Bar Bending Schedule for footings / Estimation of Steel reinforcement in footings:-
Bar Bending schedule plays a vital role in the construction of High rise buildings. It is very important to learn Bar Bending Schedule for finding out the quantities of Steel reinforcement required for every component of the building.
For Suppose, consider the case of high rise buildings, It requires tons of steel to complete 10+ floor building. It’s impossible to order all the steel required for whole construction at a time it creates a problem of space and also steel is prone to corrosion by the contact of water (rain). To avoid this, high rise building orders reinforcement (steel) as per requirement. Firstly they find the Estimation of Steel reinforcement in footings (steel quantities) [Bar Bending Schedule for footings], required for the construction of footings. After the completion of footings they go for next order and so on.
Contents
- Quantity of Reinforcement (Steel) required for footings / Bar Bending Schedule for footings:-
- Footings F1, F4, F7:- (Plain Footings) or Bar Bending Schedule for Plain footings:-
- Footings F3, F8 (Isolated footings) or Bar Bending Schedule for Isolated footings :-
- Footings F2 (Step footings) or Bar Bending Sschedule for Stepped footings:-
- Footing F5 (Eccentric footing) or Bar Bending Schedule of Eccentric/Shoe footings :-
- User Review
Quantity of Reinforcement (Steel) required for footings / Bar Bending Schedule for footings:-
In this post, I am finding out the Estimation of Steel reinforcement in footings / Bar Bending Schedule for footings. For this, I considered a footing plan as below.
Steps for Finding the quantities of Reinforcement in footing:
Step 1: Identify the type of Mesh or Reinforcement
Step 2: Adopt dia of bars (X bars & Y bars)
Step 3: Deduct the Concrete Cover from all sides of footings
Step 4: Find the length of bars (X bars & Y bars)
Step 5: Find the No. of Bars
Step 6: Find the total length of bars
Step 7: Result: total wt of bars required for footing
Footing Details:-
F1, F4, F7 is Plain footing (1.5×1.5×0.8)
F2 is Stepped Footing (0.9×0.9×1.35)
F3, F8 is Isolated footing (0.9×0.9×0.5)
F5 is Combined Isolated footing (4.4×1.9×0.9)
(In this article I didnt added the details of above footing F5)
F6 is Shoe footing similar to Plain footing (1.5×1.5×0.8)
We use different types of mesh (reinforcement) in footings as per design. You can refer different types of Reinforcement used in footings from here.
Footings F1, F4, F7:- (Plain Footings) or Bar Bending Schedule for Plain footings:-
Plain mesh is adopted for F1, F4, F7 footings
*Remember, Proper Concrete cover should be adopted for the reinforcement in Footings to resist it from corrosion.
The dimensions of Footing F1 are 1.0 x 1.0 x 0.9 (Length x Breadth x Depth)
Adopt Dia 16mm @ 100mm C/C in X Bars
Adopt Dia 12mm @ 100mm C/C in Y bars
Finding the length of X bars and Y bars (X bars are Horizontal bars and Y bars are Vertical Bars)
To find out the length of bars we have to deduct the cover from footing (Refer Fig.1)
As per the condition the concrete cover for the mesh is 0.1 from all the sides of footing
So, The length of X bar is 0.8 and Length of Y bar is 0.8. (Deduct 0.1 from both sides)
Footings F3, F8 (Isolated footings) or Bar Bending Schedule for Isolated footings :-
Hook Mesh is used in Isolated footings
Remember Proper Concrete cover should be adopted for the reinforcement in Footings to resist it from corrosion.
The dimensions of Footing F3, F8 are 0.9 x 0.9 x 0.5 (Length x Breadth x Depth)
Adopt Dia 16mm @ 100mm C/C in X Bars
Adopt Dia 12mm @ 90mm C/C in Y bars
Finding the length of X bars and Y bars (X bars are Horizontal bars and Y bars are Vertical Bars)
As per the condition the concrete cover for the mesh is 0.1 from all the sides of footing
So. The length of X bar is 0.7 and Length of Y bar is 0.7. (Deduct 0.1 from both sides)
Remember , Hook length = 9D
Length of Bars: –
Length of X bar = L+9D+9D = L+18D = 0.7+18 x 0.016 = 0.988m
Length of Y bar = L+9D+9D = L+18D = 0.7 + 18 x 0.012 = 0.916m
Footings F2 (Step footings) or Bar Bending Sschedule for Stepped footings:-
Hook Mesh is used in Step footing.
