Calculate Bar Bending Schedule for One Way Slab  Steel Quantity for One Way Slab
Bar bending schedules are vital in determining the quantities of reinforcement used in steel or concrete slabs. To find out bar bending schedules of slabs, you should learn first Bar Bending Schedule Formula or Basics of Bar Bending Schedule and how to use concrete covers. We will also discuss about the rebar for concrete slab calculator, calculation formula, calculate rebar spacing, slab of steel quantity, reinforcement bbs bar bending schedule for slab and many more. steel quantity for one way slab
Bar Bending Schedule for Slab:
In construction, there are 16 different slab varieties. Well, the thickness of a slab typically ranges from 4 to 8 inches. Generally, our slabs are 6′′ (0.15m) thick. We use slabs that are 8′′ and over in thickness for occasional heavy loads.
Before calculating the BBS of One Way Slab, we should know about the function and detail of one way slab; rebar for concrete slab calculator
One Way Slab:
One way slabs are those in which the ratio of longer spans (L) to shorter spans (B) is equal to or greater than 2. In a oneway slab, the load is carried in one direction, where main bars are designed, and in the opposite direction, where thin bars—known as distribution bars—are used instead of main bars to distribute the load.
One way slab = Longer span / shorter span > 2 rebar for concrete slab calculator
Reinforcement Required for Steel Quantity of One Way Slab & Two Way Slab:
Generally, slabs are classified into two types Oneway Slab and Twoway slab, In oneway slab, Main bars run in the shorter direction (called Cranked bars) and distribution bars run in the longer direction (called Straight bars). In twoway slabs, Main bars are available in both directions. construction
Bars used in One Way Slab:
Distribution bars:
These bars are straight bars. construction
Main bars:
These bars have a crank. The main bars have a length of 0.42D and are cranked at a 45degree angle. rebar for concrete slab calculator
Where, D = Depth of Slab Top cover – Bottom cover
Extra Bars:
To maintain the slab’s structural stability, an additional bar is provided at the bottom of the Cranked bars. rebar calculation formula
L/4 is the length of the Extra bar. rebar calculation formula
Steps to calculate the Reinforcement required for Slab:
 Subtract the slab clear cover from the distribution and main bar length calculations.
 Determine the value of “D” (Depth of slab Top cover Bottom cover)
 Calculate the number of bars. rebar calculation formula
 Calculate the overall steel weight needed for slab reinforcement.
Bar Bending Schedule for One Way Slab:
One way slab Reinforcement Detail:
Given Data: rebar spacing calculator
 Cranked bars or Main bar of diameter 16 mm and C/C spacing 150 mm.
 Distribution bars of diameter 12 mm and C/C spacing 150 mm.
 Top and bottom slab clear cover is 25 mm.
 Side clear cover of RCC slab is 25 mm
 Thickness of RCC slab is 150 mm.
 Length of RCC slab is 6000 mm (longest side along beam)
 Width of slab (Clear Span) without beam is 3000 mm. (shortest side which is perpendicular to beam) rebar spacing calculator
 Length of top extra bars = L/4 = 3000/4 = 750 mm
 No. of top extra bars = No. of Main bars
 Diameter of top extra bars rebar spacing calculator
Now,
For Main bars:
Step 1: Calculate numbers of main rods.
No. of Main Bars = (Length of Slab)/ Spacing + 1
No. of Main Bars = (6000)/150 + 1
No. of Main Bars = 40 + 1
No. of Main Bars = 41 Nos. calculate rebar for slab
Step 2: Calculate cutting length of one main rods.
Cutting length of one crank bar = Clear span of slab + ( 2 x Development Length) + (1 x inclined length) – (2 x 45 Bend) calculate rebar for slab
Cutting length of crank bars = 3000 + ( 2 x 40d) + (1 x 0.42D) – (2 x 1d)
(Development length = 40d, inclined length = 0.42D, 45 Bend= 1d)
Where, Slab Bar Bending Schedule
D = Thickness of slab – 2 x Side clear cover – diameter of bars
D = 150 – 2 x 25 – 16 = 84 mm calculate rebar for slab
D = 84 mm steel calculation formula
Cutting length of one crank bars = 3000 + ( 2 x 40 x 16) + (1 x 0.42 x 84) – (2 x 16)
Cutting length of one crank bars = 3000 + 1280 + 35.28 + 32
Cutting length of one crank bars = 4347.28 mm
Step 3: Calculate Total length of main rods.
Therefore Total length of crank bars = Length of one crank bar x No. of crank bars
Total length of crank bars = 4347.28 x 41 = 178238.48 mm
Total length of crank bars = 178.238 meter. steel calculation formula
Step 4: Calculate total weight of main rods.
W1 = (d2 / 162.25) x Length
W1 = (162 / 162.25) x 178.238 steel calculation formula
W1 = 281.23 Kg
For Distribution bars:
Step 1: – Calculate numbers of distribution rods.
No. of Main bars = (Width of Slab/Spacing) + 1
No. of Main bars = (3000)/150 + 1 bar bending schedule for slab
No. of Main bars = 20 + 1 = 21 Nos. distribution bars cutting length
Step 2:– Calculate cutting length of one distribution bar.
Cutting length of one distribution bar = Length of Slab + 2 x development length
Cutting length of one distribution bar = 6000 + 2 x 40d
Cutting length of one distribution bar = 6000 + (2 x 40 x 12)
Cutting length of one distribution bar = 6000 + 960
Cutting length of one distribution bar = 6960 meter
Step 3: Calculate Total length of distribution rods.
Therefore Total length of crank bars = Length of one crank bar x No. of crank bars
Total length of crank bars = 6960 x 21 = 146160 mm = 146.160 meter.
Step 4: Calculate total weight of distribution rods.
W2 = (d2 / 162.25) x Length
W2 = (122 / 162.25) x 146.160
W2 = 129.72 kg development length
For Top Extra bars:
Length of top extra bar = L/4 = 3000/4 = 750 mm
No. of top extra bars = No. of Main bars = 41
Total length of Top extra bars = 750 x 41 = 30750 mm
Total length of Top extra bars = 30.750 meter
Therefore total weight of top extra bars = W3
W3 = (162 / 162.25) x 30.750
W3 = 48.52 Kg development length
Total Weight of Reinforcement:
Hence, calculate steel quantity
Total Weight of Steel Rod = Total Weight of crank bars + Total Weight of Distribution bars + Total weight of extra top bars
Total Weight of Steel Rod = W = W1 + W2 + W3
Total Weight of Steel Rod = W = 281.23 kg + 129.72 kg + 48.52 kg
Total Weight of Steel Rod = W = 459.47 kg
Rebar Calculator for Slab:
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I sincerely hope you find this article on “Bar Bending Schedule for One Way Slab“ to be useful. calculate steel quantity
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