forces. Continuous rebar over columns should be sufficient for development length if amount of steel rebar is correct. Hooks on hoop reinforcement should be 135 degrees and spacing should be checked for VP.

I'm quite scared about the structural capacity of buildings in your country/area after seeing this amateuristic way of correctly determining the needed amount of reinforcement...

Sir why we are treated as tension at top in cantilever beam..

@pranjalsaxena4573

3 жыл бұрын

Because concrete is weak in tension and in cantilver beam at the top of the neutal axis is in tension and below that is compression.... to make it safe from failure more r/f is provided on the top side.

@Knowledge-bw6cx

3 жыл бұрын

Because usually we have negative moments in the upper zone of cantilever beam .

jazakallahu Khair bhai 💖

Sir l have questions sir g mnaga da wale free predou I'm waiting for u sir g plz

Wow perfect 👌🏼👌🏼👌🏼

Thanks🙏 sir

You should also check the bend of those stirrups. Jeezz

Thanks

Joints in the cantilever beam should have been in the lower part as the upper part is under tension

Correct it...

Klaro Bien bweno bravo 👏

The spacing of stirrups is a mistake. How can that be the spacing is uniformed?

@raviakash2955

3 жыл бұрын

You can see that the stirrups are closely spaced near the fixed end.the fixed end is the region where the shear force will be max in a cantilever beam. We provide stirrups to resist shear force and so the region near the fixed supports have closely spaced stirrups. But on the other hand the free end of the cantilever has relatively low or even negligible shear stree. So it is unnecessary and uneconomical to provide more stirrups at the free end. I hope you get it. Thanks

Nice Sir

Bars taken from continuous beam connected to the cantilever portion should be fine, so regular rebars of 3 on top and bottom shouldn't be a problem, two extra bars at the middle might be torsion bars but for that depth might not have required so yes could have been used at the top. Stirrups of 4" spacing should also be fine but considering the 5' of cantilever, shorter spacing would be better, but I've never seen use of just 2" stirrups spacing even for any cantilevers.

@ganiputra3390

3 жыл бұрын

Is it possible to pour up concrete with stirrups by 2 inch? Based onACI I think its 4 inch not less than that.for concrete workability

@liyaqathali2648

3 жыл бұрын

@@ganiputra3390 yes,2 inch spacing is too short for concrete pouring/workability. 3-4 inch is good.

@ganiputra3390

3 жыл бұрын

@@liyaqathali2648 thank you profesor

Correct..very nice

Just cut one steel rod from the bottom then there will be more steel rod on top and cut the two side rod since it is not needed.

@mohamedmansoorali5310

3 жыл бұрын

You cannot cut the bottom bars just like that bro. Those things should be only after Structural Engineer's intervention.

@vangcruz4442

3 жыл бұрын

@@mohamedmansoorali5310 I thought the structural engineer was suggesting that there are one to many on the bottom and the two sides are not needed.

@liyaqathali2648

3 жыл бұрын

Nowadays even 10th class paas person calls himself Entrepreneur or builder or engineer.

Interesting points

Hello, im just a student so im sorry if my comment dosnt make sence. I remember, that we were told, that if the beam is to high we should add a rebar in the middle it relates to capacity of main diagonal (sorry not sure whats the right transcription)

@dansuciu88

3 жыл бұрын

that is correct. in EC2 if the beam height is above 700mm you provide additional "side" reinforcement. this is both for constructive purposes and to take torsion

@emanuellallawmkima3750

3 жыл бұрын

@@dansuciu88 if that is the case... is two rods a necessity?? Or just one on the side is enough

@dansuciu88

3 жыл бұрын

@@emanuellallawmkima3750 it depends on the beam height. If it is above 700mm, but less than 1000mm you just need 2 constructive bars (1 on each lateral face) tied by a tie or stirrup. If it's above and there is no significant torsion, you place these constructive bars 400mm apart. So more than 1 per face can occur. (have not seen more than 2 in my practice)

@louiszadupreez

3 жыл бұрын

The additional bars will help with controlling the cracks that develop during loading

You should have guided the Mason earlier!! :-P

At junction torsion and shear both developed

Maran pakhto waya kana Daumra mushkil sara eng de wailo Negative steel ba warkare we practically

0:34 what you say after dual...?

@beingself5333

3 жыл бұрын

He says provide dowel bars, not dual.

Very good sir

135 degrees hooks missing

Helpful

90% construction in pakistan is faulty. May God help us!

Plot twist: He designed the cantiliver beam and the steelmen just followed the design... Hahahaha

Nice

Really big mistakes😕😕😕

mmmm am nervous about this ....

Stirrup hooking is incorrect

thanks for this

Guys I had a doubt he said development length is to be in provided in the end . If it's not provided what will happen? What are thay causes also?

Even not cantilever it's always have extra bar,

assalamu alaikum canteen your bheem ke bare mein Bata rahe aap Hindi mein bataiye main Javed thekedar Maharashtra amravati se

The side steel rods help with weak axis moment

@louiszadupreez

3 жыл бұрын

Wont the top flange of the beam provide lateral stability? so the beam wont really experience a moment about the weak axis, so the steel in the midsection will be redundent.

@jjgibson3409

3 жыл бұрын

Hard to say without knowing the loads/design. The side bars can also helps with temperature and shrinkage.

@albertfoo1569

2 жыл бұрын

Minimally, mostly for cracking purposes if > 750 mm, or if beam designed for torsion

@exzar9684

Жыл бұрын

@@louiszadupreezwell designer probably used staad where slabs aren't modelled as part of the analytical model so cantilever ends up with side face reinforcements for torsion which is conservative designwise

I think u need an ipad to sketch on site or just a pen and paper

I want a job in your country

@cttavdiwala3536

3 жыл бұрын

please reply

At this video he knew, his project is failure

Anchorage at free end? Please read some good text books!

বাংলা প্লিজ

Main beam is correct

Ur no sir please

Wastage of steel rods. Wait man. It would be answered by person who designed this structure. You are just a site engineer and your work is to make sure to implement the structural drawing

@mukundkrishna5161

3 жыл бұрын

Exactly. Dude is going on passing comments like he has designed the structure. He doesn't even look at the drawings, what the structural engineer has provided. Because of guys like him, many of the beginners think whatever he is saying is right.

@hussainkazmi4829

2 жыл бұрын

@@mukundkrishna5161 exactly. I've come across so many videos where these people are sounding like they are some sort of authorities. You would find site engineers without any clue about how to do structural design manually or by using software. These guys just follow right hand rules( past practices).

Top bar what it should be. 1st of all you havent show drawing if mistake or not

Hindi 💪💪💪💪

If this is true, why didnt you interview the engineer who designed it and hear what he has to say ?

1st