How to Calculate Length of Spiral Bar | Length of Spiral Bar
Spiral bars are also known as helical bars which have higher resistance strength against lateral forces. These spiral bars are designed to play reliable and permanent crack-sewing repairs to the masonry. These spiral bars have been put on the cracks and help to extend the strength of the masonry walls.
Spiral bars are also renowned as transverse reinforcement. These types of bars are generally utilized in the reinforcing circular column. In the case of beams, this type of spiral reinforcement is known are stirrups. In the case of a rectangular column, spiral bars are known as ties, yet, in a circular column, it is known as spiral reinforcement.
Spiral bars
Uses of spiral bars
Maintaining structural integrity
In the case of the deep foundations, the structural integrity of the caissons and piles has been improved by the spiral bars.
Repairing cracks
These types of spiral or helical bars are also used for anti-crack reinforcement around the windows and doors of the buildings.
Improving concrete columns
The load-bearing capacity of the construction units has been improved by the reinforcement of the spiral bars. This improved the load-bearing capacity of the spiral bars is resistance to the concrete column’s buckling.
Construction of bridges
These spiral bars are used for the spiral bend rebars. These are used in the form of required shapes for the construction of large-scale civil projects or the construction of bridges.
Estimating the length of spiral bars
The cutting length of the spiral bars can be calculated by collecting several given data. The given data includes the height of the spiral or helical bars, the diameter of the bottom side of the spiral bars, the diameter of the top side of the spiral bars, and also required information about the pitch of the spiral bar. After collecting the required information about the spiral bars, a formula for calculating the length of the spiral bars is used and put all the values into that formula to estimate appropriate results.
The subsequent formula for calculating the spiral bar’s length is = L = n√(C^2+P^2 )
Here, L stands for the length of the spiral bar
In stands for the number of the tern of spiral bar
C stands for the circumference of the spiral bar which is equal to the πD
P stands for the pitch of the spiral bar
We assumed that,
The height of the spiral bar (H) is = 17 foot
Both the diameter of the top side and the bottom side of the spiral bar (D) are respectively = 4.5 foot and 4.5 foot
The pitch of the spiral bar (P) is = 2.5 foot
So, it can be estimated that the value of the circumference of the spiral bar (C) or πD is = 3.14 x 4.5 foot = 14.13 foot
The number of the tern of the spiral bar can be estimated by dividing the height of the spiral bar by the pitch of the spiral bar.
So, in this case, the number of the tern (n) will be = 17 / 2.5 foot = 6.8 foot
If all the values are put into the given formula for the spiral bar’s length measurement, the value
for the length will be = 6.8√(14.13)²+(2.5)² feet
= 6.8√(199.66+6.25) feet
= 6.8√205.91 feet
= 6.8*14.35 feet
= 97.58 feet
So, the length of the spiral bars in accordance with the given data will be 97.58 feet.
Additional factors need to be considered to calculate the accurate length of the spiral bar
The diameter of the spiral bars
It needs to be ensured that the diameter of the spiral bars is suitable for the required appropriate reinforcement.
The codes of the local buildings
It is also important to adhere to the codes and standards of the local buildings on the construction sites. This is required for considering the specific requirements of the buildings as well as considering the requirements of the designs.
The length of the hook
The hook length at both ends of the spiral bars needed to be accounted for properly before calculating the length of the spiral bars. This is necessary to get accurate results.
Considering the waste factors
The waste factors also need to be considered before starting the measurement of the spiral bar’s length. These waste factors should have to account for the cutting losses of the spiral bars or bending losses of the spiral bars.
To learn more, watch the following video tutorial.
Video Source: Civil Engineering
The accurate calculation of the spiral bar’s length can be done more accurately for the specific project by considering these factors.
