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HOW TO CALCULATE STIRRUP CUTTING LENGTH

Prabhudutta Panda
Prabhudutta Panda

WHAT IS BAR BENDING SCHEDULE? BENDING DEDUCTION? HOW TO CALCULATE STIRRUP CUTTING LENGTH? WITH DETAIL EXAMPLE THIS VIDEO LINK https://youtu.be/OvM6i2cvBK0 FOR MORE DETAIL PLEASE VISIT MY YOUTUBE CHANNEL "THE CIVIL THUNDER" https://www.youtube.com/c/THECIVILTHUNDER

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HOW TO CALCULATE STIRRUP CUTTING LENGTH
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

  • 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