DESIGN OF TWO WAY SLABS | IS 456 | Limit State Method | Mumbai University

[@vijaykant007]

There is error in load calculation for per meter

[@EverythingCivil]

Can u tell me more about it? Thanks.

[@vijaykant007]

In load calculation step, for calculation for load per meter it will be multiplied by one meter with total load but you divided.

[@EverythingCivil]

Yes you got the point correct thanks that's an error. Will pin down your comment so that others can see.

[@shabajkhan1916]

How did you take aspects ratio?

[@divyanshdeep3941]

@@civilshorts13754 bhaang khaye ho kya.. l(y)/l(x) hota hai

[@anirudhkorgaonkar941]

NO intro NO background music NO glamour just PURE skill and knowledge of teaching thank you sir have a good day

[@sahilarora5983]

YOU TEACH VERY WELL BRO....KEEP IT UP ! GOD BLESS U

[@EverythingCivil]

Thank u so much. Pls share with ur friends.

[@mebinglapung3405]

Your teaching is just awesome...I hope you upload more of the videos regarding civil engineering subjects

[@jp4mahajan]

Very good example to explain two way simply supported slab ,thanks for your effort.

[@jp4mahajan]

Two way simply supported slab explained in a very nice manner. Thanks and keep it up.

[@EverythingCivil]

Thanks dear. Keep supporting ❤️

[@arishfurkhan3911]

thanks bro....you helped me to pass exam after a long time....awww bhai shukriyaa🤗❤

[@paarthsharma15]

very well explained . Concept and language fluency is really good. May god Bless you with loads of happiness and good fortune ahead. all the best.

[@EverythingCivil]

Thanks for watching.

[@ashutoshcheke7547]

@@EverythingCivil how did you calculate aspect ration

[@EverythingCivil]

@@ashutoshcheke7547 aspect ratio is longer side/shorter side of slab. ly/lx Can u pls tell what you want to know?

[@sunilgohel8504]

Excellent explanation sir. All your videos are worth seeing

[@kajalnimgade]

Thanks sir 😊😊😊i hope we get 20marks on that ques. 😀

[@mrkalyan2070]

Kajal nimgade only 14 marks per answer😅

[@suryapraveen7381]

hi

[@ajinkyakshirsagar1691]

Very sincere efforts... Nice job bro... Keep it up!

[@EverythingCivil]

Thanks

[@V4Angels]

What about BM COEFF for 4 sides with torsion provision T-26? You took COEFF from T-27 why? What aboutmiddle strip calculation, can you tell? In depth calculation, span to depth is 28 for SS and 32 for Fixed or continuous. If we consider 20x1.5=30 does it satisfy that condition? And, why you multiple with MF as 1.5? It's not for FOS.. Overall nice explanations glad to hear in reply with above answers from asap . Thank you.

[@jayasingh3233]

LX + half of width of support is taken in calculating if it is not given we assume the width of support

[@amanprince2009]

Thanks u.very clearly u have explained all things.👍

[@balaspeaks1584]

You are great teacher brother ❤

[@SunDrops2730]

Span/depth ratio jo apne bataya wo beam ka h ya slab ka? Beam ka alag hota h n slab ka alag hota as per code.

[@shrikantdeshmukh6337]

It was the best explanation ever...great efforts taken by you But there is problem in calculation we calculated moment in X direction=48.68 And at the time of calculating steel we took 46.68?

[@EverythingCivil]

Yes I'm sorry for that error. I hope you understood the design step.

[@EverythingCivil]

You will have to interpolate bro.

[@shrikantdeshmukh6337]

@@EverythingCivil yes and i have followed same design steps in exam as well...thanx for the video

[@richieerich_]

I have one doubt.....at 13.32 u have written ( 200 - 25 - 6 - 6 ) don't u think one of them should be 12 becoz it's the diameter of bar we're taking??

[@richieerich_]

One more thing.....while calculating the value of total depth ( D = d.eff + d.cover + Dia of rod/2 ) but u haven't written the value of dia/2 ?? Could u please explain??

