Add step 3 and 4 and subtract step 5 from it. Hook length is 5d lap length can been given at the end L7 and at continuous L4. ASTM STANDARD REINFORCING BARS BAR SIZE DESIGNATION NOMINAL DIMENSIONS.
As from the diagram pythagorean theorem H a 2b2 2.
2d 90 Bends in stirrup. Having identical hook lengths is important so that if you have to replace one then the replacement with be an identical length and you wont have to plumb th. General Formula to calculate cutting length of any steel bars. Lets calculate the cutting length of the above triangular stirrup Cutting Length of Stirrup Perimeter of Stirrup 2 x Hook Length 4 x 135 bends.