Bar Bending Schedule of Two way Slab – 1 Best Rule to Calculate

Bar Bending Schedule of Two way Slab

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

Hello Friends 

 

Today We will discuss about the Bar Bending Schedule of Two way Slab

 

Before moving forward first you should know that What is bar Bending Schedule and what is the importance of bar bending schedule in building construction or civil engineering

 

What Is Bar Bending Schedule

 

Bar Bending Schedule is the process of cutting & bending of Reinforcement bars into required shape, which gives the complete information about reinforcement steel bars like Location and marking of bars, types of bars, size of bar, cutting length of bar,bending details of bar, number of bar, Shapes of Bars and total quantity of steel,

 

Importance of Bar Bending Schedule

 

As you know that all the site workers are non technical and they has lack of knowledge about steel . So, It is the responsibility of a site supervisor to give them details of cutting , bending of steel. So , A bar bending schedule is the data which help the supervisor for this process.

 

Advantages of Bar Bending Schedule

 

1). B.B.S avoids wastage of steel reinforcement and thus save project cost.

 

2). it provides better estimation of reinforcement steel required for each and every structure members.

 

3). It enables easy or fast preparation of bill of construction work for clients and contractors.

 

So, Lets Move on the topic,

 

Bar Bending Schedule of Two way Slab

 

Given,

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

Diameter of all bars = 16 mm.

 

Spacing                      = 100 mm.

 

Top and Bottom Clear Cover = 25 mm.

 

Slab Thickness         = 150 mm.

 

Development length (Consider) = 40 d

 

Calculation

 

No. Of Main bars formula  =  Length Of Slab / Spacing +1

                                                        

Step 1

 

Calculation of numbers of bars 

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

1). For Length (L 1) side:-

 

     No. Of Main bars  =     L 1 / Spacing + 1  

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

                                         

    No. Of Main bars  =    4000 / 100 + 1  

 

                                     = 41 Nos.

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

No. Of Crank bars  = 21 Nos.

 

No. Of Straight Bar = 20 Nos.       

 

2). For Length (L 2) side 

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

     No. Of Main bars   =     L 2 / Spacing + 1                                        

 

     No. Of bars            =    5000 / 100 + 1

                     

                                      = 51 Nos.

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

No. Of Crank bars  = 26 Nos.

 

No. Of Straight Bar = 25 Nos.                     

 

Step 2

 

Cutting length of Bars :-

 

(i). Cutting Length Of L 1 side (Crank) Bar  

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

Length of Slab (L 1) + ( 2 x development Length) + ( 2 x inclined Length) – ( 45* Bend x 4 )   

     – ( 90* Bend x 2)

 

    = 5000+(2 x L d) + ( 2 x inclined length ) – ( 1 d x 4 ) – ( 2 d x 2 ).

 

      Always remember the,

 

 Inclined Length = 0.42 D

 

        For 45*        = 1 d

 

        For 90*        = 2 d

 

Cutting Length Of Main Bar (Crank) = 5000+(2 x 40 d) + (2 x 0.42 d) – (1 d x 4) – (2 d x 2 ).

 

= 5000 + ( 2 x 40 x 16 ) + ( 2 x 0.42 d ) – ( 1 x 16 x 4 )  –  ( 2 x 16 x 2 ).

      

= 5000 + 1280 + ( 2 x 0.42 d) – 64 – 64

 

Now, what is D

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

   D = Slab Thickness – 2 Sides Clear Cover – Diameter of  Bars.

   

       = 150 – 50 – 16

 

       = 84 mm.

 

 D = 84 mm.

 

Cutting Length = 5000 + 1280 + ( 2 x 0.42 x 84) – 128

                        

                         =  5000 + 1280 + 70.56 – 128

                        

                         = 6350.56 – 128 mm.

                        

                         = 6222.56 mm or 6.23 meter.

 

Cutting Length Of ( Crank ) Bar = 6.23 meter.

 

For 21 no. of bars = 21 x 6.23     = 130.83 meter.

 

Weight of steel        =  D x D/162 x L

                               

                                 = 16 x 16 / 162 x 130.83

                                

                                 =   1.58 x 130.83

                             

                                 =     206.71 Kg.