[@naveenmeena3184]

Thanx buddy ...you made things easier ...

[@sanjayborge2240]

sir I didnt understand in the shorter span the distance 467mm from the support , where this come from?and why please explain .thank you and regards.

[@parasbambah4770]

Please tell me about minimum dia of bars to be provided in slabs,beams,columns ( means not less than that)

[@EverythingCivil]

Minimum diameters Slab - 8mm Beams - 10 mm Columns - 12 mm Thanks for watching

[@parasbambah4770]

Everything Civil Thanks

[@Vikas-kf5ys]

At 7:30 duration the αx and αy values is not get by Interplotation ?

[@relaxgamer_Chris]

AT 13.28 while calculating eff.depth in y direction how come you are taking 6mm for the rod in x direction its 12mm rod for y direction 6mm its of half of the rod. i think you need to take 200-25-12-6 = 157mm. please explain.

[@AmitKumar-yt8kv]

Sir, your method of teaching is so impressive, and thax for this, but how to get 800 of Ast because you chose wrong value 46.68 , pls confirm

[@sonukumar-bp4wb]

Yes wrong calculation

[@jahangirkhan-rw6th]

While calculating Mx value you put effective length value ...But in formula it is Shorter span ...Correct me if i am wrong

[@utterlygood7034]

Hey can you explain how you have decided about slab that it is restrained or unrestrained..... As in question it is mentioned that monolithic construction is done so I think it would the case of torsionally restrained slab in which "all the four edges are discountinuous "I.e simply supported, this should be as per table 26 of is456:2000, case number 9....please tell me as soon as possible

[@aamir.durrany]

Simple. At any corner where either or both the edges are discontinuous, torsion reinforcement has to be provided. It has nothing to do with monolithic casting.

[@utterlygood7034]

@@aamir.durrany it is mention in question that the slab is simply supported from all tha 4 edges ... What does it mean.... Actually I am confused in unrestrained slab and restrained slab (case: 9 of IS 456:2000) in case 9 it is mentioned that when slab is simply supported from all edges(discontinuous)) If we designed it as restrained slab then we have to provide torsion r/f else not and coeff. Too are different

[@aamir.durrany]

@@utterlygood7034 A "Simply Supported Edge" means there's no other slab beyond that edge. Such edge is also called a "discontinuous edge". In the question it is mentioned that all 4 edges are simply supported (discontinuous). That means the slab is just one single slab as it is discontinuous beyond all of its 4 edges. Torsion bars, by default, need to be provided in those corners where either or both the edges meeting at that corner are discontinuous. (Unless they mention specially in question to treat the slab as Unrestrained, in that situation we won't provide torsion bars in any corner). In this example, all the corners satisfy the condition for torsion bars. Also the question didn't tell us to treat the slab as unrestrained. So we provide torsion bars in all corners. Now, the condition when Table 27 is used: Table 27 is used when 2 conditions are satisfied. It is used in only those cases where all the edges of that slab are discontinuous, AND torsional reinforcement is not required to be provided in any corner. For all the other cases we use table 26. The example in the question does not satisfy the 2nd condition for table 27. Had they mentioned to treat the slab as Unrestrained, the 2nd condition would then have been satisfied and we would have used table 27. But in this question, we will use table 26, case 9. He should have used table 26. Hope this helps.

[@utterlygood7034]

Yeah! The coeff should be as per 26 and not as per 27,Anyways Thank you very much!!

[@amrendshah5094]

good explanation sir. please upload one complete residential building design video.

[@saradakonuri5746]

sir please draw and explain reinforcement details. I can't understand and where you get the 280mm spacing.

[@michaelnibret9446]

thank you sir it is very clear explanation ,but can you also explain about the techniques how to distribute the moment on the two way slab, on column strips and middle strips?

[@pankajbhoyar9207]

Very good brother 🤗 all'the best

[@sakshamgupta129]

thankyou sir (

[@EverythingCivil]

No dear.