The dimensions of Footing F2 are (0.9×0.9×1.35)
Adopt Dia 16mm @ 110mm C/C in X Bars
Adopt Dia 20mm @ 115mm C/C in Y bars
Finding the length of X bars and Y bars (X bars are Horizontal bars and Y bars are Vertical Bars)
As per the condition the concrete cover for the mesh is 0.1 from all the sides of footing
So. The length of X bar is 0.7 and Length of Y bar is 0.7. (Deduct 0.1 from both sides)
Remember , Hook length = 9D
Length of X bar = L+9D+9D = L+18D = 0.7+18 x 0.016 = 0.988m
Length of Y bar = L+9D+9D = L+18D = 0.7 + 18 x 0.012 = 0.916m
Footing F5 (Eccentric footing) or Bar Bending Schedule of Eccentric/Shoe footings :-
Type of Mesh :- Upto the depth of footing
The dimensions of Footing F5 are (0.6×0.6×0.4)
Adopt Dia 16mm @80mm X Bars
Adopt Dia 16mm @ 80mm in Y bars
Finding the length of X bars and Y bars (X bars are Horizontal bars and Y bars are Vertical Bars)
As per the condition the concrete cover for the mesh is 0.1 from all the sides of footing
So. The length of X bar is 0.4 and Length of Y bar is 0.4 (Deduct 0.1 from both sides)
Length of X bar = 0.3+0.4+0.3 = 1.0m
Length of Y bar = 0.3+0.4+0.3 = 1.0m
Total Steel Required for Footings = 89.13 + 67.32 = 157Kgs.= 0.157ton
Coming soon estimation steel reinforcement in Columns, Slabs, Septic tank, Water tank. Stay tuned by like’ing us on Facebook
You can also read:-
10 Types of footings or foundations which we adopt in Construction
16 Different types of slabs in construction
Different types of Columns in construction
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Amresh Killa
Well done bro keep going
krishna
Thanks for ur inputs
Varun
Good job Krishna ji it’s very helpful
Rama
well done..you made my day…Thanks..hoping to see upcoming detail estimation of slab and beam reinforcement
Rama
dimension of footing is 1.5×1.5×0.9, but used 1 instead of 1.5,can you pls explain…anyway I appreciate your work.
Md Azharuddin
Excellent….
Md. Aminul Islam, Dhaka Bangladesh a
Excellent infformation. Thanks a lots
Farhad
Excellent information a lot of tnx,I learn a lot of knowledge
Thirugnanam
Very nice contribution to civil construction.
Ravichandran
Thanks For Wonderfull Information , keep giving Ideas of Footing and About Pile foundation Details , Can help a lot, Ravichandran p
Mohammed Tausif Moinuddin
I heartily Thanks for your sir for very good information
Krishna
thanks for ur words! Join our dedicated civil engineers forum let help each other
link: forum.civilread.com
Reneeja
I lyk dis site.. Add more
tayyab
thank you dear for your all information’s stay blessed
Pawan
Hiii actually I want to know that which size of steel bar is used for footing purpose for g+4
Krishna
it depends on design usually we use 10mm-12mm
Oluwaseun
Hi Krishna, u’re doing a great job here, keep it up. Please I will like to know the design code or a textbook to consult to get info such as the hook length for footing(9D), weight of 1m steel(D2/162) to reinforced my conviction about what I read here. Thanks
omkar
Good job ji it’s very helpful
ashok
i dnt know english pls send in telugu
Krishna
use google translate 🙂
Najeer Khan
Thanks for informing
Ashok jana
How to process calculation bar quantity any pile or mat foundation.
Krishna
go through the article clearly
Fousan p
plane footing cutting length and depth ofstepped footing is wrong pls try to correct it
Krishna
All values mentioned are for understanding the concept and these values cant be used for design purpose.
Aditya
very Nice Information Thanks Buddy
mohammed
why r u taking +1 in no of bars in x and y calculation
Krishna
its a formula
ADITHYA LATCHIREDDI
There is have any deductions in a calculation of cutting length for rebars in any structural units like slabs ,beams columns and footings …if there is any deductions please explain .
Krishna
the deductions and the complete design of slabs, beams , columns are explained clearly here
https://civilread.com/tag/bar-bending-schedule