Question
Download Solution PDFOffsets from the tangents method of curve setting can be adopted if _____________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFOffsets from tangents method is the linear method used for setting out simple circular curves on the roadway:
The offsets from tangents are calculated and set to get the required curve. The offsets can be either radial or perpendicular to tangents.
This method is adopted when both the deflection angle and radius of curvature are small
Radial Offsets: If the centre of the curve is accessible from the points on the tangent then this method of curve setting is used.
The radial offsets, Ox is given as:
The above expression is exact. However, an approximate value is given as
Perpendicular Offsets: If the centre of a circle is not visible, perpendicular offsets from tangent can be set to locate the points on the curve.
The perpendicular offsets, Ox is given as:
The above expression is exact. However, an approximate value is given as
OE = Ox
OD = R
OE = R - Ox
Radial Offset
⊥ offset = Ox
DE ⊥ T1D
OE = R
DE = OX
T1D = EE1
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