Before diving into the topic, I hope you read the basic topics that we have covered already

Contents of the Article

The above posts help a lot to understand the topic much better.

## One way Slab Reinforcement Details

From Drawing (Given Data)

• Slab Size = 6000 x 2500 x 150
• 10mm Main Bars @ 150mm c/c spacing
• 8mm Distribution Bars @ 150mm c/c Spacing
• Slab thickness is 150 mm
• Top Extra Bars â€“ 8mm @ 150 c/c
• Beam Cover â€“ 25 mm

## Bar Bending Schedule for One Way Slab

Step 1 â€“ Find out the total Number of Main Bars & Distribution Bars

• Number of Main Bars = (Length of Longer Side / Spacing) + 1 = (6000/150)+1 = 41 Numbers
• Number of Distribution Bars = (Length of Shorter Side / Spacing) + 1 = (2500/150)+1 = 18 Numbers

Step 2 â€“ Find Out the Cutting Length of Bars (Main bar & Distribution bar)

• Cutting Length of Bar = Clear Span (Lclear) + (2 x Beam Width) â€“ (2 x Concrete Cover) + (1 x Inclined Length) â€“ (45Â° bend x 2)

Therefore, Inclined Length D = 0.42 x d

Where, D = Slab thickness â€“ 2 x Clear Cover â€“ Bar Dia = 150-(2*25)-10 = 90 mm

Inclined Length = 0.42 X 90 = 37.8 mm

• Cutting Length of Main Bar = Â Clear Span (Lclear) + (2 x Beam Width) â€“ (2 x Con. Cover) + (1 x Inclined Length) â€“ (45Â° bend x 2)

= 2500+(2*240)-(2*25)+37.8-20 = 2947.8 mm = 2.95 m

• Cutting Length of Distribution Bar = Â Clear Span (Lclear) â€“ (2 x Con. Cover)= 6000 â€“ 50 = 5950 mm or 5.95 m

Step 3 â€“ Find out the number of Top Extra Rods (for L/4 length)

• Number of Top BarsÂ  = Crank Length (L/4) / Spacing + 1 = ((2500/4)/150)+1 x 2 side = 10 Numbers
• Cutting Length of Top Bars = Same cutting length as distribution bars (5.95 m)
 Description Dia of Bar No of Bars Cutting Length (m) Steel weight per metre Qty (Kg) Main Bar 10 41 2.95 0.62 74.98 Kg Distribution Bars 8 18 5.95 0.40 42.84 Kg Top Extra Bars 10 10 5.95 0.62 36.89 Kg Total 154.71 Kg

For steel, calculation refer â€“ How to calculate the weight of steel bars? post

## Two Way Slab Reinforcement Details

From Drawing

• Slab size â€“ 6000 x 5400 x 150
• 10mm Main Bars @ 150mm C/C spacing
• 10mm Distribution Bars @ 200mm C/C Spacing
• Development Length Ld = 40d
• Top Extra Bar 8mm @ 150 mm c/c (both direction)

## Bar Bending Schedule for Two Way Slab

Step 1 â€“ Find out the Total Number of Main Bars & Distribution Bars

• Number of Main Bars = (Length of Longer Side / Spacing) + 1 = (6000/150)+1 = 41 Numbers
• Number of Distribution Bars = (Length of Shorter Side / Spacing) + 1 =Â (5400/150)+1 = 28 Numbers

Step 2 â€“ Find Out the Cutting Length of Bars

• Cutting Length of Bar = Clear Span (Lclear) + (2 x Beam Width) â€“ (2 x Con. Cover) + (1 x Inclined Length) â€“ (45Â° bend x 2)

Therefore, Inclined Length D = 0.42 x d

Where, D = Slab thickness â€“ 2 Side Clear Cover â€“ Bar Dia = 150 â€“ (2*25) â€“ 10 = 90 mm

Inclined Length = 0.42 X 90 = 37.8 mm

• Cutting Length of Main Bar = Clear Span (Lclear) + (2 x Beam Width) â€“ (2 x Con. Cover) + (1 x Inclined Length) â€“ (45Â° bend x 2)

where 45Â° bend = 1 d

= 5400 + (2*240) -(2*25) + 37.8 â€“ (10*2) = 5847.8 mm = 5.85 m

• Cutting Length of Distribution Bar = Clear Span (Lclear) + (2 x Beam Width) â€“ (2 x Con. Cover) + (1 x Inclined Length) â€“ (45Â° bend x 2)

= 6000 + (2*240) -(2*25) + 37.8 â€“ (10*2) = 6447.8 mm or 6.45 m

Step 3 â€“ Top Extra Rods

a) Number of Top Bars (Longer & Shorter Side)

• Number of Top Bars (Longer Side) = Crank Length (L/5)/ Spacing = (5400/5)/150 = 7.2 = 7 No.s x 2 side = 14 No.s
• Number of Top Bars (Shorter Side) = Crank Length (L/5)/ Spacing = (6000/5)/150 = 8 = 8 No.s x 2 side = 16 No.s

b) Cutting length of Top Bars (Longer & Shorter Side)

• Cutting Length of Top Bars (Longer Side) = 6000 + (2 x Ld) = 6000 + (2 x 40 x 10) = 6800 mm or 6.8 m
• Cutting Length of Top Bars (shorter Side) = 5400 + (2 x Ld) = 5400 + (2 x 40 x 10) = 6200 mm or 6.2 m
 Description Dia of Bar No of Bars Cutting Length Steel weight Per Metre Total Qty (Kg) Main Bar 10 41 5.85 Â 0.62 148.71 Distribution Bars 10 28 6.45 Â 0.62 111.97 Top Bar (Shorter Side Extra Rod) 10 16 6.2 Â 0.62 61.50 Top Bar (Longer Side Extra Rod) 10 14 6.8 Â 0.62 59.02 Total 381 Kg

Happy Learning ðŸ™‚

Bala is a Planning Engineer & he is the author and editor of Civil Planets.