WHAT IS BAR BENDING SCHEDULE ( BBS) & 7IMPORTANT POINTS

Reinforcement Bar

*What is Bar Bending Schedule(BBS) :-

        Bar bending is the process of cutting and bending of reinforcement bar into requried shape.

Making List Which Describe :- 

✅ Location and Making of bar 

✅Type of Bar 

✅Size of Bar 

✅ Cutting Length of Bar 

✅ Bending details of Bar 

✅ Total Quantity

 Of each bar in reinforcement drawing of a structure.

 This process of listing is called SCHEDULING.

 

2) ADVANTAGE OF BAR BENDING SCHEDULE (BBS)

📝 Cutting length and bending of reinforcement can be done.

📝BBS avoids wastage of steel reinforcement and thus save project cos.

📝 It provide better Estimation of reinforcement steel Requirement for each and every structure member.

📝BBS Is very useful during Auditing of Reinforcement and provide check for Theft and pilferage.

📝It enables easy and fast preparation of Bills of construction work for clients and contract.

3) WHY STEEL IS USED AS REINFORCEMENT BAR :-

*As Concrete is weak in tension so steel is used as a tensile support for RCC.

*Coefficient of Thermal expansion characteristics similar to concrete. (12X10^6/C° )

*Good Strength for economic design of RCC structure.

*Good gripping or good bonding with concrete.

*Good resistance against corrosion for higher durability.

*Good bendability for providing requried shape.

Concrete Reinforcement Bar

4) TYPE OF REINFORCEMENT BAR :- 

    *FE250 (mild steel Bar/plain bars) 

    *FE415( Hot rolled deformed TMT bars)

    *FE415D

    *FE500

    *FE500D

    *FE550

    *FE550D

    *FE600D

 Describe:- ex

 Fe= Iron 

 415 =Yield stress(MPA) 

 D= Ductility /Elongation

5) SIZE AND UNIT WEIGHT OF BAR:- 

  *8MM = (8x8)/162 = 0.395 kg/m.

  *10MM = (10x10)/162 = 0.617 kg/m.

  

  *12MM = (12x12)/162 = 0.888 kg/m.

  

  *16MM = (16x16)/162 = 1.580 kg/m.

  

  *20MM = (20x20)/162 = 2.469 kg/m.

  *25MM = (25x25)/162 = 3.858 kg/m.

 *32MM = (32 x 32) 162 = 6.320 kg/m.

*36 MM = (36x36)/162 = 8 kg/m.

6) BEND DEDUCTION AND VALUES:- 

    *45° bend deduction value =1D

    

    * 90° bend deduction value =2D

    *135° bend deduction value =3D

    *180° bend deduction value =4D

7) CLEAR COVER AND EFFECTIVE COVER :- 

  *Clear Cover :- 

   Footing:- 50 MM

   Column:- 40 MM 

   Slab:- 20 MM

   Beam :- 25MM 

   Staircase:- 15 MM

   Chajja :- 15 MM 

   Pile :- 60 MM

   Pile Cap :- 60MM 

   Retaining Wall :- 50 MM

8) STANDARD IS CODES USED FOR BAR BENDING SCHEDULE (BBS):- 

 *456:2000 

  (Reinforcement lap details)

   

*2502:19631 

   ( How to find the cutting length )

*5525:1969 

    ( Reinforcement naming , position ,Representation, steel related detail )

*13920:1993

      ( Schesmic zone load , Development length, Lap zone ,column beam lap zone )