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 WHAT IS BBS?
 Bar Bending Schedule, commonly referred to as “BBS”.
 Bar bending schedule provides the reinforcement calculation for a Reinforcement
Drawing of a Structure.
 It provides details of reinforcement cutting length, type of bends and bend length.
 WHAT IS CUTTING LENGTH?
 WHEN IT COMES TO THE LENGTH OF A STIRRUP BAR
THERE ARE TWO TYPES OF LENGTH
1) ACTUAL LENGTH
2) CUTTING LENGTH
450
MM
550
MM
CUTTING LENGTH IS ALWAYS SMALLER THAN ACTUAL LENGTH.
 WHEN YOU MAKE STIRRUPS WE CUT BARS BASED ON CUTTING LENGTH,OTHERWISE YOU CAN
NOT GET REQUIRED SIZE ,BCOZ OF BENDING BAR LENGTH INCREASES(STRETCHING IN BENDING
AREA)
 IF WE CUT BY ACTUAL SIZE,IT IS MORE LENGTH ACTUALLY WE NEED.
 WHAT IS STIRRUP?
 A STIRRUP IS A CLOSED LOOP OF REINFORCEMENT BAR THAT IS USED TO HOLD THE MAIN
REINFORCEMENT BARS TOGETHER IN AN RCC STRUCTURE.
 IN A COLUMN, THE STIRRUPS(TIES) PROVIDE THE LATERAL SUPPORT TO THE MAIN BARS
AGAINST BUCKLING.
 WHEN USED IN BEAMS, A STIRRUP IS TERMED AS SHEAR OR TRANSVERSE REINFORCEMENT
SINCE IT WITHSTANDS THE SHEAR FORCE.
(PUSHING ONE PART OF A BODY IN ONE SPECIFIC DIRECTION, AND ANOTHER PART OF THE BODY
IN THE OPPOSITE DIRECTION)
 BEND DEDUCTION
BEND ANGLE(IN DEGREE) DEDUCTION
45 1D
90 2D
135 3D
180 4D
 EXAMPLE
LONG SIDE OF BEAM=550MM
SHORT SIDE OF BEAM=450MM
CLEAR COVER=40MM
SO LONG SIDE OF STIRRUP=LONG SIDE OF BEAM-(2*CLEAR COVER)=550-(2*40)=470MM
SO SHORT SIDE OF STIRRUP=SHORT SIDE OF BEAM-(2*CLEAR COVER)=450-(2*40)=370MM
HOOK LENGTH=9D OR NOT LESS THAN 75MM=9*10=90mm
Actual length of stirrup is
=(2*long side)+(2*short side)+(2*hook length)
=(2*470)+(2*370)+(2*90)
=1870mm
CUTTING LENGTH OF STIRRUP
=[ACTUAL LENGTH OF STIRUP]-[BEND DEDUCTION]
=[(2*long side of stirrup)+(2*short side of stirrup)+(2*hook length)]-[(3*900 bend)-(2*1350 bend)]
=[1870 - 3*2D - 2*3D]=[1870 - 3*2*10 - 2*3*10]
=[1870-120]
=1750MM

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HOW TO CALCULATE STIRRUP CUTTING LENGTH

  • 1.
  • 2.  WHAT IS BBS?  Bar Bending Schedule, commonly referred to as “BBS”.  Bar bending schedule provides the reinforcement calculation for a Reinforcement Drawing of a Structure.  It provides details of reinforcement cutting length, type of bends and bend length.  WHAT IS CUTTING LENGTH?  WHEN IT COMES TO THE LENGTH OF A STIRRUP BAR THERE ARE TWO TYPES OF LENGTH 1) ACTUAL LENGTH 2) CUTTING LENGTH 450 MM 550 MM
  • 3. CUTTING LENGTH IS ALWAYS SMALLER THAN ACTUAL LENGTH.  WHEN YOU MAKE STIRRUPS WE CUT BARS BASED ON CUTTING LENGTH,OTHERWISE YOU CAN NOT GET REQUIRED SIZE ,BCOZ OF BENDING BAR LENGTH INCREASES(STRETCHING IN BENDING AREA)  IF WE CUT BY ACTUAL SIZE,IT IS MORE LENGTH ACTUALLY WE NEED.
  • 4.  WHAT IS STIRRUP?  A STIRRUP IS A CLOSED LOOP OF REINFORCEMENT BAR THAT IS USED TO HOLD THE MAIN REINFORCEMENT BARS TOGETHER IN AN RCC STRUCTURE.  IN A COLUMN, THE STIRRUPS(TIES) PROVIDE THE LATERAL SUPPORT TO THE MAIN BARS AGAINST BUCKLING.  WHEN USED IN BEAMS, A STIRRUP IS TERMED AS SHEAR OR TRANSVERSE REINFORCEMENT SINCE IT WITHSTANDS THE SHEAR FORCE. (PUSHING ONE PART OF A BODY IN ONE SPECIFIC DIRECTION, AND ANOTHER PART OF THE BODY IN THE OPPOSITE DIRECTION)
  • 5.  BEND DEDUCTION BEND ANGLE(IN DEGREE) DEDUCTION 45 1D 90 2D 135 3D 180 4D
  • 6.  EXAMPLE LONG SIDE OF BEAM=550MM SHORT SIDE OF BEAM=450MM CLEAR COVER=40MM SO LONG SIDE OF STIRRUP=LONG SIDE OF BEAM-(2*CLEAR COVER)=550-(2*40)=470MM SO SHORT SIDE OF STIRRUP=SHORT SIDE OF BEAM-(2*CLEAR COVER)=450-(2*40)=370MM HOOK LENGTH=9D OR NOT LESS THAN 75MM=9*10=90mm
  • 7. Actual length of stirrup is =(2*long side)+(2*short side)+(2*hook length) =(2*470)+(2*370)+(2*90) =1870mm CUTTING LENGTH OF STIRRUP =[ACTUAL LENGTH OF STIRUP]-[BEND DEDUCTION] =[(2*long side of stirrup)+(2*short side of stirrup)+(2*hook length)]-[(3*900 bend)-(2*1350 bend)] =[1870 - 3*2D - 2*3D]=[1870 - 3*2*10 - 2*3*10] =[1870-120] =1750MM