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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND 2, 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.
RFEM 6 offers you the Building Model add-on for defining a building by means of stories. It is an advantageous tool for modeling, given that the stories can be adjusted in many ways afterwards. Some of its most important features are:
RWIND 2 is a program for generating wind loads based on CFD (Computational Fluid Dynamics). The wind flow numerical simulation is generated around any building including irregular or unique geometry types to determine the wind loads on surfaces and members. RWIND 2 can be integrated with RFEM/RSTAB for the structural analysis and design or as a stand-alone application.
The “Modal Analysis” add-on in RFEM 6 allows you to perform modal analysis of structural systems, thus determining natural vibration values such as natural frequencies, mode shapes, modal masses, and effective modal mass factors. These results can be used for vibration design, as well as for further dynamic analyses (for example, loading by a response spectrum).
In RFEM 6 it is possible to define multilayer surface structures with the help of the “Multilayer Surfaces” add-on. Hence, if you have activated the add-on in the model’s Base Data, it is possible to define layer structures of any material model. You can also combine material models of, for example, isotropic and orthotropic materials.
This Knowledge Base article discusses different methods for a stability analysis (Image 01) provided in EN 1993-1-1:2005  and their application in the RFEM 6 program. The example used to demonstrate these methods (Image 01) is based on the work of E. Chladný and M. Štujberová  provided at the end of this article under “References”. It is important to note that lateral-torsional buckling is excluded in this example and the verifying procedure is explained in the following paragraph.
The API for RFEM 6, RSTAB 9, and RSECTION is based on the WebService concept. To get a good introduction to the subject, the following article will explain a further example in C#.
The properties of the connection between a reinforced concrete slab and a masonry wall can be correctly considered in the modeling using a special line hinge that is available in RFEM 6. This special type of a line hinge limits the transferable forces of the connection depending on the specified geometry, and thus the material cannot be overloaded. In this way, you can control the parameters of a line hinge to limit the transmission of moments. This is necessary for the slab-wall connections in masonry structures, as the moments are not transferred indefinitely here, but only depending on the axial forces.
The connection between surfaces that touch each other on one line must be considered correctly in the modeling. This can be done by defining a line hinge on the boundary line between the surfaces. A line hinge allows you to control the transfer of the internal forces from one surface to the next by defining certain degrees of freedom. For instance, a line hinge in a concrete structure can be used to define an assembly gap. In timber structures, this element is required due to the very limited rotation transmission of forces.
When two or more parallel surfaces are connected, the connection must be adequately considered in the modeling. For that purpose, RFEM 6 offers “Surface Contacts” as a feature that helps you describe the contact properties between surfaces in your model that are at a distance from each other. It is possible to define various surface contact types to control the transfer of forces between the surfaces with no need to create a contact solid between them, as was the case in RFEM 5.
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