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

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