How to calculate cutting length of triangular stirrups,Cutting length of triangular stirrups,in this topic we know about how to calculate cutting length of triangular 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 triangular 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 triangular stirrups.
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
Cutting length of triangular stirrups
It is total length of triangular closed ring having hook at one reinforcement used in column. suppose we have given following
Size of column = 600×500 mm
Length =600 mm
Width =500mm
Clear cover = 40 mm
Dia of stirrups=8mm
Dia of steel in column=16mm
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 stirrups
Perimeter= (a+2b)
We have given length of column
Length=600 mm.
First we calculate length of a that is base of triangular stirrups
Length of a =600_2cover_2×4(half dia of stirrups at both sides)
a = 600_2×40_2×4 mm
Length of a = 512 mm
For calculating the value of b sides first we have to calculate height of triangular stirrup
We have given width=500mm
H =500_2cover_2×4(half dia of stirrups at both sides)
H = 500_2×40_2×4
Height =412 mm
Now we have a=512 mm and H=412mm
Now calculate value of b by Pythagorus theorem in which b is hypotonuse a/2 is base and H is perpendicular
a/2 = 512/2 =256 mm
b = √ H^2+(a/2)^2
b=√ (412)^2+(256)^2
length of b =√235280
Length of b =485 mm
Now perimeter = (a+2b)
Perimeter = 512+2×485 mm
Perimeter = 1482 mm
calculation of hook length of traingular stirrups
In triangular ring it has two hook length , minimum size of hook length is equal to 75 mm or 10d where d is dia of bar
Hook length = 10d ,but in triangular ring it has two hook
hook length = 2×10d
Hook length = 2×10×8=160mm
bend elongation calculation in traingular stirrup
In closed triangular ring reinforcement we have 4 bend at 135 degrees.
● bend angle 45° = 1d
● bend angle 90° = 2d
● bend angle 135°= 3d
Bend elongation = 4bend at 135°
Bend = (4×3d)
Bend elongation = 4×3×8 = 96 mm
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● now cutting length of triangular stirrup
Cutting length = perimeter of ring + hook length – bend elongation
Cutting L = 1482+160_96 mm
Cutting length =1642 mm _96mm
Cutting length=1546 mm
Hence cutting length of triangular stirrups
Is about 1.546 meter.