Calculate The Bar Bending Schedule For One Way And Two Way Slab
Bar Bending Schedule For One Way Slab | Bar Bending Schedule For Two Way Slab
Calculate The Bar Bending Schedule For One Way And Two Way Slab
Today I have the topic of Calculate The Bar Bending Schedule For One Way And Two Way Slab.| what is the difference between one-way ad two-way slab |Bar Bending Schedule For One Way Slab |Bar Bending Schedule For Two Way Slab|Bar Detail of one Way Slab | Bar Detail of Two Way slab?
What Is The One Way and Two Way Slab?
Before calculating the bar bending schedule for the slab must be known about the one-way and two-way slabs. one way slab has the main bar or crank bar on the shorter side and a distribution bar on the long side. But the two-way slab has both sides the crank bar which is the difference between one way and a two-way slab.
Bar Detail on a one-way slab
Main bar or crank bar on the shorter side
The distribution bar is on the long side. And this bar is the straight bar
The extra bar has the bottom of the crank bar. And this bar is the straight bar.
Bar Detail on a two-way slab
The main bar and distribution are the same size same crank bar on both sides.
The extra bar has the bottom of the crank bar on both sides.
Calculate the Bar Bending Schedule for One Way and Two Way Slab
One way slab
Given data:
Length of slab (along beam) =5000mm=5m
Width of slab (without beam 90degree beam side) =2000mm=2m
Length of extra bar=L/4=2000/4=500
Diameter of main bar/crank bar=16mm
Diameter of top extra bar=16mm
Diameter of distribution bar=12mm
Spacing of main and distribution bar=150mm
Concrete cover bottom and top=20mm
Concrete cover of side=25mm
Solution
Main bars dia=16mm
Cutting Length of main bar/crank bar
Cutting Length of main bar/crank bar=clear span+2xLd+crank length -2bends 45degre
Cutting Length of main bar/crank bar=2000+(2x40d)+0.42D-2x45d
Here
Ld=development length
Ld=40d=40×16=640mm
Crank length=0.42D ({D= deapth of slab-2(sides c.c) –dia of bar}
D= 150-2(25)-16=84mm
45 degree bend=1d=16
Now
Cutting Length of main bar/crank bar=2000+(2x40x16)+(0.42×84)-(2×16)
Cutting Length of main bar/crank bar=2000+1280+35.28-32=3283.28mm=3.283m
Number of main bar/crank bar
Number of main bar/crank bar =length of slab/spacing+1
Number of main bar/crank bar =5000/150+1=34.33=35No’s
Total length of main bar/crank ba=length of one bar x number of bar
Total length of main bar/crank bar=3.283×35=114.915m
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Weight of main bar/crank bar
Weight of main bar/crank bar=d²/162.25 x total length
Weight of main bar/crank bar=(16)²/162.25 x 114.915=181.314kg=182kg
Distribution bars dia=12mm
Cutting Length of distribution bar
Cutting Length of distribution bar=length of the slab +2xLd
Ld = 40d=40×12=480mm
Cutting Length of distribution bar=5000+2x40x12=5960mm=5.960m
Number of distribution bar
Number of distribution bar=total width of slab/spacing +1
Number of distribution bar=2000/150+1=14.33=15No’s
Total Length of distribution bar=length of one bar x number of bar
Total Length of distribution bar=5.960×15=89.400m
Weight of distribution bar
Weight of distribution bar=d²/162.25 x total length
Weight of distribution bar=(12)²/162.25 x 89.400=79.344=80kg
Top Extra bars
Cutting length of extra bar
Cutting length of extra bar=L/4=2000/4=500
We know
Number of extra bar= Number of the main bar
35=35
The total length of extra bar=length of one extra bar x Number of extra bar
Total length of extra bar=500×35=17500mm=17.500m
Weight of Extra bar
Weight of Extra bar= d²/162.25 x total length
Weight of Extra bar= (16)²/162.25 x 17.500=27.612=28kg
Total weight of 16mm=182+28=210kg
Total weight of 12mm=80kg
Calculate The Bar bending Schedule for Two Way slab
Bar bending schedule for two way slab have both sides of the crank bar and is the same procedure that is followed to find the one way slab for the crank bar.
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