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.
@ferbllaneta16953 жыл бұрын
Hi, i think you should consider the 135° bend of stirrups.
@i3_133 жыл бұрын
Plot twist: he's the engr in charge
@proyekmania3 жыл бұрын
Hahahahaha
@deepakj72563 жыл бұрын
Good one 😹
@vhelai83 жыл бұрын
Hahahaha 😂
@paulphoenix86733 жыл бұрын
an idiot engineer
@amsterdamn92363 жыл бұрын
Thats the result of online class instead in actual
@sammario36332 жыл бұрын
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.
@KAMRANKHAN-xf7iq3 жыл бұрын
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???
@paolopablo52923 жыл бұрын
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.
@pawanpopli14283 жыл бұрын
How can we use vibrator with 2" stirrups spacing, its not practically possible
@hamidafridi983 жыл бұрын
Sir try to point out such mistakes on site..it's really helpful
@Knowledge-bw6cx3 жыл бұрын
Good thought.
@mob-dee42103 жыл бұрын
It’s what he just did
@hamidafridi983 жыл бұрын
@@mob-dee4210 of course but what I mean to say is to keep it up
@KakashiHatake-fh5xs5 ай бұрын
So the bars on the side of the beam are required or not, because most of the construction they provided
@fayazkhattak6619 Жыл бұрын
In cantilever stirrups hooks should be at compression zone.
@jjulianasociados25113 жыл бұрын
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.
@susaankafle1973 жыл бұрын
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.
@ganiputra33903 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
@liyaqathali26483 жыл бұрын
@@ganiputra3390 yes,2 inch spacing is too short for concrete pouring/workability. 3-4 inch is good.
@ganiputra33903 жыл бұрын
@@liyaqathali2648 thank you profesor
@isaacsitwala2280 Жыл бұрын
Am enjoying the video clips..keep it up...
@sangeenzaman30263 жыл бұрын
Isn't it overhanging portion of beam?
@shamigarkongahapitiya5229 Жыл бұрын
Thank you dear Sri .
@huvetolohe35113 жыл бұрын
Really helpful,guide us in every corner .Nagaland
@faisalkhan38253 жыл бұрын
You are doing really good work, I appreciate your work
@eWorm32492 жыл бұрын
Is cutailment just to economise or is it really necessary?
@bresendamarak72053 жыл бұрын
Correct it...
@schmooverboover3 жыл бұрын
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...
@sadiq5681 Жыл бұрын
So how many inches does floor beams to be the intervals
@AftabAlam-ok5jx3 жыл бұрын
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?
@lenxi9880 Жыл бұрын
Klaro Bien bweno bravo 👏
@vangcruz44423 жыл бұрын
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.
@mohamedmansoorali53103 жыл бұрын
You cannot cut the bottom bars just like that bro. Those things should be only after Structural Engineer's intervention.
@vangcruz44423 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.
@liyaqathali26483 жыл бұрын
Nowadays even 10th class paas person calls himself Entrepreneur or builder or engineer.
@bhavanishankar81933 жыл бұрын
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 ...?
@godfreymwashi42611 ай бұрын
Interesting points
@siddheshwagh97702 жыл бұрын
What about link joint which is at top side ?
@md.mizanurrahmanaru31283 жыл бұрын
Nice job Sir,,,, Love u sir,,,,, from Bangladesh
@Dear_90003 жыл бұрын
Plot twist: He designed the cantiliver beam and the steelmen just followed the design... Hahahaha
@animadolai8214 Жыл бұрын
Thanks
@mohammedzeaulhoque38883 жыл бұрын
Thank you so much to give a very important advice
@shalzmv1 Жыл бұрын
Joints in the cantilever beam should have been in the lower part as the upper part is under tension
@JohnRobertBiate3 жыл бұрын
Very helpful 👍👍
@panajotismarioselia18783 жыл бұрын
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)
@dansuciu883 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
@emanuellallawmkima37503 жыл бұрын
@@dansuciu88 if that is the case... is two rods a necessity?? Or just one on the side is enough
@dansuciu883 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)
@louiszadupreez3 жыл бұрын
The additional bars will help with controlling the cracks that develop during loading
@john-vt7nk3 жыл бұрын
Correct..very nice
@muiizuddin3 жыл бұрын
You should have guided the Mason earlier!! :-P
@topnewsandfun Жыл бұрын
Why the stirrups use 8 mm dia rod? Why not 10 mm diameter
@sampangibalakrishna52763 жыл бұрын
Sir why we are treated as tension at top in cantilever beam..
