Cranked Bar with 3D Animation 

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The clearest explanation of why you need cranck bars at the point of where the beam meets the column is the best explanation I have seen thus far even doing a structural engineering diploma course which is pretty good, but they never explained it where I got it instantly like this.

Again for the million time i came to a conclusion that youtube is better than all my professors !

Clearly you fully understand the topic as the visual drawings are great. Although, I struggled to understand a few names at key points. I appreciate that teaching in a second language is no easy thing. Would love to have understood more (Y)

Thanks sir Clearly understood concept in beam section

I never get this much information from my college. Thank you so much Sir. Thanks a lot. You are a very good teacher .

Excellent Effort! Keep Rocking

superb explanation...thank u sir

Interesting! I am an avid fan of yours. I was learning everytime you uploaded new content. Thank you.

Explicación super detallada MAESTRO. Felicitaciones

Nice explanation video sir thank you for this video sir

Super Sir really want this analysis sir♥️

Thanks for this video

Thank you very much it helps a lot...there's a lot of confusions in rebars but you explained it so clear Godbless you

Excelent explanation, I was asking for it. Thank you.

very clear explanation.Thank you very much sir.best of luck for you...amal from - sri lanka

Good explanation!

Wow thanku you I understand well

Thnks alot sir

What as amazing teaching skills god has bestowed on u sir l have grasped the concept immaculately thank u gentleman

Sorry to as a question that might be silly....I don't have any background in civil engineering but I am getting a house constructed. So I have been watching some of your videos. As the position of the crank bar is where overlaps are not allowed, does it mean that no overlaps are allowed in a crank bar?

The best explanation l have got on positive and negative bending moment of beam l clearly understood it now thanks

Great sir

Thank u sir

Vert good, i didn't know that. i know pre constraint tensioning rebar beam.

Fantastic

Thanks bro

very important vedio, even it decrease wastage of Re-bares, for lapping and splice . 10Q a lot

Ur explanation can easily understand thnks sir

Well done.!

Expertise in civil engineering here

well done virora..deer kha.. if you are pakhtoon then I hope you will must be like it :-)

so what about using 3-4" galvanized nails mixed in the cement batch for the cost savings in time one could add 100% more steel in mass ..

I like it

What are effect if used two tops over two pillars instead of CRANKS! DOES IT SAME EFFECT OR NOT? PLEASE RESPONSE

Sir nice video but I have doubt how can 8.8 inch bar can reach bottom of 1.5 inch in slanting conditions please explain me

Most of us learn the things from you tuber like u sir ..what's the role of colleges?

Masterclass

Thanks engineer👍

Great

Great presentation of concept. Best explanation that i ever seen about actual concepts of reinforcement provision at beam and reason for that.

Super, Wonderful

Thanks For Teaching Sir

What’s the name of music played in the start of video??

I am curious why not three bars with the top two over lapping the bottom?

👍👍

Thank you so much.. very nice lecture sir

It's √2D i.e. 1.42D not 0.42D because cranked bars are bent at 45 degree.. It's simple trigonometry

Nice content this is usefull for us

Sir, how to place his crank bar for a rcc beam which is upstanding (above slab) 13" (with slab 5" = 18"). Beam Length is 20'

Good information sir

Sir would you please upload a video on how we decide the position on slabs as well as on beams to crank the bars.i mean thumb rules to find the location on beams and slabs where bars will be cranked

How did you calculate L = 0.42 *D ? which code did you follow?

Sir , please do some videos about how to calculate the total length of a bend up bars with hook and tell some interview questions too....

Distance is offset of the crank but what is that point from midspan? 1/3rd?

What about columns bending movement? Can crank transfer directly from a column to another? Today lifted bars...

Thank you Sir. 🙏🙏🙏

Thanks for the excellent webinar.Dr.V.Selvan,KCT,Coimbatore-49

Can you upload how to calculate a concrete slab on piles straight with no culmbs like a bridg in water or a ro ro platform please 🙏

Pl.ae Share all your videos

Thanks

Excellent

Nice

I am agree with gopal and think the same.

Excellent ,

Thank you.

My question is "if its placed in whatever angle i.e 45° in this case, then the length of the cranked will automatically be determined...right??

good

How can length of crank be less than D ??...also do the cranked bars help to resist vertical shear force ?

Please review the length of cranked bar.. Its not actually the length of inclined bar.. 0.42D is the combine length along the base of complete base.. Review using basic Pythagoras theorem.. U have 45degree and perpendicular D. Soo inclination length comes to be D÷sin45 ... 0.42 comes after substitution of base length.. Because when you calculate bar length you already include base length taking length of span

how to know at what distance the crank should be made?

I think you meant 1.41 and not 0.42? The hypotenuse of a right triangle can't be less in length than one of the sides of a triangle. You also did not explain why you need to crank the bar. Why not just have steel at the ends on the top and on the bottom for the middle. Why add the additional cost of cracking the bar?

If it's 45degree angle , then the length of Crank must be equal to Diagonal length , can be derived by Pithagorus theorem (Right angle triangle), i.e 1.42*d or 1.42*21". I Dnt think ur formula is right as per geometry atleast.

1)When do we provide cranked bars??? 2)do we need to cranked the steel bars which we r going to provide or we need to put an extra bar ??? 3)do every beams have cranked bar ? 4)In design steps of beam , is there any step for cranked bar ????

Good

If i had learned this before at the University...

❤❤❤❤❤❤

Are cranked bars required if the beam is laid on earth soil?

The diagonal distance (hypD) is 1.42D not 0.42D. D = Beam Depth - 2 x Cover - Tie Diameter [10mm or 0.394] D = 24in - 2x1.5in - 0.394in D = 20.606in NOTE: 45°, horizontal length = vertical length = D hypD² = D² + D² hypD = sqrt( D²+ D²) hypD = 29.141in k x D = hypD k = hypD / D k = 29.141 / 20.606 k = 1.42

Is there any anchor bars in the upper side

Is it possible to remove the diagonal beam i. e which is put at 45°

Where provide crank bar in plint beam

Crank bends, 8.8 " does not fit within your (24' -3") = 21" height beam.

What should be the angle made for crank bars?

Whether we should provide single crank or double crank bar in a beam??

Perdón es 21/0.7071=29.7, o sea 21/sen45°=29.7. Tambien puede ser 1.414x21=29.7.

Where u put lapping in the slabs

La respuesta correcta es 21"x0.7071=29.7". Creo que esto fué a ver si ponen atención.

My question is : is crancked bar also for save money? I am askim because of why you did not use 6bars for beam. 6bars are safely they can work positive and negative loads easily. Could u please answer my question? Many thanks

How inclined length of crank bar is less than half( 0.42) of straight depth. I think there is some correction.

Excelente explicación...solo que las letras negras no dejan ver la explicacion en el pizarron.

This is an outdated design . According to the design codes in the past more than 30 years , there is the requirement for certain amount of positive moment reinforcement to be anchored past the face of support . The anchorage past the face the support should be able to develop a force of 1.5x shear force at the support

tambien escrbelo y explicalo en español amigo xq yo veo tus videos desde veracruz mexico

Youre placing your crank bar at the opposite. A crank bar is just the same design as a lift spring of a vehicle or the arc of an old bridge.

Sound is very low n not clear...

0.42D may not be correct Diagonal length will be more than D

I guess the cranked bar is phasing out.

Use either 45 degree or 0.42d.not logical to use both lol

Sir ji crank length must be 1.42D not 0.42D.

The length of the crank bar should be 1.42 D not 0.42 D