Question
Why does my calculation in the RF‑/ALUMINUM add‑on module take so long?
![Manual Selection of Cross-Section Class](/en/webimage/010346/3014464/1_Manual_Definition_of_Cross-Section_Class.png?mw=512&hash=04f5243151ba895864e6d51f4e60d40867eaad56)
![Warping Restraint via End Plate](/en/webimage/010484/2978100/1_warping_restraint_from_end_plate.png?mw=512&hash=b43e17cbb11faa3b51820d5bc88f6c5f2d58db81)
![Basic Types of Cross-Section Parts](/en/webimage/014717/2944998/01-en.png?mw=512&hash=65e98cfe859ce35a3e3e9da47a0ef9335401520e)
![Model of Timber Platform](/en/webimage/039775/3498806/001819-01.png?mw=512&hash=e7f172e7dfaca53a2d2d7f5bdda41008f4f1c03d)
![Design of RSECTION Cross-Section Made of Aluminum](/en/webimage/032622/3674313/2024-01-02-08-08-03.png?mw=512&hash=8506d19b4f72c7f67893a86a07cd9c7937263a2b)
The Aluminum Design add-on provides you with further options. Here you can also design general cross-sections that are not predefined in the cross-section library. For example, create a cross-section in the RSECTION program and then import it into RFEM/RSTAB. Depending on the design standard used, you can select from various design formats. This includes, for example, the equivalent stress analysis.
With a license for RSECTION and "Effective Sections", you can also perform the design checks while taking into account the effective cross-section properties according to EN 1993‑1‑5.
![Tension Design Considering Reduced Cross-Sectional Area](/en/webimage/032623/3483707/002458_EN.png?mw=512&hash=d1c48a5906ec45a706170a31cee7bc2ac3ca4b52)
You know for sure that when connecting tension-loaded components with bolted connections, you need to consider the cross-section reduction due to the bolt holes in the ultimate limit state design. The structural analysis programs also have a solution for this. In the Aluminum Design add-on, you can enter a member local section reduction for this. Enter the reduction of the cross-section as an absolute value or as a percentage of the total area at all relevant locations.
![Cross-Section Design Considering Warping Torsion (7 Degrees of Freedom)](/en/webimage/032626/3483793/002459_EN.png?mw=512&hash=44537d9d653cac0dff6898c4928cad660e102063)
The Torsional Warping (7 DOF) add-on allows you to perform the calculation of member structures in RFEM and RSTAB, taking into account the cross-section warping. You can consider all internal forces (N, Vu, Vv, Mt,pri, Mt,sec, Mu, Mv, Mω) determined in this way in the equivalent stress analysis of the aluminum design. Note: This feature is not yet available for the design standard ADM 2020.
![Graphical Display of Mode Shape for Lateral-Torsional Buckling Analysis](/en/webimage/032627/3483692/002462_EN.png?mw=512&hash=6aa3edd092b156b2ffe85fa7752b91477e584758)
Did you use the eigenvalue solver of the add-on to determine the critical load factor within the stability analysis? In this case, you can then display the governing mode shape of the object to be designed as a result.