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This tutorial describes howthe modeling toprocess modelfor a composite bridge, composed withof a concrete slab over steel girders that havewith variable flange thickness.

*On
this page:*

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h1. Modeling Steps

The key idea is to assign nonprismatic girder sectionh1. Modeling steps

To obtain the variable flange thickness desired, users should assign non-prismatic girder sections to the bridge deck section to.
obtain
the
desired variation of flange thickness.

h2. Create Newnew Modelmodel from Templatetemplate

* UseSelect "File > New Model", select> "KN, m, C" units and> Quick Bridge template.

* Set span lengths to "'30; 30"', and select Steel Girder as the bridge deck -section type "Steel.
Girder"

h2. Define Nonprismaticnon-prismatic Steelsteel Girdergirder Sectionssections

* Select "Define > Section Properties > Frame Sections"
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** renameRename the default girder section "FSEC1" to "'GRD 50mm FLANGE" Flange'.
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** createCopy copythe of "'GRD 50mm FLANGE"Flange' section, change the thickness for the top and bottom flanges to 75mm, andchange the section depth to 1.27m (tomaintaining consistency keepwith theprevious web depth the same as for the previous section)), and then save the section as "'GRD 75mm FLANGE"Flange'.
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** createSelect nonprismaticAdd sectionsNew "GRDProperty span1"> andFrame "GRDSection span2"Property (via "Add New Property" button, frame section property Other and [nonprismatic section|kb:nonprismatic section]) other) > Non-prismatic Section to create non-prismatic sections 'GRD span1' and 'GRD span2' as follows: (1) for "'GRD span1"', specify the "'GRD 50mm FLANGE"Flange' section for the first 20m of length, ofand the section and "'GRD 75mm FLANGE"Flange' section for the next 10m length of the sectionlength; (2) for "'GRD span2"', specify the "'GRD 75mm FLANGE"Flange' section for the first 10m of length, ofand the section and "'GRD 50mm FLANGE"Flange' section for the next 20m of length of the section:

. This process is shown in Figure 1: 

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!Variable_flange_thickness_i_girder_bridge_nonprismatic_section_span_1.png|align=center,border=0!

{center-text}Figure 1 - Section definition{center-text}


h2. Create Bridgebridge Deckdeck Sectionssections

* Use "the Bridge > Deck Section > Add Copy of Section" menu command to create bridge sections to be assigned to the first and the second spans of the bridge object. TheseName these sections will be named "SPAN1" and "SPAN2", and will utilize the previously -defined nonprismaticnon-prismatic girder sections "'GRD span1"' and 'GRD span2"', as shown below:in Figure 2:

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!Variable_flange_thickness_i_girder_bridge_deck_section_span_1.png|align=center,border=0!

{center-text}Figure 2 - Bridge section data{center-text}


h2. Assign Bridgebridge Deckdeck Sectionssections to the Bridgebridge Objectobject

* Use "the Bridge > Bridge Objects > Modify/Show Bridge Object > Modify/Show Assignments, Spans" menu command to assign the previously -defined bridge deck sections "SPAN1" and "SPAN2" to the first and second spans of the bridge object, spansas shown 1in andFigure 23:

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!Haunched_steel_girder_bridge_span_assignments.png|align=center,border=0!

{center-text}Figure 3 - Span assignments{center-text}

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* Set OpenGL graphics viausing the "Option > Graphics Mode > OpenGL" menu command

* Go toUse "View > Set Display Options > Show Extruded Shape" to display the extruded shape of the bridge (. Please note that there is a slight graphical display issuediscontinuity, butthough the frame elements are inserted such that the locations at the top -of-web thelocations web form a continuous line;. thisThis canmay be checked by reviewing the insertion point, which is (top center,) and offsets). The extruded view is shown in Figure 4:

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!Extruded view.png|align=center,border=0,width=1000px800px!

{center-text}Figure 4 - Extruded view{center-text}


h1. See alsoAlso

* [kb:Multiple sections within a single span]