Thank you so much . It means a lot.

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Thanks for watching 🙏

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Thank you so much for watching.

Thanks for watching

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Axial load will be acting on columns when the column support simply supported beams. The shear forces at the ends of the beams will act as point load on the columns.

Use lsm it's easy

Nice question. See, we got dimension of column as 404mm but we rounded it off to 410mm as a result of which the gross area got changed and also the assumption that Asc=0.01% of Ag will change.

I can upload a video on analysis for uniaxial and biaxial

Nihilist area of individual bar = (pi/4)*Dia^2

Area of steel at any given cross section need to be same. Whether you use 16mm dia or 12mm dia. For Detailing follow the given steps. 1. Keep the lapping staggered i.e not more tha. 50% of steel to be lapped at a point. 2. Stirrup hook to be bent at 135° and should be kept alternate. 3. Lower spacing of stirrup near supports and increased spacing near mid region. You can watch my video on column steel checking but it is in Hindi. kzfaq.info/get/bejne/erJ5gMWGy5rbqqs.html For more details refer is code 13920

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correct.

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Abhishek Tomar area of concrete is gross area minus only area of the main steel bar. Ac= Ag - Asc hope you understand.

Everything Civil thanks.

It will be the reaction from the beam.

It's as per your wish..u can take any.

than u are on the safer side if u design considering the above-mentioned assumption.

Asc was 0.01Ag and Ac was 0.99 Ag. everything was in terms of Ag so i solved the equation for Ag and got AG.

Vishvesh Patel skip to 4:23 I said it has been assumed that the load is ultimate load. Hence partial safety factor is already applied. Thanks for watching.

Thankyou for replying. :)

Vishvesh Patel ö

Consider the shear force from the resting beams as axial force on column.

Value of L will be equal to the effective length of column. in real life it will be distance between slab top and beam bottom. Actually the Pu value is the load carrying capacity of column it will depend upon two things first is concrete and other is steel. so what we do here is Pu = (load carried by concrete)+(load carried by steel) = ( 0.45 fck x Ac ) + (0.87fy Ast)

Sorry for that hehe. Will keep that in mind 😅

You need to know the axial load acting on the column.

It depends upon the total no of bars you are providing in the section. However it should not be less than the size of the biggest aggregate used

You are designing the column so it's your choice whichever dia of bar you want. But don't choose less than 12 mm dia.

@@gauravjha6615 shukriya bhai 👍

Yes. I have taken care of that in all my further videos. Thanks for watching

Thanks for watching. For diameter youu have to choose a size of bar greater than the given two cases. Same for the pitch. In practice 6mm bar is seldom used. Nowadays minimum size for lateral reinforcement in columns is taken as 8mm.

tq for clarifying it

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Increase the size of cross section or reduce length. But in reality length is fixed so you can change cross section.

Rahul Singh in is code it is 5,mm but it should never be less than 6mm maybe there is an error in the code

Ofcourse it can be used but make sure for square columns we use minimum 4bars and circular columns we use min 6bars. This is as per IS456 requirements

Im sorry for the late reply. Steel area is assumed 1% of gross area there fore = Asc = 0.01Ag Area of concrete will be total area of column after deduction of steel area.

Yes they are still manufactured and used. However 6 mm bars are Mild Steel bars and are used for small works like bungalows, temporary structures. they are usually used as distribution steel in chajjas and ties in columns. wherever there is a requirement of HYSD bars 6mm bars are never used.

Yes. Thanks for pointing out the error.

What?

I assume u are asking 1:10 which is D/30 where D is the shorter side of the column. If im wrong please state your doubt clearly.

(π/4)x16² = 201mm² . Here 16 is dia of bar. Hope it helped u.

No

ABHIJIT MISHRA thanks for the concern actually in this problem the give load was already assumed factored load i.e the Fos was already applied

For small sizes of columns one tie is enough to support 8 bars for large column more than 600mm size you need to provide secondary links to hold down the central main bars also.

Bracket ko sirf equation ke right me rakho baki sab terms ko left me leke jao tab solve hoga.

Sir column main 16 dia steel provide hona hai ja 20 dia ka ja fer 12 dia ka j hme kaha se pata chalega hum kese decide kr skte hai

Sir column main 16 dia steel provide hona hai ja 20 dia ka ja fer 12 dia ka j hme kaha se pata chalega hum kese decide kr skte hai

Apke hisab se ap choose kar sakte ho..dia kam rakhoge to no of bars zyada ayege..aur dia badha doge to no of bars kam ho jayege.. Itna dhyan dena kam se kam 4bar ho ek column me koi bhi dia ka.

Thanx sir

Yes. It goes like this if you are constructing a G+4 house you need to have a column of atleast 450X450mm with 8-16mm bars keep reducing the size of column by 50mm and 2nos steel for every 4 floor increase.

So sorry.