Bar Bending schedule plays a vital role in finding the quantities of reinforcement in structure. In order to find out the Bar bending schedule for slab or steel reinforcement in Slab, I recommend you to learn Basics of Bar Bending schedule and how to adopt concrete cover for different components of a building.
Bar Bending Schedule for Slab:-
There are 16 different types of slabs in construction. Well, the thickness of slab generally varies between 4″ to 8″. We generally adopt 6″ (0.15m) slab thickness. For occasionally heavy loads we adopt 8″ and above thickness slabs.
Quantity of Reinforcement (Steel) required for Slab Or Bar Bending Schedule for Slab:-
In this post, I am finding out the Estimation of Steel reinforcement required for a Slab to work on this I considered a plan as shown below.
Primarily slabs are classified into two types One-way Slab and Two-way slab to know more about the differences refer here.
In one-way slab, Main bars are provided in shorter direction (Cranked bars) and distribution bars are provided in Longer direction (Straight bars). Whereas in Two-way slab Main bars (cranked bars) are provided in both directions. Usually, the Two-way slab is adopted when the length and width of the slab is more than 4m.
Well to make you perfect in Bar Bending Schedule for a slab, I am considering a One-way slab and two way slab as shown in the figure. Main bars and distribution bars are provided in the One-way slab. In two way slab, distribution bars are provided in both sides of slab.
Distribution bars:- These bars are straight bars.
Main bars:- These bars are cranked bars. Main bars are cranked at an angle of 45 Degree with the length of 0.42D
Where, D = Depth of Slab- Top cover – Bottom cover
Extra Bars:- The extra bar is provided at the bottom of Cranked bars to maintain the framework of the slab.
The length of Extra bar is L/4.
Steps to calculate the Reinforcement required for Slab:-
- Deduct the cover for finding length of bar.
- Evaluate the length of the distribution bar
- Calculate the Value of ‘D’ (Depth of slab- Top cover- Bottom cover)
- Find out the No. of Bars
- Compute the Total wt of steel required for slab reinforcement.
Dia of bars = 10mm , Spacing between bars = 0.10m , Depth of Slab = 0.15m
Floor Slab – 1 (Two-Way Slab):-
Bars along X Axis:-
Bars along Y Axis:-
Total wt of Bars = 150.285+150.091 = 300.376Kgs
For Floor slab -2 (One way slab) :-
As per the above figure Floor slab -2 is a One way slab. In this kind of slab Mains bars (cranked bars) are provided in shorter direction hence there is no need of calculating the crank bar length in Y-direction (from fig). Evaluate the length of Bar as given in the figure by deducting the covering length. Whereas in X Direction Crank bar length is considered.
Bar Bending schedule for Neck column [BBS]
Bar Bending schedule for Tie beams/strap beams [BBS]
Bar Bending Schedule for Footings [BBS]
Basics of Bar Bending Schedule [BBS]
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I am regular reader cum learner of your blogs. I feel so lucky to be subscriber of such a good broadcast, keep sharing such valuable knowledge as we are eager to learn.
It is helping me to add knowledge in myself and giving me ideas to work on sites too. I am waiting to work in a construction field now a days. Since these days I am working in Facility Management.
Thank you very much!
thanks for ur appreciation it means a lot
can u blog on estimation of overhead tank bro
soon you can expect this to be posted. Will add into my list
Bro ur doing good work carry on
nice stuff for us for our knowledge ,
thanks for this posting ,
Its very informative. I am regular learner. the way you explaining things its easy to understand anyone .keep going. Best luck
Thanks for ur appreciation.
Brother U doing great job . I am a regular reader of yr blogs it full of knowledge as i am in final year of my civil engineering course it gives my knowledge a boost?Thnks once again and keep adding more topics?
Thanks for ur Inputs.
Very very thanks bg
This information are more useful for me
Thank you for sharing knowledge… 🙂
Thanks sir for shearing ur knowledge
Why u took L=3.950 and 4.150
Deduct concrete covering
which length u are referring to ?
Can u upload the bar bending schedule for floor columns too? All the articles are really informative and simple. Thanks.
bar bending schedule till neck column was already posted and same procedure applies for floor columns too you can search in site
Can you pls bar bending schedule for columns and beam
Bar Bending Schedule for Neck column
Above article is upto neck column where the process is similar for floor column but increase depth of column
Bar Bending Schedule for Tie beams
Thank u share
Don,t estimate the power of civil engg Boss. You r the real Boss of estimaton. God bless u
Please Sir, Can you give note on environmental exposure conditions for various cities like Goa, Chennai, Kolkata, Delhi, Jammu, Mumbai, Pune, Bhopal for cement concreting?
Sir please tell me how to calculate wood quantity
Thank u so much
It helped me in my own house construction
Very thanks Krishna ji