Answer:
In RFEM 5, the modeling option for couplings in the menu “Insert → Model Data → 1.31 Nodal Constraints” (Image 01) has been implemented to model elements with very high in-plane stiffness. This approach is mainly used in building engineering, where massive horizontal components (for example, floor slabs) justify such an assumption.
Since the “diaphragm” is used almost exclusively in buildings, this function has been transferred to the “Building Model” add-on in RFEM 6. There, you can select from four options to consider the stiffness (Image 02). Thus, the user can choose the model assumptions that best reflect the actual structural system.
A separate result configuration can be defined for each story. With the options “Rigid Diaphragm” or “Semi-Rigid Diaphragm”, slabs (2D analysis) can be modeled together with columns (nodal supports) and walls (linear supports) in a single model. The “Load Transfer Only” option simplifies the calculation by using only slabs for load transfer.
The building model thus represents an alternative to separate modeling of ceilings, in which the tool “Import Support Reactions as Load” was used beforehand. An initial analysis can be carried out using “Load Transfer Only” to determine global parameters, such as support reactions, stability, and the pre-dimensioning of the vertical main supporting elements.
Afterwards, you can activate the other functions of the add-on, for example, story modeling, ceiling sets, wall panels, and wall-like beams, om order to perform a more detailed analysis and design of the materials used (Image 04). However, since this advanced model requires more computing and processing power, a step-by-step approach is recommended. In this way, all components of a project can be integrated into just one model.
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