How to figure out the length of the cut on a circular stirrup
Determine the circular stirrup’s cutting length using the drawing below.
Give Data
D = 450mm for the circular column’s diameter
40mm for clear covers.
The stirrup’s diameter is 8 mm.
The cutting length of the circular stirrup
= [2r + (2no) hook length – (2no) hook bend]
= [2r + [2nos. 10d] – [2nos. 2d
ere,
The stirrup diameter is given by d.
R is the diameter of the circular stirrup’s centerline (as depicted in the drawing).
First, using the provided data, we will calculate the r value.
r is equal to [(1/2 column diameter) – clear cover – (1/2 stirrup bar diameter)]
The formula for r is [(1/2 450mm) – 40mm – (1/2 8mm)]
225mm – 40mm – 4mm = r
r = 181mm.
The cutting length of the circular stirrup
equals [(2 181mm) + (2nos 10d) – (2nos. 2d]
= [(2 3.142 181 mm) + (2 nos. 10 mm) – (2 nos. 2 mm)]
= [1137.4 mm plus 160 mm minus 32 mm]
= 1265.404mm
= 1.265m.
Different Shapes of Stirrups
- Rectangular Stirrups
- Square Stirrups
- Circular Stirrups – Also read: Calculator for circular stirrups
- Triangular Stirrups
- Spiral Stirrups
- Diamond Stirrups
Types Of Stirrups Used In Beam And Columns
- Single Legged Stirrups(Open stirrup)
- Two-legged or Double Legged Stirrups (Closed Stirrup)
- Four-legged Stirrups (Closed Stirrup)
- 6-legged Stirrups (Closed Stirrup)
Steps involved in finding the cutting length of stirrups
- Look at the size of the column or beam from drawings.
- Adopt Dia of the bar (generally 8mm Dia is used for stirrups.
- Deduct the concrete cover or clear cover.
- Find the total outer length of the stirrup after deducting concrete cover.
- Add the length of the hook to the length of the stirrup.
- Deduct the length of bends.
- Use the below formula to find the total cutting length of stirrups.
Cutting Length of Stirrups = Perimeter of Shape + Total hook length – Total Bend Length
PERIMETER OF SHAPE
(Length + Breadth)2 = the rectangle’s perimeter
A square perimeter equals four times the length of its sides.
Circle’s circumference, also known as its perimeter, is equal to its diameter times its radius, or r.
TOTAL HOOK LENGTH
1 the Hook length = 9d or 75mm
TOTAL BEND LENGTH
45° Bend length equals 1d
90° Bend length = 2d
135° degrees Bend length is equal to 3d,
where d is the bar’s diameter
