# 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

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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. ## Determining the Contact Force Between Two Inclined Objects

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This article describes how to determine the contact force between two objects behaving like walls that are inclined at a certain angle on top of each other. To determine this contact force, define a nodal release. Since a nodal release requires certain conditions, this article shows two examples.

3. ## Modeling and Calculating a Floating Body with RFEM

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To correctly model and calculate floating bodies (special rafts, pontoons, floating jetties, dredgers, floating houses, inflatable islands, floating cranes, houseboats, et cetera), a two-stage calculation is necessary.

4. ## Modeling Containers by Generating a 3D Cell

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With the function "Generate Model - Members" → "3D Cell", it is very easy to generate containers (shipping containers, office containers, mobile homes, etc.) with regular and irregular distribution of the cells.
5. ## 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.
6. ## Consideration of Possible Contact Between Overlapping Members

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From time to time it happens that two intersecting beams overlap at a short distance.
7. ## Using Templates in VCmaster

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By using an interface, it is possible to export the RFEM/RSTAB printout report to VCmaster and continue editing there. VCmaster is a word processing program for engineers.

8. ## 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.

$\begin{array}{l}\mathrm{Equation}\;6.6:\;{\mathrm N}_{\mathrm{pl},\mathrm{Rd}}\;=\;\frac{\mathrm A\;\cdot\;{\mathrm f}_\mathrm y}{{\mathrm\gamma}_{\mathrm M0}}\\\mathrm{Equation}\;6.7:\;{\mathrm N}_{\mathrm u,\mathrm{Rd}}\;=\;\frac{0.9\;\cdot\;{\mathrm A}_\mathrm{net}\;\cdot\;{\mathrm f}_\mathrm u}{{\mathrm\gamma}_{\mathrm M2}}\end{array}$
9. ## Consideration of the correlation with wind loads

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If the wind load for buildings or structures is to be determined by the simultaneous assumption of aerodynamic pressure and suction coefficients on the windward and leeward sides of the building, the correlation of the wind pressure on zones D and E of the wall surfaces may be taken into account.
10. ## Export to VCmaster

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The printout reports created in RFEM and RSTAB can be transferred to VCmaster via an interface and further processed there. VCmaster (formerly BauText) is a word processing program for engineers. Calculations, drawings, photos and documents from various sources can be easily compiled, managed and used again with VCmaster.

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