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This tutorial explains how to define horizontal and vertical layout -line geometry can be defined in [SAP2000|sap2000:home]. TheLayout layoutlines line isare broken into a number of segments between the transition points, (PT -including point of tangent (PT), PC - point forof curvature, PVT - (PC), point of vertical tangent (PVT), PVC -and point of vertical curvature (PVC). and eachEach segment is defined using the parameters available in the relevant SAP2000 formmenu.

*Onh1. thisLayout page:*line geometry
{toc}
Plan h1.and Layoutelevation lineviews geometryof 
Athe sample baselinelayout toline beused enteredin intothis SAP2000tutorial isare describedpresented inwith thecorresponding followingdata twosets sections.below:

h2. Plan view
Horizontal
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!horizontal alignment.png|align=center,border=1!

{center-text}Figure 1 - Layout line plan view{center-text}

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!horizontal alignment table.png|align=center,border=1!

{center-text}Figure 2 - Plan view data{center-text}

h2. Vertical ProfileElevation view

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!vertical alignment.png|align=center,border=1!

{center-text}Figure 3 - Layout line elevation view{center-text}

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!vertical alignment table.png|align=center,border=1!

{center-text}Figure 4 - Elevation view data{center-text}

h1. Data to be entered to SAP2000

in SAP2000

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

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!baseline geometry in SAP2000.png|align=center,border=1!

{center-text}Figure 5 - Baseline geometry in SAP2000{center-text}

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Select 'Define Horizontal Layout Data' to enter plan view geometry. Each row inof the SAP2000 table belowin isFigure used6 todefines define one segment of the horizontallayout-line alignmentplan as follows: 

* TheRow first1 rowdefines indicates that the initial bearing isas N 90° 0′ 0″ E.
* TheRow 2nd2 rowdefines definesa straight segment, 100m long, which extends atfrom the previous bearing, ie. (N 90° 0′ 0″ E).
* TheRow 3rd row3 defines the first curved segment. For our alignment, there are no transition curves as the entire second segment which has a constant radius of 100m. Therefore,Since wecurvature needis toconstant, enterthere theare endno bearingtransition such that it exactly corresponds to the final station for the segment. In general, either the curves, meaning either radius or the end bearing is sufficient to define a circularfor curve with constant radiusdefinition. *If you specify radius and end bearing that do not represent a circular segment with constant curvature, then anthe arc ofgenerated the specified constant iswill be centered withinin the range specified station range. If this arc length is lessshorter than the difference in stations, transitionstransition are created of where the curvature varies curves, varying linearly from 1/R atto eachzero, endwill ofconnect the arc to zero at the corresponding station end pointpoints.*
* TheRows description4-6 offollow the nextsame three rows is similar toprocedure as the previous (3) rows.

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!horizontal data in SAP2000.png|align=center,border=1!

{center-text}Figure 6 - Plan view data{center-text}

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Select 'Define Vertical Layout Data' to enter elevation view geometry. Each row inof the SAP2000 table belowin isFigure used7 to definedefines one segment of the verticallayout-line alignmentelevation as follows: 

* TheRow first1 rowdefines liststhe initial elevation and the initial grade as entered on the "Bridge Layout Line Data" form.. 
* TheRow 2nd2 rowdefines definesa constant slope (of 20% segment) up to station 100.
* TheRow 3rd3 rowdefines definesa parabolic segment with an initial slope of \+20% and an end slope of \-20%.
* Finally,Row the4 4thdefines row definesa constant slope of (-20% segment) up to station 614.16.

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!vertical data in SAP2000.png|align=center,border=1!

{center-text}Figure 7 - Elevation view data{center-text}

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