In this construction video tutorial, one can learn the process for working out the cutting length of stirrups in various forms like rectangular, square or circular.

Suppose the dimensions of a square shaped stirrup are as follow:-

Length = 300 mm

Breadth = 400 mm

Diameter of steel bars = 8 mm

Clear span of the concrete cover = 40 mm

The distance from exterior face to center position = 44 mm

Suppose the dimensions of a square shaped stirrup are as follow:-

Exterior diameter of the column = 600 mm

Diameter of steel bars = 8 mm

Clear span = 40 mm

Calculation of the cutting length of the rectangular column

Size of the column = Length x Breadth = 300 x 400 mm

Length of the column (A) = 300 – (2 x 44) = 212 mm (clear span of concrete cover for both sides)

Here, length is considered from the center of one bar to the another. So, diameter of the bar should be divided with 2 i.e. 8/2 = 4. It will be added with clear span of 40 mm i.e. 40 + 4 = 44 mm

Breadth of the column (B) = 400 – (2 x 44) = 312 mm

Hook length = 10D = 10 x 8 = 80 x 2 = 160 (as there are two hooks)

Cutting length of stirrup = (A x 2) + (B x 2) + Hook length (length & breadth are taken for two sides) = (212 x 2) + (312 x 2) + 160 = 1208 mm = 1.208 m (after converting to meter)

The same formula will be applicable for determining the cutting length of square stirrups.

Calculation of the cutting length of the rectangular column:-

Diameter of the column = 600 mm (it is the external dia from face to face)

Diameter of the stirrup center to center = 600 – (2 x 40) – (4 + 4) = 512 mm (span of concrete cover for both sides; half of the dia of the bar for both sides)

Parameter of stirrup = πd = 3.142 x 512 = 1608.704 mm (the value of pie = 3.142)

Hook length = 10D = 10 x 8 = 80 x 2 = 160 mm (the formula of hook length calculation = 10D)

Cutting length of stirrup = parameter of stirrup + hook length = 1608.704 + 160 = 1768.704 mm = 1.768 m So, the cutting length of stirrup for circular column = 1.768 m

Video Courtesy : Civil Study