This tutorial was written for SAP2000, but the same concept applies also to CSiBridge.


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.

Layout line geometry

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

Plan view


Figure 1 - Layout line plan view


Figure 2 - Plan view data

Elevation view


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:


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:


Figure 7 - Elevation view data


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