How to find length of Spiral Bar or Helix Bar

In this video you will learn How to find length of Spiral Bar. Spiral reinforcement is used in circular column, pier or pile. In this video circular column has taken an example to show the method how to find the length of spiral reinforcement. Three terms are needed to find the length of spiral bar, these are,
1. The no of turns.
2. The circumference of bar.
3. Pitch provided in spiral.
There is a formula which is explained in detail in the video, putting all the values in formula, one can get the length of spiral.
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[@mahmoudroushdy5486]

I calculated the spiral length using this formula and compared it to the actual length from a helix 3d cad shape they are exactly the same .. well done thank you

[@dergjz7974]

Thank you for the formula and the explanation. This is just what I was looking for!

[@civilengineering94]

Glad it was helpful!

[@BenRyherd]

Was needing this for a CAD model and couldn't think of how to get started. This equation does make sense, but had to prove it to myself before I'd feel comfortable using it parametrically. If you think of a helix as an inclined plane wrapped around a cylinder (thanks Big Bang Theory) and you were to unroll that inclined plane (triangle) out of the cylinder you'd get a triangle that's n*p tall and n*c wide. With Pythagorean theorem we know that the hypotenuse is equal to square root of the sum square of the two other sides. Since the hypotenuse of the triangle is the length of your spiral that's what you're trying to get, you would take (N*P)^2 + (N*C)^2=(Length of Spiral)^2. Square rooting everything you get SQRT((N*P)^2 + (N*C)^2)=Length of Spiral. Then some factoring gives you SQRT(N^2(P^2+C^2))=Length of Spiral, and then you can pull the N^2 term out of the square root (taking the square root as you do) getting you N*SQRT(P^2+C^2)=Length of Spiral (The equation from the video).

[@Hi-pf2sg]

This was very very helpful.Thank you so much

[@civilengineering94]

Glad it was helpful!

[@josalejolo]

Thanks! I’ve been searching for this

[@civilengineering94]

Hope you like it!

[@SeemaSharma-lu6ul]

Brilliant

[@esmaeilmotamedi8468]

thanks for this useful video dude.

[@civilengineering94]

Glad you liked it!

[@civillogy]

good work ,,, keep it up

[@civilengineering94]

Thanks a lot

[@arifafridi8641]

wow very thanks thanks

[@civilengineering94]

Most welcome

[@russelllloydsantos3329]

Thank you sir very helpful video

[@civilengineering94]

Most welcome

[@vinayakkavade2937]

How calculate cutting length spiral in rectangle column

[@anshkumarentertainment1151]

Good video bro
Where are you from bro

[@anissbenthami]

Thank you very much

[@civilengineering94]

You are welcome

[@HamidAli-kj3vy]

good bro thanks

[@civilengineering94]

You're welcome!

[@khalidnasir5445]

Much helpful site in construction industry issues

[@AnikSarker-ll5ef]

thank you sir

[@civilengineering94]

Most welcome

[@ztazeux]

do tut of how to find helex pls

[@happening2023]

Sir which IS code this formula is based on? Because i need to explain this with some foundation to my junior.

[@therookiercguy]

Good video

[@civilengineering94]

Thanks

[@TMmizan075]

Thanks

[@civilengineering94]

Welcome

[@vincentcacho9867]

Is D inside dia.? Or outside dia.?

[@abdurrahim3605]

good

[@civilengineering94]

Thanks

[@gaurav522chd]

SUPER ..... GOOD

[@civilengineering94]

Thanks GAURAV

[@anubhavparashar0254]

Aree we want proof of the for.ula

[@kingdomofknowledge5960]

D = 2r = r + r
C = 2 × pi × r .... isn't it, sir ?

[@mayamathi6319]

6:21

[@opakedragon]

isnt 9.4*9.4+2*2=88.36+4=92.36? how did he get 92.73?

[@hafeezrehman5010]

Thts my question too🤦🏻

[@richardpfleging2029]

The circumference at 2 significant digits is 9.42. If you use that in the formula you get 92.73. If you let the spreadsheet calculate PI then you get 92.83. It's just rounding for the video.

[@NadavJulius]

5√92.73 = 2.47 ..... or at least that's what I'm getting

[@NadavJulius]

..... I was actually looking for a response 😳