Building Information Modeling (BIM) | Nemetschek Allplan
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Building Information Modeling (BIM) | Nemetschek Allplan

Dlubal Software has set a goal to allow you to plan according to BIM. And this mission was undoubtedly successful!

Due to the numerous interfaces in the structural analysis programs RFEM and RSTAB, you can easily and conveniently exchange data with the common industry software (such as CAD programs).

With the file format ASF from Nemetschek, RFEM 6 supports a popular CAD program. Thus, you have various options for the data exchange.

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Import options in RFEM 6

Import in RFEM

You can import one or more surfaces to RFEM using IFC files. Thus, the structural data, such as nodes, lines, or material, are exported.

For example, you can export the floor plans as DXF and display them as a background layer in RFEM.

Feature 001692 | Export to Allplan

Export to Allplan

A reinforcement determined in RF-CONCRETE can be exported with an ASF file to Allplan. Allplan displays the reinforcement contours and FEA reinforcement color images.

If reinforcement is placed in the surface, the FEA reinforcement color images are adjusted, meaning that the reinforcement values of the placed reinforcement are substracted from the values of the required reinforcement.

Videos
Models to Download
Knowledge Base Articles
"Failure all if PZ' Negative" Nonlinear Support
Supports contributing to a load reduction only under compression or tension can be defined as nonlinear supports in RFEM and RSTAB. It is not always easy for the user to select the correct nonlinearity for "failure under tension" or "failure under compression".
"Spring" Member Type 
The RFEM5 and RSTAB8 programs offer a "Spring" option when defining a member under the member types.
Deactivating Nonlinear Effects
If nonlinear effects - such as failing supports, foundations, member nonlinearities, or contact solids - are used in the model, you can deactivate them in the global calculation parameters.
Saving and Importing Diagrams for Member Hinges
In RFEM 5 and RSTAB 8, it is possible to assign nonlinearities to member hinges. In addition to the nonlinearities "Fixed if" and "Partial activity", you can select "Diagram". If you select the "Diagram" option, you have to specify the according settings for the activity of the member hinge. For the individual definition points, it is necessary to specify the abscissa and ordinate values (deformations or rotations and the according internal forces) that define the hinge.
Screenshots
Product Features
Feature 002905 | RVE Material Model for Fabric Materials

The "Orthotropic | Fabric | Nonlinear Elastic (Surfaces)" material model allows you to define prestressed fabric membranes using the representative microstructure-solid element model – RVE.

By considering the fabric geometry in the microstructure model, the corresponding transversal strain effect can now be considered for all force conditions in the membrane.

Feature 002421 | Displaying Result Values on Isolines

Result values for deformations, internal forces, stresses, and so on, can be displayed on the isolines.

Isometric Display of Spatial Yield Surface (Source: Explanatory Report on Research Project "DDMaS - Digitizing the Design of Masonry Structures"

Did you know that To calculate masonry structures, a nonlinear material model has been implemented in RFEM. It is based on the approach of Lourenco, a composite yield surface according to Rankine and Hill. This model allows you to describe and model the structural behavior of masonry and the different failure mechanisms.

The limit parameters were selected in such a way that the design curves used correspond to a normative design curve.

Slab-Wall Connection in RFEM

RFEM allows you to use a special line hinge to model the special properties of the connection between the reinforced concrete slab and masonry wall. This limits the transferable forces of the connection depending on the specified geometry. You guess right: This means that the material cannot be overloaded.

The program develops interaction diagrams that are applied automatically. They represent the various geometric situations and you can use them to determine the correct stiffness.

Frequently Asked Questions (FAQ)
How does the "Orthotropic Plastic" material model work in RFEM?
There are two different add-on modules for a response spectrum analysis in RF‑/DYNAM Pro. What is the reason for the differences in the results of both modules?
I would like to define a line support with ineffective tension and apply the tension force on this line using a nodal support instead. Why does the line support still receive a tension force?
I obtain different results when comparing the deformation analysis in the RF‑CONCRETE add-on modules and another calculation program. What could be the reason for this?
In a nonlinear structural system, some load cases do not converge. However, load combinations can be calculated without problems. Why?
How can I incrementally apply the load of a load case to the model?
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