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{live-template:Tutorial}

This\\
tutorial
illustrates how custom*Custom cross sections* canmay be created in the section designer [Section Designer|kb:Section Designer] using polygon shapes. In*polygonal shapes*. [Interactive database editing|kb:Interactive database editing] enables the efficient modification of section geometry. To demonstrate, this tutorial weprovides willguidelines createfor a cross-section ofmodeling an AASHTO I-Beam Type I section using the sectionSection designerDesigner.

Use "
The [modeling|kb:Modeling techniques] process is as follows:

* Create a new section by selecting Define > Section Properties > Frame Sections > Add New Property".
to create a new section.
* Select "Other" as Frame Section Property Type > Other, andthen click on the Section Designer button to open the "SD Section Data" form.
Then
click* onSelect the "Section Designer..." button to launch the Section Designer.
We
will* useInitialize 1"1in grid spacing to help us draw the section. GoSelect to "Options > Preferences", andthen set the "Background Guideline Spacing" to 1212in inchesand andthe "Fine Grids between Guidelines" to 11, as shown in Figure 1:

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!fig 01 get guidelines.png|hspace=30px!

Use "align=center,border=0!

{center-text}Figure 1 - Guideline and Fine grid spacing{center-text}

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* Select Draw > Draw Poly Shape", menuthen command and draw the section by snapping on theintersecting grid intersections. lines, as shown in Figures 2 and 3:

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!fig 02 draw section.png|hspace=30px!

align=center,border=0!

{center-text}Figure 2 - Draw section{center-text}

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!fig 03 completed section.png|hspace=30px!

Using "Draw > Reshape Mode", you canalign=center,border=0!

{center-text}Figure 3 - Section drawn{center-text}

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* Save the model, then switch to reshape mode which will enable you to reposition the points onby selecting Draw > Reshape Mode. Any section point may now be repositioned within the cross- section. To do so, first clickby clicking on the section, andthen thenby clickclicking on the black squaressquare and atholding sectionthe points,button keepdown thewhile mousedragging rightto mousethe buttonnew pressedposition, andas dragshown themin toFigure the4:
new
position.\\

!fig 04 reshape mode.png|hspace=30pxalign=center,border=0!

Once you save the section, it is possible to reshape the cross-section directly within the section designer, however you would need to use{center-text}Figure 4 - Reshape mode{center-text}

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Additional points may be added along the cross-section boundary by using [interactive database editing|kb:Interactive database editing] to add additional points on the cross-section boundary.
To
illustrateFor thisexample, let use interactive database editing to add a slab above the beam.

First, opena [slab|kb:Shell] may be adjoined above the girder through the following process:

* Open interactive database editing by viaselecting "Edit > Interactive Database Editing".

* Select the three tables under "MODELModel DEFINITIONDefinition > Property Definitions > Section Designer Properties", andthen clickselect OK, as shown in Figure 5:

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!fig 05 interactive database editing.png|hspace=30px!

Click on the "To Excel" button to export thealign=center,border=0!

{center-text}Figure 5 - Interactive database editing{center-text}

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* Select To Excel, as shown in Figure 6, to [export|kb:Export] this data to Excel.

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!fig 06 to excel.png|hspace=30pxalign=center,border=0!

{center-text}Figure 6 - To Excel{center-text}

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* In Excel, add additionalanother 4four points representing to represent the perimeter of the slab, andthen clickselect "From Excel" button. TheThese four new points wereare addedthen towithin the section definition., as shown in Figure 7:

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!fig 07 from excel.png|hspace=30pxalign=center,border=0!

{center-text}Figure 7 - From Excel{center-text}

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* Open the section inwithin the section designer [Section Designer|kb:Section Designer] to display the final cross-section section, as shown in Figure 8:

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!fig 08 resulting section.png|hspace=30px!align=center,border=0!

{center-text}Figure 8 - Final section{center-text}