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Horiz Curve Calcula-
tor,
Results page
Horiz Curve Calcula-
tor,
Areas page
524
Field
Option
DOC - Chord
Arc length
Tangent
External
secant
Mid ordi-
nate
Delta angle
Next step
Calculate calculates the result and accesses Horiz Curve Calculator, Results.
Key
Description
OK
To accept changes and return to Horiz Curve Calculator,
Input page.
Page
To change to another page on this panel.
Description of fields
d3
d2
d5
d4
P2
P0
TS_132
Key
Description
OK
To accept changes and return to the Input page.
Page
To change to another page on this panel.
Description
The degree of curve defines the sharpness or
flatness of the curve. Degree of curvature in
chord definition. The central angle subtended
by one station length of chord. Used in rail-
way design.
Total length of the circular curve from start
point to end point measured along its arc.
Length of the tangent from the tangent
point to the point of intersection.
The distance from the point of intersection
to the midpoint of the curve. The external
distance bisects the interior angle at the
point of intersection.
The distance from the midpoint of the curve
to the midpoint of the long chord. The exten-
sion of the middle ordinate bisects the cen-
tral angle.
The angle where the two tangents intersect.
The angle between the tangents is also
equal to the angle at the centre of the curve
α
P1
P0 Start point
P1 End point
P2 Second point
r
d1
r
d1 Chord length
d2 Arc length
d3 Tangent
d4 Mid ordinate
d5 External secant
Delta angle
Radius
COGO
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