[@pegionlover5484]

in the sum no need of torsion reinforcement and we take the bending moment value at table 26 page no is 91 as per code book , and in question monolithically all side simple supported so we take table 26

[@pegionlover5484]

replies fast

[@pegionlover5484]

please provide the check for depth

[@akshayverma1828]

shouldn't depht in case of y be 157 mm? because you subtracted the radius and i guess dia should have been subtracted

[@sankaranandh.R]

Really well explained.👌👌👍

[@revanthmunagala3905]

moment at x direction is 48.68..but @ 10:05 u have taken it as 46.68....

[@kickvenkatvenkat9978]

We have bend to upward in the LX and ly direction what is that length and how to find that length. Remaining else is very clear thank you.

[@EverythingCivil]

I can give u detailed drawing of the bending procedure. Please mail me at [e-mail]

[@Nitesh_Stock]

Excellent man.. well explained.

[@sidtech3167]

Very well done solutions with proper explanation i would like to contact with u What's your name brother....i am preparing for competitive exam..make vdo on soil mechanics also please 🤗🤗🤗🤗

[@rabbaniubedullahkhan7667]

Can u tell me how the Ast formula u took??? Tell me the link of derivativion of Astx formula you used. Coz the Annexure G contains different formula for Ast

[@jakishsheikh949]

Well simplified brother, CHEERS from NITM

[@riteshgurung430]

Sir, I am confused whether to to calculate deflection , shear, ld, distribution steel in two way slab ? should i need to check ! and please explain the length calculation as shown in figure for bentup bar Thank you sir for this vedio

[@EverythingCivil]

Yes you need to check for everything you mentioned.

[@sweetrascal3980]

If you are design for two way slab then how can you take your basic value as 20. refer IS 456 page no.39, B.V is 35 for 2way slab and you need to multiple it with ratio of 0.8 because of using Fe415, for modification factor we have to refer SP16 page no.10 table E. Effective depth = span / (B.V × M.F × 0.8)

[@jassi7491]

Bro that is for spans upto 3.5m only. Above that u have to use as done in video

[@abhishekganoil8011]

Pretty neat explanation. Keep up

[@jusrandom6025]

Why didn't you use table 26 for alpha x and alpha y calculation sir?

[@avinashprasad3755]

Bro, Kay slab ko 3/4 mid span me Nahi divide karoge ,why pls explain

[@nuthakkinageshbabu2743]

Simply supported on all four edges with held this is the condition... Which values are taken sir

[@izhar5914]

Hey. The shorter Spam which is Lx is 4.5m according to the question. In the solution, You are taking it as 4.675m. Can I know why?

[@aamir.durrany]

4.5 is the clear span and 4.675 is the effective span. We use effective span value in all calculations.

[@sateeshpotnuru7056]

in calculations we have taken b as 1000 mm means we are considering for 1 metre width ? please clarify

[@EverythingCivil]

Yes dear you are absolutely correct.

[@karjonmara8906]

What is torr you keep telling?

[@NavjotSingh-qd2is]

Very nyc sr bt agr diagram v step se bnaate toh👌👌

[@BPNC3]

In the question its given in addition to self weight the load is 10kn/m^2. Then why to take again self.. In load calcution?in the video its at 5.00min....expain...plz

[@EverythingCivil]

Hello. You misunderstood the question. It says it has to carry a load of 10Kn/m2 in addition to ( inlcuding ) its self wt. It basically means you have to add the self wt. Hope it helps, extra load was not added in the numerical. Pls remember total load on slab = DL(self wt + floor finish) + LL Thanks

[@BPNC3]

@@EverythingCivil thank you

[@Ahuja5886]

Hey bro...you have explained it very good..but how to provide Bent up bars....plz explain..

[@EverythingCivil]

Patel Jigar In beam or in slabs?

[@Ahuja5886]

Everything Civil ..bro...in slab..

[@EverythingCivil]

Sorry for the late reply! In slabs bent up bars are provided along the shorter span in case of one way slab and along both spans in case of two way slabs. Bent up bars are provided alternately and carried upto a distance of L(span)/3 into the next support.

