**How to calculate the cutting length of reinforcement bars in circular R.C.C slab**

Now, let us go through the procedure to find out the cutting length of the bars in a circular slab as shown below.

__Given data :__

__Given data :__

Diameter of the circular slab = 1600mm = 1.6m.

Clear cover for the reinforcement = 25mm.

Rebar diameter = 10mm.

Rebar spacing = 150mm c/c.

The formula for finding the length of the bar

=2√r2 – d2

### Where,

r = [diameter of the slab – (2nos.× clear cover )] ÷ 2

d = c/c distance of the individual bars from the central bar of the circle.

As you can observe in the above-given drawing, I have drawn a red-colored circle by deducting the clear cover. Radius r in the above formula will be the radius of this red circle.

### = **775mm.**

**value of r will be the same**for the cutting length calculation of every individual bar of the slab.

**Note**: All the rebars of the circular slab act as a chord of the red circle. To gain a basic understanding of this theory, you have to go through the article,

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**1. Cutting length of bar cc1**

= diameter of red circle = **1550mm.**

**2. Cutting length of bar DD1**

=2√r2 – d2

Here, d = 150mm.

= 2 × √7752 – 1502

= 2 × √ 600625 – 22500

= 2 × √ 578125

= 2 × 760.345

= 1520.69mm = **1.521m.**

**3. Cutting length of the bar FF1**

Here, d = 300mm.

=2√r2 – d2

= 2 × √ 600625 – 90000

= 2 × √ 510625

= 2 × 714.58

= 1429.16mm = **1.429m.**

**4. Cutting length of the bar GG1**

Here, d = 450mm.

=2√r2 – d2

= 2 × √ 600625 – 202500

= 2 × √ 398125

= 2 × 630.971

= 1261.94mm = **1.261m.**

**5.Cutting length of the bar HH1**

Here, d = 600mm.

=2√r2 – d2

= 2 × √ 600625 – 360000

= 2 × √ 240625

= 2 × 490.535

= 981.07mm = **0.981m.**

**6. Cutting length of the bar JJ1**

Here, d = 750mm.

=2√r2 – d2

= 2 × √ 600625 – 562500

= 2 × √ 38125

= 2 × 195.256

= 390.51mm = **0.39 m**

**OTHER POSTS:**

The calculation should be done until the cumulative value of d is less than r. So, we have calculated the cutting length of **5 bars **on the upper side of the central bar CC1.

__No. of bars in a circular slab __

__No. of bars in a circular slab__

= [ ( 1600mm ) ÷ 150mm] +1

**11 nos.**

**Total no. of bars **

**22nos.**

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**Estimating Of Steel Bar Quantity for Construction**

As the upper half part of the circle is identical to the bottom half part, you will have 2nos of central common bars and 4 nos of the chord bars having the same cutting length.

1. Cutting length of central bar CC1 = 1.55m **👉** 2nos.

2. Cutting length of bar DD1 = 1.521m** 👉** 4nos.

3. Cutting length of bar FF1 = 1.429m** 👉** 4nos.

4. Cutting length of bar GG1 = 1.261m** 👉** 4nos.

5. Cutting length of bar HH1 = 0.981m** 👉** 4nos.

6. Cutting length of bar JJ1 = 0.390m** 👉** 4nos.

————–

### **22nos.**

**Learn More**

**How To Calculate The Cutting Length Of Chair-bar In Footings**

**HOW TO CALCULATE STEEL QUANTITY FOR SLAB WITH BAR BENDING SCHEDULE**

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Land Surveying & Architects

Land Surveying & Architects