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**Assumptions For Example**

- There are 2 types of bars in two-way slab: Main Bar & Distribution Bar
- Main Bar Diameter = 10 mm
- Spacing Between Main Bars(C/C distance) = 150 mm
- Distribution Bar Diameter = 8 mm
- Spacing Between Distribution Bars(C/C distance) = 100 mm
- Length of Slab = 6000 mm
- Width of Slab = 3000 mm
- Width of Beam of Slab = 300 mm
- Concrete Cover = 25 mm
- Slab Thickness = 150 mm
- We are using a Steel grade of fe500

**Calculations Procedure**

**Step 1: Calculation of Bar Numbers**

Calculate the number of bars required (main and distribution both).

Number of Main Bars = (Length of Longer Side / Spacing) + 1

=(( 6000/150)+1)

= 41

Number of Distribution Bars = (Length of Shorter Side / Spacing) + 1

= ((3000/100)+1)

= 31**Step 2: Calculation of cutting length of main & distribution bar**

Cutting Length of Main Bar = Clear Span (L) + (2 x Beam Width) – (2 x Con. Cover) + (1 x Inclined Length) – (45° bend x 2)

where L = Clear Span of the Slab ;0.42D = Inclined length (Bend length) ;1d = 45° bends (d is diameter of bar)

First calculate the length of “D“

D = (Thickness) – 2 (Clear cover at Top, Bottom) – Diameter of the bar

D = 150- 2×25 – 10

= 90 mm

Cutting Length of Main Bar = 3000 – 2×300 – 2×50 + 0.42×90 – 2×10

= 2318 mm

Cutting Length of Distribution Bar = Clear Span (L) + (2 x Beam Width) – (2 x Con. Cover) + (1 x Inclined Length) – (45° bend x 2)

where L = Clear Span of the Slab ;0.42D = Inclined length (Bend length) ;1d = 45° bends (d is diameter of bar)

Cutting Length of Distribution Bar = 6000 – 2×300 – 2×50 + 0.42×90 – 2×10

= 5318 mm**Step 3: Calculation of Top Distribution Bar**

Numbers of Top bar for Longer span = [(L/5)/spacing]

= [(3000/5)/100]

= 6

Cutting Length of Top Bar for Longer span = Clear Span + (2 x Ld)

= 6000 + (2 x 40 x 8)

= 6640 mm

Numbers of Top bar for Shorter span = [(L/5)/spacing]

= [(6000/5)/150]

= 8

Cutting Length of Top Bar for Shorter span = Clear Span + (2 x Ld)

= 3000 + (2 x 40 x 10)

= 3800 mm**Step 4: Total Length Calculation**Total Length of Main Bar = (41 x 2318) + (8 x 3800)

= 125438 mm

= 125.438 m = 126 m (approx)

Total Length of Distribution Bar = (31 x 5318) + (6 x 6640)

= 204698 mm

= 204.698 m = 205 m (approx)**Step 5:****Calculation of Steel Weight**

Weight of the bar as per their length and diameter by following the Formula: –

Unit weight formula for kg per metre =(D2/163) × L kg/m

Unit weight for feet per metre = (D2/ 533) × L kg/ft

L is the required length of the Steel bar of Diameter D

Weight of Main Bar = (102/163) x 126

= 77.3 Kg

Weight of Distribution Bar = (82/163) x 205

= 80.5 Kg

**Final Result**

**Total Steel Weight = 77.3 + 80.5 = 157.8 Kg**

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