How to calculate cutting length of diamond stirrups,Cutting length of diamond stirrups**,**in this topic we know about how to calculate cutting length of diamond stirrups. Another word stirrups is also known as ring or shear reinforcement. It is closed loop of reinforcements used to hold the main reinforcement in RCC structure like column and beam.

The rhombus shape diamond Ring used in column provide lateral support to the the main bar against buckling it is used at proper interval to beam and column to prevent them from **buckling**.

Also they protect RCC structure from collapsing during seismic activity like earthquake. It is used to resist lateral shear stress and diagonal tension stress in RCC structure and provide stability to the reinforcement of Steel bar.let us discuss about how to calculate cutting length of diamond stirrups.

**How to calculate cutting length of diamond stirrups**

It is total length of **rhombus shape** closed ring having hook at one end reinforcement used in column. suppose we have given following

**Size of column = 400×300 mm**

Length =400 mm

Width =300 mm

Clear cover = 25 mm

Dia of stirrups=8mm

Dia of steel in column=12 mm

**When we use 10 mm and 12 mm die of Steel bar in column we have clear cover is equal to 25 mm and when we use more than 12 mm die of Steel bar in column we have clear cover is equal to 40 mm.**

Cutting length = perimeter of stirrup + hook length – bend elongation

**first we calculate perimeter of diamond stirrups**

Perimeter= 4C

We have given length of column

Length=400 mm.

First we calculate length of a side that is base of diamond stirrups

Length of a = 400_2cover_2×4(half dia of stirrups at both sides)

Length of a = 400_2×25_2×4 mm

Length of a = 342 mm

For calculating the value of b sides we have to calculate height of diamond stirrup

We have given width= 300 mm

b sides =300_2cover_2×4(half dia of stirrups at both sides)

b side = 300_2×25_2×4 mm

b side =242 mm

Now we have a= 342 mm and b= 242 mm

Now calculate value of C by Pythagorus theorem in which C is hypotonuse a/2 is base and b/2 is perpendicular

a/2 = 342/2 =171 mm

b /2 =242/2= 121 mm

C = √ (a/2)^2+(b/2)^2

C=√ (271)^2+(121)^2

length of C =√88082

Length of C = 296.786 mm

Now perimeter = 4C

Perimeter = 4×296.786

**Perimeter = 1187 mm**

**calculation of hook length of diamond stirrups**

In rhombus shape diamond ring it has two hook length , minimum size of hook length is equal to 75 mm or 10d where d is dia of stirrup

Hook length = 10d ,but in diamond stirrups it has two hook

hook length = 2×10d

**Hook length = 2×10×8=160mm**

**bend elongation calculation of diamond stirrups**

In closed diamond stirrups reinforcement we have 3 bend at 90° and 2 bend at 135 degrees.

**● bend angle 45° = 1d**

**● bend angle 90° = 2d**

**● bend angle 135°= 3d**

**Bend elongation =3 bend 90°+ 2 bend at 135°**

Bend = 3×2d +2×3d =12d

Bend elongation = 12×8 = 96 mm

**now cutting length of diamond stirrup**

**Cutting length = perimeter of ring + hook length – bend elongation**

Cutting L = 1187+160_96 mm

Cutting length =1347 mm _96mm

Cutting length=1251 mm

Hence cutting length of diamond stirrups

Is about 1.251 meter.

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**Note**:- Diamond shape stirrup is Rhombus shape stirrup also known as ties bar , Diamond stirrup are very difficult to accurately fabricated and so it is avoided it is also difficult to place and align them properly.