How do you calculate BBS?

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How do you calculate BBS?

Example of Beam Reinforcement Calculation:

  1. Length of B1 = clear distance between walls + 2 x width of walls – 2 x bar cover + 2 x bend length.
  2. Length of bar B2: A + B + C = 4000 + 2 x 230 – 2 x 40 + (1.414xH – H)
  3. B2 = 4000 + 2 x 230 – 2 x 40 + (1.414×334 – 334) = 4518.3 = 4520mm.

What is BBS slab?

Bar bending schedule or bbs plays a significant role in estimating the quantity of steel for beams, columns, and slab. It helps to find out bar shape, size, length, weight, bending dimension, etc. In two way slab, the slab is supported by four sides and loads are carried along with both directions.

How is BBS bar length calculated?

1.41. 1.1 How to Calculate the Cutting Length of Spiral Bar or Helix Bar | BBS. 1.41. 1.2 How to Calculate Cutting Length of Bent Up Bar in Slab….Weight of Bar Per Meter (Kg/m) Formula:

Diameter of Bar (mm) Unit weight in kg/m
12 0.889
16 1.580
20 2.469
25 3.858

How do you calculate BBS for continuous beam?

  1. Step 1 – Find cutting length of top bar. Cutting length of top bar = Clear Span of Beam + Development length (Anchorage) Ld on 2 sides – Clear Cover on 2 ends.
  2. Step 2 – Find cutting length of bottom bar.
  3. Step 3 – Find out Number of Stirrups.
  4. Step 4 – Find out cutting length of Each Stirrup.
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How do you calculate the number of reinforcements in a slab?

Firstly, you need to calculate the area of your concrete slab. To do this simply multiply the length of the slab by the width. Now that you have your area calculation, you need to divide the area by 12.5. This will give you the number of steel mesh sheets required to reinforce your concrete slab.

How do you calculate BBS of beam?

Bar Bending Schedule for Simple Beam

  1. Observations.
  2. Step 1 – Find cutting length of top bar.
  3. Step 2 – Find cutting length of bottom bar.
  4. Step 3 – Find out Number of Stirrups.
  5. Step 4 – Find out cutting length of Each Stirrup.
  6. Observations.
  7. Step 1 – Find cutting length of top bar.
  8. Step 2 – Find cutting length of bottom bar.

How do you calculate rebar for a concrete slab?

Layout of Rebar for Concrete Slabs

  1. Convert your longitude measurement into inches: 15 feet x 12 inches per foot = 180 inches.
  2. Divide your result by the spacing measurement: 180 in / 14 in = 12.87 (round up to 13)
  3. Add one rebar to your result: 13 + 1 = 14.
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How does BBS calculate number of bars?

From the given details, the following values are calculated:

  1. Calculation of Number of Main Reinforcement (X- Bars)
  2. Nm = (Y / Spacing of Main Reinforcement) + 1 Eq.1.
  3. Calculation of Number of Distribution Reinforcement (Y-Bars)
  4. Nd = (X/Spacing of Distribution Reinforcement) +1 Eq.2.

How do you calculate cutting length of a slab?

KNOW HOW TO CALCULATE THE CUTTING LENGTH OF BENT UP BARS

  1. Inclined Length = D/(sin 45°) – dD/ (tan 45°)
  2. = (D/0.7071) – (D/1)
  3. = (1D – 0.7071D)/0.7071.
  4. = 0.42 D.

How are BBS stairs calculated?

Staircase Reinforcement Details

  1. No ring requirement = Length / Spacing.
  2. No ring requirement = 1.5 /0.140 = 11 Nos.
  3. Weight of ring = 1.616 x 11 x 0.395 = 7.02 kg ——–(3-1)
  4. Length of Bar = Length of bar +( wall bering + wall bering ) + ( End side L Bend x No of Qty )
  5. 12 mm dia Length of Bar = 1.5 + (0.200 + 0.

How do you calculate the cutting length of a slab?

Cutting length of main bar = Clear span of slab + (2 x development length) + Inclined length – (Bend length) Inclined length 0.42d Where d = diameter of bar. D = Thickness of slab – Both side clear cover (top & bottom) – dia of bar Length of main bar = Ly + 2Ld+ (1 x 0.42d) – (1d x 4) = 2000 + (2 x 40 x 12) + (2 x 0.42 x 88) – (1 x 12 x 4)

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How to calculate bar bending schedule of two way slab?

Bar Bending Schedule Of Two Way Slab: Step 1: For Section A-A. Calculate number of bars required for main bars and distribution bars. No. of bars = Length of slab/spacing + 1. Total No. of bars = Ly/150 +1 = 4000/150 +1 = 27. No. of main bars = 14. No. of distribution bars = 13. Step 2: Calculate cutting length of main bars and distribution bars.

What is BBS of flat slab and estimation of steel quantity?

BBS (bar bending schedule )of flat slab and estimation of Steel quantity, in this topic we know about BBS of flat slab and estimation of steel (reinforcement) quantity used in slab and Thumb Rule for Steel in flat slab and types of slab: flat slab, one way slab and two way slab.

How to calculate the depth of a bent up bar?

For bent up bar add 0.42d in a straight length of the bar where’d’ is the clear depth of beam/slab. (Calculation of bars no’s): first, calculate the number of bars required (main and distribution both).