Further Information

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• When running PLATE‑BUCKLING as a stand‑alone program or as an add‑on module within RFEM/RSTAB, the "from RFEM" or "from RSTAB" button is grayed out.

If the PLATE‑BUCKLING add-on module is not opened as a stand-alone version, but via RFEM or RSTAB, it is possible to import the panels (c/t parts of a member cross-section) and the respective load cases of the RFEM or RSTAB model to PLATE‑BUCKLING (see the figure).

If there are no valid cross-sections of PLATE‑BUCKLING found in the model file of RFEM/RSTAB, the option for importing the buckling panels remains inactive.
• Is it possible to design tapered members or trapezoidal panels with the FE-BEUL add-on module?

With the PLATE-BUCKLING add-on module, you can only calculate rectangular buckling panels.

The panel is entered via 1.1 of the add-on module. Alternatively, the panel can also be created from an existing RFEM or RSTAB file by selecting the respective c/t-part.
• Is it possible to import the effective lengths from RF-STABILITY or RSBUCK in RF-/TIMBER Pro?

Yes, that is possible.

First, RF-STABILITY (or RSBUCK in RSTAB 8) can be used to determine the effective lengths for a particular structure and loading.

They can then be imported in the 'Effective Lengths' of the RF-/TIMBER Pro dialog box.

• In PLATE‑BUCKLING, the reduction factor due to column buckling χc is calculated using the modified slenderness of the sheet metal ${\overline{\mathrm\lambda}}_{\mathrm p}$. Why is it not calculated using the slenderness of the equivalent compression member ${\overline{\mathrm\lambda}}_{\mathrm c}$ ?

RF-PLATE-BUCKLING performs the plate buckling analysis in compliance with Chapter 10 "Reduced Stress Method" of EN 1993‑1‑5. According to EN 1993‑1‑5, 10 (5) a), it is necessary to determine all reduction factors with the modified slenderness ratio of the sheet metal ${\overline{\mathrm\lambda}}_{\mathrm p}$ according to Equation (10.2).
• How can I perform a buckling analysis for a surface in RFEM?

If you want to perform a buckling analysis with shell elements, the add-on modules RF‑STABILITY, RF‑IMP, and RF‑STEEL Surfaces are required.

Determining governing load according to the linear static analysis
The results of the governing CO are then used in RF‑STABILITY to determine the lowest mode shape (local deflection / buckling of surface).
With the result of RF‑STABILITY, you can generate a pre‑deformed structure in RF‑IMP by scaling the mode shape to a maximum ordinate (maximum value of the initial deformation). An engineer has to define the maximum value of the initial deformation.
Now, you can copy the governing CO and design this according to the second-order analysis while considering the pre-deformed structure of RF‑IMP.
The results are then used to perform the stress analysis in RF‑STEEL Surfaces.

The attached video shows the general procedure again.

There are already some very interesting technical articles on this topic on our website.

If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

Wind Simulation & Wind Load Generation

With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.

The generated wind loads acting on these objects can be imported to RFEM or RSTAB.

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