Simple Circular Curve

on . Posted in Surveying Engineering

A simple circular curve is a curve that is part of a circle.  A circle is defined as the set of all points in a plane that are a given distance (radius) from a given point (center).  A circular curve, then, is a segment of this circle.  Simple circular curve is a curve that does not cross itself.

 

Simple Circular Curve formulas

\(\large{ c = 2 \; r \; sin \; \frac{ \theta }{ 2 }  }\)

\(\large{ E = r \; sec \; \frac{ \theta }{ 2 } \;-\; r  }\)

\(\large{ l = \frac{ \pi \; r \; \theta }{ 180 }  }\)

\(\large{ M = r \;-\; r \; cos \; \frac{ \theta }{ 2 }   }\)

\(\large{ T = r \; tan \; \frac{ \theta }{ 2 }  }\)

Symbol English Metric
\(\large{ \theta }\) = angle \(\large{deg}\) \(\large{rad}\)
\(\large{ BT }\) = back tangent \(\large{deg}\) \(\large{rad}\)
\(\large{ c }\) = chord length \(\large{ft}\) \(\large{m}\)
\(\large{ E }\)  = external distance \(\large{ft}\) \(\large{m}\)
\(\large{ FT }\) = forward tangent \(\large{deg}\) \(\large{rad}\)
\(\large{ l }\)  = length of curve \(\large{ft}\) \(\large{m}\)
\(\large{ M }\)  = middle ordinate \(\large{ft}\) \(\large{m}\)
\(\large{ \pi }\) = Pi \(\large{3.141 592 653 ...}\)
\(\large{ PC }\) = point on curve \(\large{ft}\) \(\large{m}\)
\(\large{ PI }\) = point of intersection \(\large{ft}\) \(\large{m}\)
\(\large{ PT }\)  = point on tangent \(\large{ft}\) \(\large{m}\)
\(\large{ r }\)  = radius of curve \(\large{ft}\) \(\large{m}\)
\(\large{ T }\) = subtangent \(\large{deg}\) \(\large{rad}\)

 

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Tags: Surveying