Example: Consider Rectangular Column 450mm x 300mm having cover to reinforcement 40mm.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip5Vpu_sTiv_u2rH8uzHphBCkye2rxm2gpRdrMucHWipJrzW117FeM5HCJZhzcDkVT7MYefMrrqf6TenZ3ORGDGkUXFXYWfm3QugV29VXvpPwiPfhg-g6bBumDE3s8H1Gz5hVro99cywuz/s200/Presentation1.jpg)
Size of the stirrup on 450mm side= 450-40-40 = 370mm
Size of the stirrup on 300mm side= 300-40-40 =220mm
Total cutting length of ring for 8 dia bar = Periphery + hook length.
=2*370+2*220+2*8*10=1340mm
hook length= 10D
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip5Vpu_sTiv_u2rH8uzHphBCkye2rxm2gpRdrMucHWipJrzW117FeM5HCJZhzcDkVT7MYefMrrqf6TenZ3ORGDGkUXFXYWfm3QugV29VXvpPwiPfhg-g6bBumDE3s8H1Gz5hVro99cywuz/s200/Presentation1.jpg)
Size of the stirrup on 450mm side= 450-40-40 = 370mm
Size of the stirrup on 300mm side= 300-40-40 =220mm
Total cutting length of ring for 8 dia bar = Periphery + hook length.
=2*370+2*220+2*8*10=1340mm
hook length= 10D