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Wind Simulation & Wind Load Generation

With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures 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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• ### Eigenvalue Methods in RF-STABILITY

The RF-STABILITY add-on module determines the critical load factors, effective lengths and mode shapes of RFEM models. The stability analyzes can be carried out according to various eigenvalue methods, which have their advantages depending on the system and computer configuration.

• ### Activating Internal Member Division for Stability Analysis

When analyzing structural elements susceptible to buckling by using the modules RF‑STABILITY (for RFEM) or RSBUCK (for RSTAB), it might be necessary to activate the internal division of members.

• ### Find Mode Shapes From Critical Load Factor

The function, which is also known as shifting, allows you to calculate critical load factors beyond a user‑defined initial value. A determination of the critical load factors is usually done from the smallest to the greatest critical load factor.

• ### Finding System Instabilities

A calculation break‑off due to an instable system can have different reasons. On the one hand this can indicate a ‘real’ instability due to an overloading of the system, on the other hand the error message can result from inaccuracies in the model.

• ### Determination of Ideal Spring Stiffness for Lateral Supports of Buckling Members

If a member is laterally supported to prevent buckling due to a compressive axial force, it must be ensured that the lateral support is actually able to prevent buckling. Therefore, the aim of this article is to determine the ideal spring stiffness of a lateral support using the Winter model.

• ### Lateral-Torsional Buckling in Timber Construction | Examples 2

The previous article Lateral-Torsional Buckling in Timber Construction | Examples 1 explains the practical application for determining the critical bending moment Mcrit or the critical bending stress σcrit for a bending beam's lateral buckling by using simple examples. In this article, the critical bending moment is determined by considering an elastic foundation resulting from a stiffening bracing.

• ### Steel Frame Considering Connection Stiffness

This technical article analyzes the effects of the connection stiffness on the determination of internal forces as well as the design of connections using the example of a two-story, double-spanned steel frame.

• ### Lateral-Torsional Buckling in Timber Construction | Examples 1

The article Lateral-Torsional Buckling in Timber Construction | Theory explains the theoretical background for the analytical determination of the critical bending moment Mcrit or the critical bending stress σcrit for the lateral buckling of a bending beam. The following article uses examples to verify the analytical solution with the result from the eigenvalue analysis.

• ### Calculating Effective Lengths on the Example of a Double-Story Frame

With the RF-STABILITY or RSBUCK add-on modules for RFEM and RSTAB, it is possible to perform eigenvalue analyzes for member structures in order to determine the effective length factors. The effective length coefficients can then be used for the stability design.

• ### Lateral Torsional Buckling of a Principal Beam with I-Section According to EN 1993-1-1

This example was described in technical literature [1] as Example 9.5 and in [2] as Example 8.5. A lateral-torsional buckling analysis must be performed for a principal beam. This beam is a uniform structural member. Therefore, the stability analysis can be carried out according to clause 6.3.3 of DIN EN 1993-1-1. Due to the uniaxial bending, it would also be possible to perform the design by the general method according to clause 6.3.4. In addition, the determination of Mcr on the idealized member model will be validated by means of an FEA model within the framework of the methods mentioned above.

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