[@garvsaini9160]

Great video! But please explain how to calculate the number of bars required and total number of bars

[@EverythingCivil]

I have made a video on cutting length of slab. kzbin.info/www/bejne/e16zgaGZnNureK8

[@SARVAMSUPREMEFLOW]

Perfect💯👍👏

[@_SivavigneshNS]

actually the information are so good .

[@EverythingCivil]

I m glad you liked it.

[@pankajbhoyar9207]

Plz have a session on design of retaining wall

[@hareeshmuthu5412]

At last for torsion the if the minimum spacing is 3d

[@faizahemad913]

basic value of l/d ratio for two way slab for simply supported is 35. you have considered 20 which is for one way slab...

[@ABHI-pg8wx]

Sir simply supported two way slab always provide torsion ah?...or not... On qn given na find torsion?...

[@nbasavaraj4439]

For slabs 12mm is heavy rod I think. Is it OK. For which purpose this type used.

[@vkvijaymsamy]

if spacing of bars comes in decimal it should be round up to lesser number.example if spacing is 130.33mm it should be round up to 130 or less of that value as 125mm.

[@Rajpoot_A.S]

Hey in the two-way slab where would provide distribution bars? as we provide in one-way slab.

[@aamir.durrany]

There's no distribution bars in 2 way slabs. All the bars are main bars.

[@maulikpatel4015]

for longer span, in My why value of Lx is taken?? why not Ly? Ly give more moment than Lx

[@EverythingCivil]

It's done as per the formula given in the code. As for your question why longer span the answer is the coefficients have been derived by considering only lx for simplicity. Even though if you take lx but multiply by alphay you will get moment along My only.

[@kodatisuryasomeswarrao6755]

in continuous slab panels, the reinforcing details over support of one side twoway slab and other side oneway slab of short span parallel to support. how redistribution of moment are to be done, there because longer span have zero moments (in oneway slab) except mimimum steel of 0.12%

[@rajrishi7433]

In simply supported condition of two way slab i think there is no provision of providing torsional reinforcement..it is for the restrained condition when corners are held down???!!!????

[@mshippergi6109]

how to provide edge stirrups ( l/8 ratio) ?

[@sheelkumarjatav1310]

Ast in X dir is 800 mm2 Is this value is right according to the minimum reinforcement criteria for this slab ... Please cross check And explain...

[@nagendrasingh9781]

Sir modification factor kaise lena hai MF lene ke kya criteria hai Sir please bataye

[@pankajdwivedi3009]

Some more steps like check for shear are not explained in this video

[@aamir.durrany]

Check for shear is generally not required

[@psantoshkumar5858]

Good explained sir...

[@rexyadav5180]

If the edges are monolithically casted with beam that makes it a restrained slab.

[@bishowregmi7262]

Just wanna ask if a continuous slab has 1m cantilever slab at discontinue edge will it be interior slab or discontinue slab

[@civilengineeringbasic]

Hello sir I have a slab area of 12'*12' . And while comparing from structural drawing I got less reinforcement as compare to then. Why it is so..... Can you explain me

[@deepakjha4087]

Hlo sir..u haven't shown calculation of ly...can u explain?? And without ly..how can u find the value of alpha x

[@yaqubabidi3370]

Sir ,can you pls tell me how you calculated "d" in check for depth

[@gopalreddy5349]

For under reinforced sections the actual depth is greater than balanced depth

[@jacstewart9228]

Does two way slab can be continuous

[@EverythingCivil]

Yes it can be..

[@cherithhurdaisirigiri5584]

Sir how did you get the value for calculation of steel on longer span as. 446 as i did in the calaulator im getiing a error so can you help me out on this

[@aamirkhan3710]

Sir effective depth longer span mei jo aap do baar 6 deduct kiya usko please explain karei

[@EverythingCivil]

longer span ka steel uper layer me hota hai to sabse pehle maine effective depth 1st layer ka liya jo bar ke center tak hota hai. fir second layer ke center ke liye pehle 6mm 1st layer ka aur 6mm upar ke layer ka.