@pranjalsaxena45733 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-bw6cx3 жыл бұрын
Because usually we have negative moments in the upper zone of cantilever beam .
@sj61153 жыл бұрын
Development length at free end?
@sunilkhandagale99663 жыл бұрын
Its very imported info abt the pleanth,thanks sir
@jharrelmadarang78903 жыл бұрын
You should also check the bend of those stirrups. Jeezz
@saadmughal72033 жыл бұрын
90% construction in pakistan is faulty. May God help us!
@devarushidevarushi18103 жыл бұрын
Very good sir
@cttavdiwala35363 жыл бұрын
hello sir where r you from
@fashdbash2 жыл бұрын
thanks for this
@wankidkhar87413 жыл бұрын
Sir ...please upload somemore video...it's helpful
@Yemmmysmog3 жыл бұрын
Thanks so much, it is helpful
@vuitehruaipuia66653 жыл бұрын
135 degrees hooks missing
@MasterCivilEngineering3 жыл бұрын
Really big mistakes😕😕😕
@apnaghar56303 жыл бұрын
At junction torsion and shear both developed
@1ali19963 жыл бұрын
mmmm am nervous about this ....
@aliqadri46723 жыл бұрын
0:34 what you say after dual...?
@beingself53333 жыл бұрын
He says provide dowel bars, not dual.
@tariqhameed52073 жыл бұрын
Maran pakhto waya kana Daumra mushkil sara eng de wailo Negative steel ba warkare we practically
@peterengti24273 жыл бұрын
Thanks🙏 sir
@muktharshaik17963 жыл бұрын
jazakallahu Khair bhai 💖
@sheikhjunid58172 жыл бұрын
assalamu alaikum canteen your bheem ke bare mein Bata rahe aap Hindi mein bataiye main Javed thekedar Maharashtra amravati se
@basitali52773 жыл бұрын
Sir G der khkaouli move mnga taos shan' teacher pakr dy really Sir
@anoopnarayan5433 жыл бұрын
Anchorage at free end? Please read some good text books!
@marksaballa22863 жыл бұрын
The spacing of stirrups is a mistake. How can that be the spacing is uniformed?
@raviakash29553 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
@benjaminsangcaan49802 жыл бұрын
Top bar what it should be. 1st of all you havent show drawing if mistake or not
@kallasai65373 жыл бұрын
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?
@basitali52773 жыл бұрын
Sir l have questions sir g mnaga da wale free predou I'm waiting for u sir g plz
@jjgibson34093 жыл бұрын
The side steel rods help with weak axis moment
@louiszadupreez3 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.
@jjgibson34093 жыл бұрын
Hard to say without knowing the loads/design. The side bars can also helps with temperature and shrinkage.
@albertfoo15693 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
@hussainkazmi48293 жыл бұрын
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
@mukundkrishna51613 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.
@hussainkazmi48293 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).
@rajumugali99093 жыл бұрын
Nice Sir
@ronieoroceo79033 жыл бұрын
Even not cantilever it's always have extra bar,
@sadeghicivil38033 жыл бұрын
Wow perfect 👌🏼👌🏼👌🏼
@manishkumarjha34273 жыл бұрын
Stirrup hooking is incorrect
@handcannon98143 жыл бұрын
I think u need an ipad to sketch on site or just a pen and paper
@victorkirui39983 жыл бұрын
Helpful
@amsterdamn92363 жыл бұрын
At this video he knew, his project is failure
@trailerhow3 жыл бұрын
Nice
@brendanquinn68943 жыл бұрын
If this is true, why didnt you interview the engineer who designed it and hear what he has to say ?