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Published byEsther Riley Modified over 2 years ago

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Superelevation

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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.

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

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

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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”.

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

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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.

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

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

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Dependent and Independent Shapes A GOOD RULE OF THUMB: ONE DEPENDENT SHAPE FOR EACH SHAPE CLUSTER.

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Longitudinal Edges and Filler Lines Since shapes are standard MicroStation complex shapes, they consist of a series of connected elements that form a closed surface. These element can be classified into two types: Longitudinal Edges – Typically, these consist of the roadway edges of pavement or lane lines. These line do not represent slopes. Filler Lines – These lines represent the beginning and ending slopes of a pavement shape. Each of these lines always represent a slope value.

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Longitudinal Edges and Filler Lines x x -2% 0% -2% 0%

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