 

1(ii). Cutting Length Of (straight) Bar side (L 1)

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

    Length of slab (L 1) + ( 2 x development length )

 

(ii). Cutting Length Of (straight) Bar

 

        Length of slab (L 1) + ( 2 x development length )

 

             = 5000 + ( 2 x 40 d )

 

             = 5000 + ( 2 x 40 x 16 )

 

             = 5000 + 1280

 

             = 6280 mm or 6.28 meter.

 

For 20 No. Of Bars = 20 x 6.28    = 125.6 meter

 

Weight of steel      = 1.58 x 125.6 = 198.448 Kg

 

2(i). Cutting Length Of crank bar (L 2) side

 

         Cutting Length Of (L 2) side Bar

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

Length of slab (L 2) + ( 2 x development length ) x ( 2 x inclined length) – ( 45* bend x 4 ) –

( 90* Bend x 2 )

 

             = 4000 + ( 2 x 40 d ) + ( 2 x 0.42 D ) – ( 1 d x 4 ) – ( 2 d x 2 ).

 

            = 4000 + ( 2 x 40 x 16 ) + ( 2 x 0.42 d ) – (1 x 16 x 4 ) – ( 2 x 16 x 2 ) 

 

            = 4000 + 1280 + 70.56 – 64 – 64

 

            = 5350.56 – 128  = 5222.56 mm or 5.22 meter.

 

For 26 No. Of Bars = 26 x 5.22    = 135.72 meter.

 

Weight of steel      = 1.58 x 135.72 = 214.43 Kg

 

2(ii). Cutting Length Of (straight) Bar (L 2) side

 

    Length of slab (L 2) + ( 2 x development length )

 

             = 4000 + ( 2 x 40 d )

 

             = 4000 + (2 x 40 x 16)

 

             = 4000 + 1280

 

            = 5280 mm or 5.28 meter

 

For 25 No. Of Bars = 25 x 5.28    = 132 meter

 

Weight of steel      = 1.58 x  132    = 208.56 Kg

 

Step 3

 

3).  Extra Top Bar 

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

                                          

  No. of extra top bars =    ( L / 4 ) / spacing + 1

 

3).  Extra Top Bar  

 

 Formula     =   ( L 1 / 4 ) / Spacing + 1 x (2)

                                             

(i) For length ( L 1 ) side =   ( L 1 / 4 ) / Spacing+ 1 x (2)

                                            

                                                   =    (5000/4)/100 + 1 x (2)

                        

                               1250 / 100 + 1 x (2)  = 27 Nos.

                        

Length Of Extra Top Bar = Length of Same As Cutting Length of Straight Bar.

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

                                                            =  6.28 meter.

 

For 27 No. Of Bars = 27 x 6.28       = 169.56 meter.

 

Weight Of Steel      = 1.58 x 169.56 =  267.90 Kg.

 

3).  Extra Top Bar 

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

 

Formula =   ( L 2 / 4 ) / Spacing + 1 x (2)

                                             

(ii) For length ( L2 ) side   =   ( L / 4 ) / Spacing + 1 x (2)

                                           

                                             =    (4000/4) / 100 + 1 x (2)

                          

                                            = 1000 / 100 + 1 x (2) = 22 Nos.

                    

Length Of Extra Top Bar = Length of Same As Cutting Length of Straight Bar.

 

Bar Bending Schedule of Two way Slab
Bar Bending Schedule of Two way Slab

                              

                                                             =  5.28 meter

 

For 22 No. Of Bars = 22 x 5.28      = 116.16 meter

 

Weight Of Steel      = 1.58 x 116.16 = 183.53 Kg.

 

Total Weight Of Steel = Weight of L 1 side crank bar + Weight of crank bar L 2 side + weight of straight bar L 1 side + weight of straight bar L 2 side + weight of extra bar L 1 side + weight of extra bar L 2 side

 

Total Weight Of Steel  =  206.71 + 214.43 + 198.448 + 208.56 + 267.90 + 183.53

 

Total Weight of Steel =  1279.578 kg.

 

So, This the the best and easy method to calculate Bar Bending Schedule of Two way Slab. I hope now you will be understand the concept.

 

Thanks for your great attention,

 

Good Bye & Take care

 

Happy Learning 😆 

 

Related Video:-

 

Also Read :-

 

BRICKS IN 1 CUBIC FEET

WHAT IS GUNIA IN CONSTRUCTION // HOW TO MEASURE GUNIA

BASIC FUNCTIONAL REQUIREMENTS OF BUILDING

2 EASY TRICKS HOW TO FIND DEPTH & WIDTH OF BEAM

 

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