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Superelevation

Superelevation. Shaping. Shaping is the process of placing complex shapes into a design file to represent an area of pavement slope. Shapes can be either non-transitional or transitional. Non-transitional shapes have a constant slope the entire length of the shape.

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Superelevation

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  1. Superelevation

  2. Shaping • Shaping is the process of placing complex shapes into a design file to represent an area of pavement slope. • Shapes can be either non-transitional or transitional. • Non-transitional shapes have a constant slope the entire length of the shape. • Transitional shapes have a different slope at each end of the shape, and GEOPAK will linearly or parabolically interpolate between. Transitional types would be used for super-elevation transition areas.

  3. 3% 3% 2% 2% 2% 2% 0% 2% 0% -1% Pavement Shapes

  4. Shape Clusters • Every shape has four attributes,depending upon how you want to define your Profile Grade Line. • Baseline • Profile • Tie • PGL-Chain (Optional)

  5. Shape Clusters • Every shape has four attributes,depending upon how you want to define your Profile Grade Line. • Baseline • Profile • Tie • PGL-Chain (Optional) • A group of shapes that have the same attributes is referred to as a “Shape Cluster”.

  6. Pavement Shapes baseline = Route50 profile = Route50pr tie = -30 tie = 30 profile = Route50pr baseline = Route50

  7. Dependent and Independent Shapes • There are two types of shapes, DEPENDENT and INDEPENDENT, which refer to how elevations on the pavement surfaces are calculated. • Elevations on pavement surfaces represented by DEPENDENT shapes are determined directly from the profile. • Elevations on pavement surfaces represented by INDEPENDENT shapes do not rely on the proposed profile, but are connected to the adjacent shape.

  8. Dependent and Independent Shapes C -3.0% (INDEPENDENT) -3.0% B (DEPENDENT) -2.0% -2.0% A 575 PGL PGL 2.0% A 3.0% B C

  9. Dependent and Independent Shapes C -3.0% (DEPENDENT) -3.0% B (INDEPENDENT) -2.0% -2.0% A 575 PGL PGL 3.0% A 3.0% 2.0% B C

  10. Superelevation Example

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