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This tutorial explains how to define horizontal and vertical layout-line geometry. Layout lines are broken into a number of segments between transition points, including point of tangent (PT), point of curvature (PC), point of vertical tangent (PVT), and point of vertical curvature (PVC). Each segment is defined using the parameters in the relevant menu.

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Plan and elevation views of the sample layout line used in this tutorial are presented with corresponding data sets below:

Plan view

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Figure 1 - Layout line plan view

Figure 2 - Plan view data

Elevation view

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Figure 3 - Layout line elevation view

Figure 4 - Elevation view data

Data to be entered in SAP2000

Data is entered using the Bridge Layout Line Data menu, shown in Figure 5: 

Figure 5 - Baseline geometry in SAP2000

Select Define Horizontal Layout Data to enter plan view geometry. Each row of the table in Figure 6 defines one segment of the layout-line plan as follows:

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• Rows 4-6 follow the same procedure as the previous three rows.

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Figure 6 - Plan view data

Select Define Vertical Layout Data to enter elevation view geometry. Each row of the table in Figure 7 defines one segment of the layout-line elevation as follows:

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• Row 4 defines a constant slope of -20% to station 614.16.

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Figure 7 - Elevation view data

This procedure generates the layout line diagrammed and described in the Layout line geometry section.