Bar Bending Schedule for footings |Estimation of Reinforcement in footings


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.

 

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 plan for reinforcement 

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)

Bar Bending Schedule for footings

Reinforcement in Combined isolated footing

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)

Reinforcement in Plain footing

 

Bar Bending Schedule for footings (Plain footing)

 

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 

Bar Bending Schedule for footings (Isolated footing)

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

Bar Bending Schedule for footings

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

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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

Bar Bending Schedule for footings

 

Bar Bending Schedule for footings

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

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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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