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Fredrik Lagerström 6.1 1 {{box cssClass="floatinginfobox" title="**Contents**"}}
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5 In [[image:1584966479348-701.png]] //3D Structure// module, straight and arc bars (**Beams** and**// //Columns**) can be modeled more accurately for stability, utilization check (against flexural, torsional, lateral torsional and local buckling) and design according to their EC by modeling them with planar shell members.
7 **Definition steps**
9 1. Press //Analytical model / Shell model// option of //Beam //or //Column// toolwindow and choose the bar. By default, selecting a bar element generates a complex 3D model built by a group of steel plates derived from the geometry of the selected bar’s profile. All converted plates inherit the original bar element’s steel material.
10 [[image:1584966490188-464.png]]
11 Figure: Straight bars with constant cross-section(((
12 |(% style="width:110px" %)[[image:warning.png]]|(% style="width:1340px" %)(((
Fredrik Lagerström 9.1 13 After converting a bar to shell model, the program automatically defines “rigid” **Fictitious bar// //**objects at the ends of the shell model to guarantee continuous connection to other objects line 1D members, point supports and point loads. The stiffness of these fictive elements can be modified with the [[image:1584966598815-325.png]] //Properties// tool of //Fictitious bar// command. Alternatively, this function can be turned off by clicking [[image:1584966604683-486.png]] after selecting //Analytical model// in the //Beam //or //Column// toolwindow.
Fredrik Lagerström 6.1 14 )))
16 [[image:1584966535998-531.png]]
19 |[[image:light.png]]|Depending on, //Beam//, //Column// or //Truss member// was converted to shell model, the model can be hidden together with the //Beam//, //Column //or //Truss member// object layer.
20 )))
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