The clothoid type layout elements are defined not just by their origin and initial azimuth, but also by their input and output radio and their parameter. Provided that the following is complied with:
where L is the length of the clothoid, A is the parameter and R is the radius. The clothoids may be defined between a straight line and a curve (Re=y Rs=R), between a curve and a straight line (Re=R y Rs=) or between two curves (Re=R1 and Rs=R2).
The coordinates sow in the Details dialogue of the command Edit Alignment
are:
O. Link circle centre.
Te. Input tangent of the curve.
Ts. Output tangent of the curve.
PI. Tangent intersection point.
On the other hand, the magnitudes indicated are as follows:
X. X-alignment of the final point.
Y. Final point ordinate.
X0. X-alignment of the center.
Y0. Ordinate of the center.
Tc. Short tangent.
Tl. Long tangent.
Tau. Angle formed by the two tangents at the vertex.
IncR. Setback.
For the clothoids a discretization is drawn of the theoretical curve by means of a polyline. The drawing interval may be specified on the configuration. This parameter only affects the representation as the results are always calculated analytically.
The polyline representing a clothoid can be copied, revolved and moved using the CAD commands. The modifications to individual vertices are not taken into account. To modify the length of a clothoid the command Edit Clothoid must be used.
TcpMDT
y Rs=R), between a curve and a straight line (Re=R y Rs=
