How to calculate cutting length of rectangular stirrups

How to calculate cutting length of rectangular stirrup,cutting length of rectangular stirrups,in this topic we know about how to calculate cutting length of rectangular stirrup. 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 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 rectangular stirrup.

You should visits:-

● how to calculate cutting length of rectangular stirrup

● how to calculate cutting length of circular stirrup

●How to calculate cutting length of triangular stirrup

Calculate cutting length of rectangular stirrups

It is total length of rectangular closed ring having hook at one corner ring. suppose we have given following

Size of column = 225mm×300mm

Clear cover = 25 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 ring + hook length – bend elongation

1) first we calculate perimeter of ring

Perimeter = 2( A+B)

Length of A = 225 _2 cover _ 2 half dia of ring

A = 225_2×25_2×4

A= 225_50_8 = 167 mm

Length of B = 300_2×25_2×4

Length of B = 242 mm

Perimeter = 2(167+242)=2×409

Perimeter = 818 mm

Hook length calculation for rectangular stirrups

In ring it has two hook length , minimum size of hook length is equal to 75 mm or 10d where d is diameter of ring

hook length = 2×10d

Hook length = 2×10×8=160mm

bend elongation calculation for rectangular stirrups

In close ring renforcement we have 3 bend at 90 degree and two bend at 135 degrees.

● bend angle 45° = 1d
● bend angle 90° = 2d
● bend angle 135°= 3d

Bend = 3 bend 90°+2bend at 135°

Bend = (3×2d)+(2×3d)

Bend = (3×2×8)+2×3×8

Bend = 48+48=96mm

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5) ultimate load carrying capacity of column

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

Cutting L = 818+160_96 mm

Cutting length =882 mm = 0.882 meter

0.882 meter is cutting length of rectangular stirrup in 225mm×300mm size rectangular column