Calculation of Cutting Length of Circular Stirrups

Before calculate any BBS please read Civil Structure drawing care fully.

Given value  in drawing.

1. Diameter = 500 mm
2. Clear Cover = 40 mm (Add half of ring dia  in clear cover for effecting clear cover)
3. Effecting clear cover = 44 mm
4. Ring Dia  =  8 mm
5. For Hooks  = 10d or 75 mm
6. Band  = 3d for 135°
7. For Hooks  = 10d or 75mm
8. Band  = 3d for 135° (In circular stirrups band of hooks is 135° )

Formula for calculate circular stirrups

Length of Circular ring  = Circumference of Ring + 2 numbers of hooks – 2 numbers of 135° bends

1. Circumference of ring   =  2丌r
2. Diameter of ring   d    =500
3. Radius or column    r  =d/2 =500/2
4. Radius of ring   = 250-44 =206

Length of Circular ring     = Circumference of ring + 2 no. of hooks – Bend Deduction 

Length of Circular ring 

=(2𝑥3.14𝑥206)+(2𝑥10𝑥8)-(2𝑥3𝑥8)  

= 1405.6 mm

= 1.40m