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• ### What is the Arbitration of New Elements in "Initial Position" and "Tangential" arrangement in RF-STAGES?

The option to control how new structural elements are applied to the already existing, deformed structure in the design states.

Starting position:
The new elements are applied with orientation to the initial position, that is, the provided geometry. The deformations are compensated throughout the construction process. Theoretically, there is a buckling in the geometry (Figure 02 1.)

Tangential:
The new elements are applied with the orientation of already deformed elements that are already existing, that is, tangent to them. Deformations are not compensated during the construction process. Theoretically, there is no buckling in the geometry (Figure 02 2.)

• ### According to which theory, the temporary loads and the created combinations are calculated in RF-STAGES or STAGES.

In RF-STAGES, the temporary loads in the respective construction stages are calculated only linearly, according to the linear static analysis. The permanent loads that are embossed into the system become nonlinear, according to Theorie III. Order, calculated. In the combinations that can be created in the add-on module, the results of the individual load cases are combined.
• ### Can I calculate or measure composite cross-sections with RFEM concrete-concrete?

An illustration of a concrete-concrete composite section is currently not possible. For this purpose, the construction condition calculation must be coupled with the cross-section solver of the concrete design. We are currently working on this in future versions.
• ### In the RF‑STAGES module, I get a message about instability. RFEM calculates the model without any problems. How can I solve this?

Basically, you should pay attention to the following points:

###### Entering Model

The structure in RF‑STAGES and RFEM may differ due to the definition in RF‑STAGES. Therefore, the structure in RF-STAGES may be different than in RFEM. In order to find the instability at a certain construction stage, it is necessary to model the structure in this construction stage in RFEM and take it into account separately. In this context, it should also be noted that the entries are not synchronized between RFEM and RF-STAGES. For example, a member end release removed in RFEM is not automatically removed in the RF-STAGES model.

###### Method of Analysis

RF-STAGES calculates permanent load cases according to the large deformation analysis. As a result of this analysis, instabilities may occur which are not present in a load case when calculating according to the linear static analysis (critical load problems), for example.

###### Special Structural Elements

Some of the structural elements available in RFEM are not supported in RF‑STAGES. These structural elements can also cause the instability in certain cases. The following structural elements are not fully supported in RF‑STAGES:

• Line hinges
• Member elastic foundations
• Sets of members
• Intersections
• Nodal releases
• Line releases
• Surface releases
• Nodal constraints

If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

#### First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

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