[@aamirkhan3710]

Everything Civil Thx

[@mrinalpandit8730]

@@EverythingCivil sir, For effective depth of longer span shouldn't be taken as (200-25-12-6)? Because for the center of upper layer of the bar we must deduct its radius ,lower bars' diameter and clear cover.

[@theredrock3663]

Don't we have to check for deflection?

[@channelone8781]

Hello sir...how to calculate floor finish......plz tell me importnt

[@aamir.durrany]

We assume it as 1KN/m2

[@ONSPOTTRAVEL]

Calculation of steel which clause

[@Dailymotovlogs]

Plz explain about curtailment also.

[@bhavirisettibhanukiran6467]

Nice boss&tq

[@sanjeevreddy1756]

Torsion r/f will be only for s.s? Or fixed also?

[@EverythingCivil]

When the corners are restrained against uplifting we provide torsion rf , whether it is one way or two way or SS or fixed slab. For eg at corner if there is a column resting on the slab it will be restrained against uplifting.

[@divyanshdeep3941]

While taking D you haven't added half of main bar diameter with effective D and cover.

[@vamsikrishkonidela8029]

sir what is design difference between one way and two way slab n design point of view

[@EverythingCivil]

Major difference is the way of bending..one way slab bends in only shorter direction hence main steel is provided on shorter span. In two way slabs bending takes place in both the direction hence steel is provided in both span.

[@Doitmoreandmore]

D=d+clear cover+pi by 2 (correct)

[@wizardthil5533]

sir can u please tell how u got the formula of Ast ?

[@sachinrajeev44]

wizard thil bro did u find it? I am still searching

[@gebaete2597]

@@sachinrajeev44 Bro,the formula for finding out the area of steel is given in the Codebook (IS:456:2000). Page no-96.

[@roydebraj0342]

Part 4 me moment nekale ke leya w=22.5 leya geya hai....but iska to total load hai 15kn/m ..22.5 kaha se ati ha ?

[@syedhaseeb4638]

What is meant by restrained at corners

[@aamir.durrany]

It means torsion reinforcement has to be provided.

[@niloferbano8684]

How to find l effective when support is given

[@EverythingCivil]

Distance between centre of both supports will be l effective

[@chinnac6389]

Bro , add design of water tank ( rectangular & circual ) and design of stair case , also

[@EverythingCivil]

Design of staircase problem. : kzbin.info/www/bejne/r5C1f35jYrmlbcU Water tank will be uploaded soon.

[@chinnac6389]

Sorry I mean , what was difference between deep well stair case , dog legged stair case & circular stair ( in design steps)

[@chinnac6389]

Which steps we have to use for different type of stair case

[@EverythingCivil]

This mehod is only applicable to staircases supported on rectangular slab such as dog legged staircase.

[@EverythingCivil]

Design of water tank added

[@tasaduqtahseen6458]

What about the Calculation of shear force And development length Plz reply

[@aqireenzaqilah]

Is it a drop? How to calculate drop?

[@OnlineToBrain]

In total load calculation you got mistake. When you multiply then you will get Kn/m according to your arrangement it Kn/m3

[@praveenchary2519]

No mistake..it's 1 m lenth ...

[@praveenchary2519]

B is 1m,D is m.. density is KN/M3..now load will be kn/m

[@naveenprajapati1121]

In Question you have taken Fck M30 grade of concrete and you have taken M25 in checking for depth

[@jahangirkhan-rw6th]

Sir Kindly upload this video in FPs system as in Paksitan qe are using Foot inches system...

[@shadabjagirdar15]

What about reinforcement in eedge stripup calclution??

[@vasachisenjubean5944]

*didn't say anything about the size of the centre mesh consisting of main and distributor bars, cranking length and other dimensions*

[@indradiptochatterjee2628]

you should consider bearing of 100-150mm in the beginning.