Review 2
1
- The line joining the middle of the chord, C, with the middle of the curve subtended by this chord. a. Radius (R) - The radius of the curve. b. Intersection Angle (I) - The angle of deflection between the tangents. c. Long Chord (C) - The straight line joining the PC and the PT. d. Degree of Curve (D) - The angle subtended at the center of the curve by an arc 100 ft. or 20 m long. 2.2. Curve Formulas 2.3. Methods of Laying Out a Curve: 1. By the deflection angle method: Deflection angle is the angle subtended by the tangent and the chord drawn from the PC to the arbitrary point, P on the curve. Assume the chord/curve to begin and end with a sub-chord: Let d represents the central angle of the sub-chord whose length is less than 20 m D represents the central angle of the full chord whose length is equal to 20 m
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Transcript of Review 2
The line joining the middle of the chord, C, with the middle of the curve subtended by this chord.a. Radius (R) The radius of the curve.b. Intersection Angle (I) The angle of deflection between the tangents.c. Long Chord (C) The straight line joining the PC and the PT.d. Degree of Curve (D) The angle subtended at the center of the curve by an arc 100 ft. or 20 m long.
2.2. Curve Formulas
2.3. Methods of Laying Out a Curve: 1. By the deflection angle method:Deflection angle is the angle subtended by the tangent and the chord drawn from the PC to the arbitrary point, P on the curve.Assume the chord/curve to begin and end with a sub-chord:Let d represents the central angle of the sub-chord whose length is less than 20 m D represents the central angle of the full chord whose length is equal to 20 m
