RFEM/RSTAB BIM link for member design

By following this step-by-step tutorial, you will learn how to design and code-check a structural steel member using the BIM link between RFEM/RSTAB and IDEA StatiCa Member.

1 How to activate the link

IDEA StatiCa automatically integrates the BIM link into your CAD/CAE software during its installation. You can check the status and activate more BIM links for other software installed later in the BIM link installer.

Open IDEA StatiCa and navigate to the panel BIM and open the BIM link installer. A notification "Run as administrator" may appear, please confirm with the Yes button.

Select the software to integrate the IDEA StatiCa BIM link, click the Install button and check the status.

Note: RFEM/RSTAB BIM link provides importing only under the Eurocode (EN) standard.

2 How to use the link

First, open the source file RFEM.rf5 from the provided files for download (at the bottom of this tutorial) and open it in RFEM/RSTAB. There navigate to menu Add-on Modules then External Modules and run IDEA Statica Steel.

The Code-check manager opens and you can start the import process. Select one beam or column in the RFEM/RSTAB model and click Member to import it for the analysis in IDEA StatiCa Member under the EN code.

The member is added to the list together with corresponding joints and by selecting it the wireframe model together with the tab of cross-sections is displayed. In this step, you can manage the imported load cases or import additional dynamic load cases. Leave the default settings and start configuring the connections first.

3 Design

Select node 22 in the list, click Finish, and open it in the Connection module to configure the connections by following the tutorial BIM link tutorial Connection - RFEM/RSTAB (EN) from chapter 3 on.

After that, select the node 23, again click Finish and open it to design the connections.

Instead of designing all the connections of this joint by adding the operations, take advantage of the predefined template from the provided files for download in this tutorial.

Open the template Manager and import the template into your IDEA StatiCa template database.

Then click Apply and select the template.

And select the default bolt assembly for this connection item.

The design template is applied and you can just click Save and close the Connection module,  or you can run the analysis now and code-check the joint as well.

You have configured and designed both joints that are a part of the analyzed member. Now select the member in the list and click Finish.

And open it in the Member module.

All the data such as geometry and loads have been imported, and all connections have been already designed. The model is ready to be analyzed, but first, let's add some openings to the web of the member. Right-click on Operations in the tree menu and pick the operation Opening.

Edit the parameters of the operation, change the size and shape to N-gon (polygon with n sides) and multiply the openings number.

4 Check

Move to the Check tab, select the MNA (Materially Nonlinear Analysis) and start the analysis by clicking Calculate in the ribbon. The analysis model is automatically generated, the calculation is performed and you can see the overall check displayed together with basic values of check results.

In the next step, switch the CBFEM analysis type to LBA (Linear buckling analysis) and run the analysis again by clicking Calculate.

When the analysis is finished, you can browse the buckling shape factors in the tab, and by selecting some, e.g. buckling shape 1, you can see it visualized in the 3D window. Selecting the Uy results display highlights the deformation trend. 

Now you can calculate the GMNIA (geometrically and materially non-linear analysis with imperfections). According to EN 1993-1-1, choose the most critical buckling shape or a combination of buckling shapes and input the initial imperfection of the critical beam. In this case, the buckling shape 1 is the most critical one. Switch to the GMNIA tab in the right panel and determine the imperfection of 10 mm (0,5xL/300 = 0,5*6000/300 = 10 mm) to type in as the Amplitude in column 1. Click the Calculate button, for this analysis, the calculation may take several minutes.

The member passed the code-checks with applied initial imperfections and we can browse the results such as stress distribution and internal forces diagram.

5 Report

At last, go to the tab Report. IDEA StatiCa offers a fully customizable report to be printed out or saved in .doc editable format.

You have imported a member from RFEM and designed and code-checked it according to Eurocode (EN).

6 Synchronize models

Save the project in IDEA StatiCa Member and close it. All structural details imported from RFEM/RSTAB project to IDEA StatiCa are kept on the list. The Code-check manager provides useful commands for further processing of the imported items.

To demonstrate the synchronize function, change the cross-section of the analyzed member.

Then, recalculate the project in RFEM/RSTAB and open the Code-check manager again.

Select the member from the list and click Synchronize all.

The geometry and load effects were updated and you can click Open to check the project item.

IDEA StatiCa opens and you can see the updated geometry while the design operations keep the settings.

You can check and adjust the design, recalculate and code-check the member, save and close it. Then you can continue importing and code-checking more joints or members.

Bekannte Einschränkungen für RFEM/RSTAB

Derzeit funktioniert der Link für eine Vielzahl von Verbindungen/Anschlüssen. Bitte berücksichtigen Sie jedoch noch nicht unterstützte Funktionen.


Einschränkung: Die RFEM / RSTAB-BIM-Schnittstelle ermöglicht nur den Export von Verbindungen und Bauteilen unter dem Eurocode (EN).

Workaround:  N/A, andere Normen werden in zukünftigen Versionen von IDEA StatiCa eingeführt.


Einschränkung: Das Exportieren von Mehrfachauswahlen von Knoten und/oder Bauteilen aus RFEM/RSTAB nach IDEA StatiCa funktioniert nicht.

Workaround: N/A, nur eine einzelne Auswahl eines einzelnen Knotens und eines entsprechenden Bauteils oder eines einzelnen Bauteils ist für den Export auf der Seite von RFEM/RSTAB zulässig.


Einschränkung: Geometrische Exzentrizität - Der Anschlussknoten befindet sich nicht im Mittelpunkt.

Workaround: RFEM/RSTAB bietet mehr Möglichkeiten zur Eingabe von Exzentrizitäten. Die Eingabe der Exzentrizität unter Verwendung der lokalen x-, y- und z-Koordinaten verursacht aufgrund der Vielzahl von Koordinatensystemoptionen in RFEM/RSTAB Schwierigkeiten bei der Transformation der Daten in IDEA StatiCa. Verwenden Sie stattdessen die Eingabe der Exzentrizität der globalen X-, Y- und Z-Koordinaten.


Einschränkung: Das Exportieren eines Trägers mit einem verstärkten Ende oder einer anderen Art von konischen oder anderen geformten Trägerenden ist nicht möglich.

Workaround:  Die Voute wird vernachlässigt und kann anschließend in IDEA StatiCa modelliert werden

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