# Knowledge Base

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#### 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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1. ## Creation of a user-defined antenna support for RF-/TOWER attachments

New

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In the following, the creation of a user-defined antenna support for use in RF-/MAST extensions is described in detail.

2. ## Creating a User-Defined Platform for Use in RF-/TOWER Equipment

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The following technical article describes the creation of a user-defined platform for use on a four-sided tower in the RF-/TOWER add-on modules. First, start with an empty model of the type 3D and define four nodes. The numbering and position of these nodes are very important here.

3. ## Comparing Critical Load Factors for Lateral-Torsional Buckling According to Different Methods and Modules

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The critical factor for lateral-torsional buckling or the critical buckling moment of a single-span beam will be compared according to different stability analysis methods.
4. ## Warping Torsion Analysis According to AISC Design Guide 9

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The design of a torsional loaded beam according to AISC Design Guide 9 will be shown based on a verification example. The design will be performed with the RF-STEEL AISC add-on module and the RF-STEEL Warping Torsion module extension with 7 degrees of freedom.
5. ## Consideration of Holes in Tension Design

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For the tension design according to Clause 6.2.3 EN 1993-1-1, the following formulas are given to determine the tension resistance.

$\begin{array}{l}\mathrm{Equation}\;6.6:\;{\mathrm N}_{\mathrm{pl},\mathrm{Rd}}\;=\;\frac{\mathrm A\;\cdot\;{\mathrm f}_\mathrm y}{{\mathrm\gamma}_{\mathrm M0}}\\\mathrm{Equation}\;6.7:\;{\mathrm N}_{\mathrm u,\mathrm{Rd}}\;=\;\frac{0.9\;\cdot\;{\mathrm A}_\mathrm{net}\;\cdot\;{\mathrm f}_\mathrm u}{{\mathrm\gamma}_{\mathrm M2}}\end{array}$
6. ## Limit Values for Stability Analysis in RF-/STEEL EC3

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As of the program version X.11, the filter options of small compression forces or moments for stability analysis in RF-/STEEL EC3 have been revised. The revision of these filter options in the 'Stability' tab of the 'Details' dialog box allows you to work in the module transparently since they are now independent of the design.

7. ## Design and Stabilization of Beams Susceptible to Lateral-Torsional Buckling According to Eurocode 3 and AISC

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A single-span beam with lateral and torsional restraint is to be designed according to the recommendations of Eurocode 3 and AISC. If the beam does not reach the required load-bearing capacity, it must be stabilized.

8. ## Limit Loads in Special Cases

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For situations where no design is available, RF-/STEEL EC3 provides the option to neglect the respective internal forces. Examples of such situations are:

• Bending and compression on angle sections,
• Multi-axial bending for the design according to General Method,
• Torsion.
9. ## Determination of Effective Widths According to EN 1993-1-5, Annex E

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Eurocode 3 provides Table 5.2 for the classification of cross-section parts supported on one or two sides and various load situations. Generally, the determination of effective widths is based on the limit stresses of the structural steel used. However, in DIN 18800, the b/t limits were determined on the basis of the actual stresses in the cross-section. Thus, unfavorable limits may arise, especially for stresses below the yield strength, according to Eurocode 3.

10. ## Extrude Surfaces

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In order to create a solid, you can right‑click the surface and then extrude it. The procedure is shown in the figure.

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